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Associate Professor

Clemens Ulrich

[p]: 

+61(2) 9385 7494

[f]: 

+61(2) 9385 6060

Education: 

  • since 2009 Associate Professor in the School of Physics, UNSW
  • 1999 - 2009 Group Leader, Max-Planck Institute for Solid State Research, Stuttgart, Germany (Prof. B. Keimer).
  • 1998 - 1999 Postdoctoral Research Associate, Bell-Labs and NIST, U.S.A. (Prof. A.P. Ramirez, Prof. C. Broholm).
  • 1994 - 1997 Ph.D. Max-Planck Institute for Solid State Research, Stuttgart, Germany (Prof. M. Cardona).
  • 1993 - 1994 Diploma in Physics (M.Sc). University of Ulm, Germany (Prof. Sauer).

 

 

Research Interests: 

 

The main topic of the research of A/Prof. Clemens Ulrich is optical spectroscopy, neutron scattering, and X-ray synchrotron scattering on systems with strongly correlated electrons, in particular transition metal oxides such as multiferroics or unconventional superconductors. Of special interest are effects of spin, charge, and orbital correlations in 3-dimensional perovskites with partly occupied 3d-electronic levels. The combination of the complementary techniques, in particular Raman light scattering and inelastic neutron scattering on the same samples opens new perspectives in the determination of the quantum mechanical processes which result in the fascinating phenomena arising from strong electronic correlations.

Among my current research projects is the investigation of novel multifunctional materials based on transition metal oxides, i.e. multiferroics (TbMnO3, RMn2O5 with R = Tb, Ho, Y, and BiFeO3). In addition to Raman light scattering, neutron diffraction as well as inelastic neutron scattering experiments are performed on single crystal and PLD grown thin film samples. For example, the influence of oxygen isotope substitution on the magnetic properties was investigated in order to shine light on the mechanism of the magnetoelectric coupling. This project was supported through the ARC (grant DP110105346, $420k). Co-funding of ANSTO allowed us to employ two postdoctoral research fellows.

Atomically precise thin film systems of transition metal oxides offer novel functionalities and the possibility to investigate fundamental effects such as the interplay between magnetism and superconductivity on artificially grown materials, which are not accessible in nature. For example, in a combined polarized neutron and X-ray synchrotron reflectometry approach we have investigated the magnetic and stoichiometric depth profile in BiFeO3/LaSrMnO3 heterostructures with Angstr¨om resolution [Phys. Rev. B. Rapid Com. 90, 041113(R) (2014)]. Neutron diffraction experiments on PLD grown SrCoO3 films did verify a theoretically predicted but hitherto unobserved strain induced magnetic phase transition (submitted to Phys. Rev B, Rapid Com.). Experiments on superconducting/ferromagnetic thin film and superlattices by polarized neutron reflection, diffraction, and Raman light scattering will continue our investigations of the interplay between magnetism and superconductivity (see [Nature Materials 11, 675 (2012)]).

In a further project organic superconductors based on -(BEDTTTF) are investigated by Raman light scattering. Of particular interest was the magnetic phase diagram above the superconducting dome. Here we were able to determine the energies of the pseudogaps directly and will, as next step, focus on the symmetry of the superconducting pair-breaking peak. This project is a collaboration with A/Prof. B. Powell from the University of Queensland.

Experimental Techniques Acessible in the Group of A/Prof. C. Ulrich

 

 

At the UNSW A/Prof. C. Ulrich has installed two state-of-the-art optical setups for Raman light scattering, photoluminescence, absorption, reflection and modulation spectroscopy. The successful ARC grant LE110100060 ($237.500) allowed for the installation of optical diamond anvil high pressure cells for a pressure range of up to 70 GPa and temperatures down to 1.4 K. Furthermore, ultrafast time-resolved optical spectroscopy will be established through our successful ARC research grant LE140100033 ”Ultrafast time-resolved optical spectroscopy for advanced multifunctional materials” ($317.5k).

Besides the optical laboratories A/Prof. C. Ulrich has established a laboratory for sample growth at the UNSW. The laboratory is equipped with two standard muffle furnaces and two tube furnaces for temperatures of up to 1700◦ C. The tube furnaces offer the possibility to apply ultraclean gas environments or vacuum for controlled post growth annealing of the samples. The successful ARC research grant LE140100033 ($317.5k) will allow for the installation of an optical four-mirror traveling solvent floating zone furnace.

At the new research reactor OPAL at ANSTO, A/Prof. C. Ulrich has building up the Neutron Laue Diffraction setup JOEY. The main purpose of this instrument is the test of sample quality and alignment of single crystals prior to an experiment on one of the high-flux instruments. The Neutron Laue Camera will be available for all neutron users at the Bragg Institute.

http://www.ansto.gov.au/ResearchHub/Bragg/Facilities/Instruments/Joey/

 

Honours, Awards and Memberships: 

 

  • Otto-Hahn Medaille (1997) of the Max Planck Society, Germany.
  • Editorial Board: ’Scientific Reports’, Nature Publishing Group.
  • Mentor for the German DAAD and the Alexander von Humboldt Foundation
  • Referee of various international journals such as ’Science’, ’Physical Review Letters’, beam-time proposals of several large scale neutron and synchrotron facilities, and for several national research funding agencies.
  • Conference organizer such as ”6th Workshop on Orbital Physics and Novel Phenomena in Transition Metal Oxides” at the Max-Planck-Institute for Solid State Research in Stuttgart, Germany, (reported in Nature Materials 6, 927 (2007)),
  • Co-organizers of the Wagga-Wagga conference, the ”Annual Condensed Matter and Materials Meeting”, in Feb. 2011,
  • Member of the program committee of 20th AIP (Australian Institute of Physics) conference in 2012,
  • Main Organizer of the Wagga-Wagga conference, the ”Annual Condensed Matter and Materials Meeting”, in Feb. 2017.

41st Annual Condensed Matter and Materials Meeting in 2017

http://www.wagga2017.unsw.edu.au

 

Selected Publications: 

 

A/Prof. C. Ulrich has in total 80 peer-reviewed publications and conference contributions, among them 14 ’Physical Review Letters’, 7 as first author (impact factor: 7.645), 1 article in ’Science’ (impact factor: 34.661), 1 article in ’Nature Materials’ (impact factor 38.891) and 1 article in Nature Communications (impact factor 11.329). His publications were cited more than 2100 times (average citation per publication 26.29) and his Hirsch index is h = 26 according to the ’web of knowledge’.

2017

  • J. N. Narayanan, P.J. Graham, N. Reynolds, F. Li, P. Rovillain, J. Hester, J. Kimpton, M. Yethiraj, G.J. McIntyre, W.D. Hutchison, and C. Ulrich,
    The effect of 18O isotope substitution on the magnetic properties of multiferroic DyMnO3,
    Phys. Rev. B 95, 075154 (2017),
    DOI: 10.1103/PhysRevB.95.075154, journal impact factor: 3.718.

2016

  • J. Bertinshaw, R. Maran, S. J. Callori, V. Ramesh, J. Cheung, S. Dankilin, S. Hu, J. Seidel, N. Valanoor, and C. Ulrich,
    Direct evidence for the spin cycloid in strained nanoscale bismuth ferrite thin films,
    Nature Communications 7, 12664 (2016), DOI: 10.1038/ncomms12664, journal impact factor: 11.329.
  • N. Faraji, C. Ulrich, Y. K. Mishra, R. Adelung, and J. Seidel,
    Photoconductivity via nanoscale grain boundaries in self-supported two dimensional macroscopic ZnO platelets,
    Advanced Electronic Materials, 1600138 (2016),
    DOI: 10.1002/aelm.201600138
  • M. Reehuis, C. Ulrich, P.M. Abdala, P. Pattison, J. Fujioka, S. Miyasaka, Y. Tokura, and B. Keimer,
    Spin and orbital disorder in the hole-doped system Pr1-xCaxVO3,
    Phys. Rev. B 94, 104436 (2016), DOI:
    10.1103/PhysRevB.94.104436, journal impact factor: 3.718.
     

2015

  • C. Ulrich, G. Khaliullin, M. Reehuis, M. Guennou, H. Roth, T. Lorenz, and B. Keimer,
    Direct Evidence for a Spin-Orbit Continuum in LaTiO3 revealed by Raman Light Scattering,
    Phys. Rev. Lett. 115, 156403 (2015),
    DOI: 10.1103/PhysRevLett.115.156403,
    journal impact factor: 7.645.
  • S. J. Callori, S. Hu, J. Bertinshaw, Z. Yue, S. Danilkin, X.L. Wang, V. Nagarajan, F. Klose, J. Seidel, and C. Ulrich,
    Strain-induced magnetic phase transition in SrCoO3-δ thin films,

    Phys. Rev. B Rapid Com. 91, 140405(R) (2015),
    DOI: 10.1103/PhysRevB.91.140405,
    journal impact factor: 5.1.
  • S. Hu, Z. Yue, J. S. Lim, S. J. Callori, J. Bertinshaw, A. Ikeda-Ohno, T. Ohkochi, C.-H. Yang, X. L. Wang, V. Nagarajan, C. Ulrich, and J. Seidel,
    Growth and Properties of Strained Epitaxial SrCoOx (x ≈ 2.8) Thin Films on DyScO3,
    Advanced Materials Interfaces, 1500012 (2015), DOI: 10.1002/admi.201500012.
     

2014

  • J.-H. Kim, Anil Jain, M. Reehuis, G. Khaliullin, D.C. Peets, C. Ulrich, J.T. Park, E. Faulhaber, A. Hoser, H.C.Walker, D.T. Adroja, A.C.Walters, D.S. Inosov, A. Maljuk, and B. Keimer,
    Competing Exchange Interactions on the Verge of a Metal-Insulator Transition in the Two-Dimensional Spiral Magnet Sr3Fe2O7,
    Phys. Rev. Lett. 113, 147206 (2014), DOI:
    10.1103/PhysRevLett.113.147206, journal impact factor: 7.645.
  • Joel Bertinshaw, C. Ulrich, A.Günther, F. Schrettle, M. Wohlauer, S. Krohns, M. Reehuis, A.J. Studer, M. Avdeev, D.V. Quach, J.R. Groza, V. Tsurkan, A. Loidl, and J. Deisenhofer,
    FeCr2S4 in magnetic fields: possible evidence for a multiferroic ground state,
    Scientific Reports 4, 6079 (2014), DOI:
    10.1038/srep06079, journal impact factor: 5.228.
  • Joel Bertinshaw, S. Brück, D. Lott, H. Fritzsche, Y. Khaydukov, O. Soltwedel, T. Keller, E. Goering, P. Audehm, D.L. Cortie, W.D. Hutchison, Q. M. Ramasse, M. Arredondo, R. Maran, N. Valanoor, F. Klose, and C. Ulrich,
    Element-Specific Depth Profile of the Magnetism and Stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 Interface,
    Phys. Rev. B Rapid Com. 90, 041113(R) (2014),
    DOI: 10.1103/PhysRevB.90.041113, journal impact factor: 3.718.
  • Matthias Schrade, Simone Casolo, Paul Graham, Clemens Ulrich, Sean Li, Ole-Martin Lovvik, Terje G. Finstad, and Truls Norby,
    Oxygen Nonstoichiometry in (Ca2CoO3)0.62(CoO2): A Combined Experimental and Computational Study,
    J. Phys. Chem. C 118, 18899 (2014), DOI:
    10.1021/jp5048437, journal impact factor: 4.509.
  • Joel Bertinshaw, D.L. Cortie, Z.X. Cheng, M. Avdeev, A.J. Studer, F. Klose, C. Ulrich, and X.L. Wang,
    Spin-cycloid instability as the origin of weak-ferromagnetism in the disordered perovskite Bi0.8La0.2Fe0.5Mn0.5O3,
    Phys. Rev. B. 89, 144422 (2014), DOI:
    10.1103/PhysRevB.89.144422, journal impact factor: 3.718.

2013

  • D. C. Peets, J.-H. Kim, P. Dosanjh, M. Reehuis, A. Maljuk, N. Aliouane, C. Ulrich, and B. Keimer,
    Magnetic phase diagram of Sr3Fe2O7-δ,
    Phys. Rev. B 87, 214410 (2013), DOI:
    10.1103/PhysRevB.87.214410, journal impact factor: 3.718.

2012

  • N. Driza, S. Blanco-Canosa, M. Bakr, S. Soltan, M. Khalid, L. Mustafa, K. Kawashima, G. Christiani, H.-U. Habermeier, G. Khaliullin, C. Ulrich, M. Le Tacon, and B. Keimer,
    Long-range transfer of electron-phonon coupling in oxide superlattices,
    Nature Materials 11, 675 (2012), DOI:
    10.1038/nmat3378, journal impact factor: 38.891.
  • M. Reehuis, C. Ulrich, A. Maljuk, Ch. Niedermayer, D. Cheptiakov, B. Ouladdiaf, A. Hoser, T. Hofmann, and B. Keimer,
    Neutron diffraction study of spin and charge ordering in SrFeO3-δ,
    Phys. Rev. B 85, 184109 (2012), DOI:
    10.1103/PhysRevB.85.184109, journal impact factor: 3.718.
  • Ping-Han Tsai, Mohammad H.N. Assadi, Tianshu Zhang, Clemens Ulrich, Thiam Teck Tan, Richard Donelson, and Sean Li,
    Immobilization of Na Ions for Substantial Power Factor Enhancement: Site-Specific Defect Engineering in Na0.8CoO2,
    J. Phys. Chem. C 116, 4324 (2012), DOI:
    10.1021/jp209343v, journal impact factor: 4.509.

2011

  • M. Raichle, D. Reznik, D. Lamago, R. Heid, Y. Li, M. Bakr, C. Ulrich, V. Hinkov, K. Hradil, C.T. Lin, and B. Keimer,Highly Anisotropic Anomaly in the Disperson of the Cooper-Oxygen Bond-Bending Phonon in Superconducting YBa2Cu3O7 from Inelastic Neutron Scattering,Phys. Rev. Lett. 107, 177004 (2011), DOI: 10.1103/PhysRevLett.107.177004, journal impact factor: 7.645.
  • M. Reehuis, C. Ulrich, K. Prokes, S. Matas, J. Fujioka, S. Miyasaka, Y. Tokura, and B. Keimer, Structural and magnetic phase transitions of the orthovanadates RVO3 (R = Dy, Ho, Er) as seen via neutron diffraction,Phys. Rev. B 83, 064404 (2011), DOI:  10.1103/PhysRevB.83.064404, journal impact factor: 3.718.

2010

  • M. Rahlenbeck, M. Wagenknecht, A. Tsukada, D. Koelle, R. Kleiner, B. Keimer, and C. Ulrich, Raman light scattering study and microstructural analysis of epitaxial films of the electrondoped superconductor La2-xCexCuO4, European Physical Journal B 75, 461 (2010), DOI:10.1140/epjb/e2010-00166-6, journal impact factor: 1.223.

2009

  • C. Ulrich, L.J.P. Ament, G. Ghiringhelli, L. Braicovitch, M. Moretti-Sala, N. Pezzotta, T. Schmitt, G. Khaliullin, J. van den Brink, H. Roth, T. Lorenz, and B. Keimer, Momentum Dependence of Orbital Excitations in Mott-Insulating Titanates, Phys. Rev. Lett. 103. 107205 (2009), DOI: 10.1103/PhysRevLett.103.107205, journal impact factor: 7.645.
  • M. Bakr, A.P. Schnyder, L. Klam, D. Manske, C.T. Lin, B. Keimer, M. Cardona, and C. Ulrich, Electronic and phononic Raman scattering in detwinned YBa2Cu3O6.95 and Y0.85Ca0.15Ba2Cu3O6.95: s-wave admixture to the dx2-y2-wave order parameter, Phys. Rev. B 80, 064505 (2009), DOI: 10.1103/PhysRevB.80.064505, journal impact factor: 3.718.
  • M. Rahlenbeck, G.L. Sun, D.L. Sun, C.T. Lin, B. Keimer, and C. Ulrich, Phonon anomalies in pure and underdoped R1-xKxFe2As2 (R = Ba, Sr) investigated by Raman light scattering, Phys. Rev. B 80, 064509 (2009), DOI: 10.1103/PhysRevB.80.064509, journal impact factor: 3.718.

Selected Publications: 2008 - 1997

  • C. Ulrich, G. Ghiringhelli, A. Piazzagalli, L. Braicovich, N.B. Brookes, H. Roth, T. Lorenz, and B. Keimer, Orbital excitations in YTiO3and LaTiO3probed by resonant inelastic soft  x–ray scattering, Phys. Rev. B 77, 113102 (2008), DOI: 10.1103/PhysRevB.77.113102, journal impact factor: 3.718.
  • C. Ulrich, A. Gössling, M. Grüninger, M. Guennou, H. Roth, M. Cwik, T. Lorenz, G. Khaliullin, and B. Keimer, Raman Scattering in the Mott Insulators LaTiO3 and YTiO3: Evidence for Orbital Excitations, Phys. Rev. Lett. 97, 157401 (2006), DOI: 10.1103/PhysRevLett.97.157401, journal impact factor 7.645.
  • S. Pailhés, C. Ulrich, B. Fauqué, V. Hinkov, Y. Sidis, A. Ivanov, C. T. Lin, B. Keimer, and P. Bourges, Doping Dependence of Bilayer Resonant Spin Excitations in (Y,Ca)Ba2Cu3O6+x, Phys. Rev. Lett. 96, 257001 (2006), DOI: 10.1103/PhysRevLett.96.257001, journal impact factor 7.645.
  • S. Pailhés, Y. Sidis, P. Bourges, V. Hinkov, A. Ivanov, C. Ulrich, L. P. Regnault, and B. Keimer, Resonant Magnetic Excitations at High Energy in Superconducting YBa2Cu3O6.85, Phys. Rev. Lett. 93, 167001 (2004), DOI: 10.1103/PhysRevLett.93.167001, journal impact factor: 7.645.
  • A. Lebon, P. Adler, C. Bernhard, A. V. Boris, A. V. Pimenov, A. Maljuk, C.T. Lin, C. Ulrich, and B. Keimer, Magnetism, Charge Ordering, and Giant Magnetoresistance in SrFeO3-dSingle Crystals, Phys. Rev. Lett. 92, 037202 (2004),DOI:10.1103/PhysRevLett.92.037202, journal impact factor: 7.645.
  • S. Pailhés, Y. Sidis, P. Bourges, C. Ulrich, V. Hinkov, L. P. Regnault, A. Ivanov, B. Liang, C.T. Lin, C. Bernhard, and B. Keimer, Two resonant magnetic modes in an overdoped high Tc superconductor, Phys. Rev. Lett. 91, 237002 (2003),DOI: 10.1103/PhysRevLett.91.237002, journal impact factor: 7.645.
  • C. Ulrich, G. Khaliullin, J. Sirker, M. Reehuis, M. Ohl, S. Miyasaka, Y. Tokura, and B. Keimer, Magnetic neutron scattering study of YVO3: Evidence for an orbital Peierls state, Phys. Rev. Lett. 91, 257202 (2003). DOI: 10.1103/PhysRevLett.91.257202, journal impact factor 7.645.
  • C. Ulrich, G. Khaliullin, S. Okamoto, M. Reehuis, A. Ivanov, H. He, Y. Taguchi, Y. Tokura, and B. Keimer, Magnetic order and dynamics in an orbitally degenerate ferromagnetic insulator, Phys. Rev. Lett. 89, 167202 (2002). DOI: 10.1103/PhysRevLett.89.167202, journal impact factor 7.645.
  • H. He, P. Bourges, Y. Sidis, C. Ulrich, L. P. Regnault, S. Pailhés, N. S. Berzigiarova, N. N. Kolesnikov, and B. Keimer, Magnetic resonant mode in the single-layer high-temperature superconductor Tl2Ba2CuO6+δ, Science 295, 1045 (2002). DOI: 10.1126/science.1067877, journal impact factor 34.661.
  • Y. Sidis, C. Ulrich, P. Bourges, C. Bernhard, C. Niedermayer, L.P. Regnault, N. H. Andersen, and B. Keimer, Antiferromagnetic ordering in superconducting YBa2Cu3O6.5, Phys. Rev. Lett. 86, 4100 (2001), DOI: 10.1103/PhysRevLett.86.4100, journal impact factor 7.645.
  • J.W. Lynn, B. Keimer, C. Ulrich, C. Bernhard, and J. L. Tallon, Antiferromagnetic ordering of Ru and Gd in superconducting RuSr2GdCu2O8, Phys. Rev. B Rapid Com. 61, R14964 (2000), DOI: 10.1103/PhysRevB.61.R14964,  journal impact factor 3.718.
  • C. Ulrich, A. Göbel, K. Syassen, and M. Cardona, Pressure-induced disappearance of the Raman anomaly in CuCl, Phys. Rev. Lett. 82, 351 (1999), DOI: 10.1103/PhysRevLett.82.351,journal impact factor: 7.645.
  • C. Ulrich, E. Anastassakis, K. Syassen, A. Debernardi, and M. Cardona, Lifetime of phonons in semiconductors under pressure, Phys. Rev. Lett. 78, 1283 (1997),DOI: 10.1103/PhysRevLett.78.1283, journal impact factor: 7.645.