Bio


Since 2021 Researcher, Stanford University
Research project: Angle resolved photoemission spectroscopy under strain

2019-2020: Postdoctoral Researcher, Lawrence Berkeley National Laboratory (LBNL), USA
Research project: Angle resolved photoemission spectroscopy under strain

2015-2018: Postdoctoral Researcher, Stanford University and SLAC National Accelerator Laboratory, USA
Research project: Angle resolved photoemission spectroscopy on iron-based superconductors and heavy fermion systems

2015: PhD in Physics, Technical University Dresden, Germany
Title: Thermal Transport in Strongly Correlated Rare Earth Intermetallic Compounds

2010 - 2015: Reseach Assistant, Max-Planck Institute for Chemical Physics of Solids Dresden, Germany
Research projects: Low temperature thermal transport in heavy fermion systems and skutterudites;
study of Kondo effect, Lifshitz transitions, quantum criticality, and superconductivity

Academic Appointments


Honors & Awards


  • DFG Fellowship, German Science Foundation (DFG) (2018)
  • Feodor Lynen Fellowship, Alexander-von-Humboldt Foundation (2015)
  • Springer Theses Award, Springer publishing group (2016)
  • Otto-Hahn Medal, Max Planck Society (2016)

All Publications


  • Quantum-well states in fractured crystals of the heavy-fermion material CeCoIn5 PHYSICAL REVIEW B Gauthier, N., Sobota, J. A., Hashimoto, M., Pfau, H., Lu, D., Bauer, E. D., Ronning, F., Kirchmann, P. S., Shen, Z. 2020; 102 (12)
  • Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals JOURNAL OF APPLIED PHYSICS Gauthier, A., Sobota, J. A., Gauthier, N., Xu, K., Pfau, H., Rotundu, C. R., Shen, Z., Kirchmann, P. S. 2020; 128 (9)

    View details for DOI 10.1063/5.0018834

    View details for Web of Science ID 000567597300001

  • Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu2Si2 versus YbRh2Si2 PHILOSOPHICAL MAGAZINE Smidman, M., Stockert, O., Arndt, J., Pang, G. M., Jiao, L., Yuan, H. Q., Vieyra, H. A., Kitagawa, S., Ishida, K., Fujiwara, K., Kobayashi, T. C., Schuberth, E., Tippmann, M., Steinke, L., Lausberg, S., Steppke, A., Brando, M., Pfau, H., Stockert, U., Sun, P., Friedemann, S., Wirth, S., Krellner, C., Kirchner, S., Nica, E. M., Yu, R., Si, Q., Steglich, F. 2018; 98 (32): 2930–63
  • Dehybridization of f and d states in the heavy-fermion system YbRh2Si2 PHYSICAL REVIEW B Leuenberger, D., Sobota, J. A., Yang, S., Pfau, H., Kim, D., Mo, S., Fisk, Z., Kirchmann, P. S., Shen, Z. 2018; 97 (16)
  • Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material YbNi4P2 Physical Review Letters Pfau, H., Daou, R., Friedemann, S., Karbassi, S., Ghannadzadeh, S., Kuechler, R., Hamann, S., Steppke, A., Sun, D., Koenig, M., Mackenzie, A., Kliemt, K., Krellner, C., Brando, M. 2017; 119
  • Superconducting gap structure of the skutterudite LaPt4Ge12 probed by specific heat and thermal transport PHYSICAL REVIEW B Pfau, H., Nicklas, M., STOCKERT, U., Gumeniuk, R., Schnelle, W., Leithe-Jasper, A., Grin, Y., STEGLICH, F. 2016; 94 (5)
  • Evidence of a Kondo Destroying Quantum Critical Point in YbRh2Si2 JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Steglich, F., Pfau, H., Lausberg, S., Hamann, S., Sun, P., Stockert, U., Brando, M., Friedemann, S., Krellner, C., Geibel, C., Wirth, S., Kirchner, S., Abrahams, E., Si, Q. 2014; 83 (6)
  • Heavy fermion and Kondo lattice behavior in the itinerant ferromagnet CeCrGe3 JOURNAL OF PHYSICS-CONDENSED MATTER Das, D., Gruner, T., PFAU, H., Paramanik, U. B., Burkhardt, U., Geibel, C., Hossain, Z. 2014; 26 (10)

    Abstract

    Physical properties of polycrystalline CeCrGe3 and LaCrGe3 have been investigated by x-ray absorption spectroscopy, magnetic susceptibility χ(T), isothermal magnetization M(H), electrical resistivity ρ(T), specific heat C(T) and thermoelectric power S(T) measurements. These compounds are found to crystallize in the hexagonal perovskite structure (space group P63/mmc), as previously reported. The ρ(T), χ(T) and C(T) data confirm the bulk ferromagnetic ordering of itinerant Cr moments in LaCrGe3 and CeCrGe3 with TC = 90 K and 70 K respectively. In addition, a weak anomaly is also observed near 3 K in the C(T) data of CeCrGe3. The T dependences of ρ and finite values of Sommerfeld coefficient γ obtained from the specific heat measurements confirm that both the compounds are of metallic character. Further, the T dependence of ρ of CeCrGe3 reflects a Kondo lattice behavior. An enhanced γ of 130 mJ mol(-1) K(-2) together with the Kondo lattice behavior inferred from the ρ(T) establish CeCrGe3 as a moderate heavy fermion compound with a quasi-particle mass renormalization factor of ∼45.

    View details for DOI 10.1088/0953-8984/26/10/106001

    View details for Web of Science ID 000332377400015

    View details for PubMedID 24553355

  • Interplay between Kondo Suppression and Lifshitz Transitions in YbRh2Si2 at High Magnetic Fields PHYSICAL REVIEW LETTERS Pfau, H., Daou, R., Lausberg, S., Naren, H. R., Brando, M., Friedemann, S., Wirth, S., Westerkamp, T., STOCKERT, U., Gegenwart, P., Krellner, C., Geibel, C., Zwicknagl, G., STEGLICH, F. 2013; 110 (25)

    Abstract

    We investigate the magnetic field dependent thermopower, thermal conductivity, resistivity, and Hall effect in the heavy fermion metal YbRh2Si2. In contrast to reports on thermodynamic measurements, we find in total three transitions at high fields, rather than a single one at 10 T. Using the Mott formula together with renormalized band calculations, we identify Lifshitz transitions as their origin. The predictions of the calculations show that all experimental results rely on an interplay of a smooth suppression of the Kondo effect and the spin splitting of the flat hybridized bands.

    View details for DOI 10.1103/PhysRevLett.110.256403

    View details for Web of Science ID 000320761800004

    View details for PubMedID 23829750

  • Influence of Ir and La substitution on the thermal transport properties of YbRh2Si2 PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS Stockert, U., Pfau, H., Hartmann, S., Lausberg, S., Friedemann, S., Krellner, C., Wirth, S., Geibel, C., Steglich, F. 2013; 250 (3): 491-494
  • Thermal and electrical transport across a magnetic quantum critical point NATURE Pfau, H., Hartmann, S., Stockert, U., Sun, P., Lausberg, S., Brando, M., Friedemann, S., Krellner, C., Geibel, C., Wirth, S., Kirchner, S., Abrahams, E., Si, Q., Steglich, F. 2012; 484 (7395): 493-497

    Abstract

    A quantum critical point (QCP) arises when a continuous transition between competing phases occurs at zero temperature. Collective excitations at magnetic QCPs give rise to metallic properties that strongly deviate from the expectations of Landau's Fermi-liquid description, which is the standard theory of electron correlations in metals. Central to this theory is the notion of quasiparticles, electronic excitations that possess the quantum numbers of the non-interacting electrons. Here we report measurements of thermal and electrical transport across the field-induced magnetic QCP in the heavy-fermion compound YbRh(2)Si(2) (refs 2, 3). We show that the ratio of the thermal to electrical conductivities at the zero-temperature limit obeys the Wiedemann-Franz law for magnetic fields above the critical field at which the QCP is attained. This is also expected for magnetic fields below the critical field, where weak antiferromagnetic order and a Fermi-liquid phase form below 0.07 K (at zero field). At the critical field, however, the low-temperature electrical conductivity exceeds the thermal conductivity by about 10 per cent, suggestive of a non-Fermi-liquid ground state. This apparent violation of the Wiedemann-Franz law provides evidence for an unconventional type of QCP at which the fundamental concept of Landau quasiparticles no longer holds. These results imply that Landau quasiparticles break up, and that the origin of this disintegration is inelastic scattering associated with electronic quantum critical fluctuations--these insights could be relevant to understanding other deviations from Fermi-liquid behaviour frequently observed in various classes of correlated materials.

    View details for DOI 10.1038/nature11072

    View details for Web of Science ID 000303200400046

    View details for PubMedID 22538612

  • Thermoelectric transport across the metamagnetic transition of CeRu2Si2 PHYSICAL REVIEW B Pfau, H., Daou, R., Brando, M., Steglich, F. 2012; 85 (3)
  • Ferromagnetic quantum criticality in the quasi-one-dimensional heavy fermion metal YbNi4P2 NEW JOURNAL OF PHYSICS Krellner, C., Lausberg, S., Steppke, A., Brando, M., Pedrero, L., PFAU, H., Tence, S., Rosner, H., STEGLICH, F., Geibel, C. 2011; 13