Quantum critical point scenarios in heavy-fermion systems

• Applicants: Professor Dr. Philipp Gegenwart; Professor Dr. Frank Steglich
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2007 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 48554140

Final Report Abstract

No abstract available

Publications

• Quantum criticality in heavy-fermion metals, Nature Phys. 4, 186 (2008)
  P. Gegenwart, Q. Si, and F. Steglich
  (See online at https://doi.org/10.1038/nphys892)
• Detaching the antiferromagnetic quantum critical point from the Fermi surface reconstruction in YbRh2Si2, Nature Phys. 5, 465 (2009)
  S. Friedemann, T. Westerkamp, M. Brando, N. Oeschler, S. Wirth, P. Gegenwart, C. Krellner, C. Geibel, and F. Steglich
  (See online at https://doi.org/10.1038/nphys1299)
• Divergence of the Magnetic Grueneisen Ratio at the Field-Induced Quantum Critical Point in YbRh2Si2, Phys. Rev. Lett. 102, 066401 (2009)
  Y. Tokiwa, T. Radu, C. Geibel, F. Steglich, and P. Gegenwart
  (See online at https://doi.org/10.1103/PhysRevLett.102.066401)
• Avoided Ferromagnetic Quantum Critical Point: Unusual Short- Range Ordered State in CeFePO, Phys. Rev. Lett. 109, 216402 (2012)
  S. Lausberg, J. Spehling, A. Steppke, A. Jesche, H. Luetkens, A. Amato, C. Baines, C. Krellner, M. Brando, C. Geibel, H. H. Klauss, and F. Steglich
  (See online at https://doi.org/10.1103/PhysRevLett.109.216402)
• Thermal and electrical transport across a magnetic quantum critical point, Nature 484, 493 (2012)
  H. Pfau, S. Hartmann, U. Stockert, P. Sun, S. Lausberg, M. Brando, S. Friedemann, C. Krellner, C. Geibel, S. Wirth, S. Kirchner, E. Abrahams, Q. Si, and F. Steglich
  (See online at https://doi.org/10.1038/nature11072)
• Anomalous Reduction of the Lorenz Ratio at the Quantum Critical Point in YbAgGe, Phys. Rev. Lett. 110, 176402 (2013)
  J. K. Dong, Y. Tokiwa, S. L. Bud'ko, P. C. Canfield, and P. Gegenwart
  (See online at https://doi.org/10.1103/PhysRevLett.110.176402)
• Ferromagnetic Quantum Critical Point in the Heavy-Fermion Metal YbNi4(P1-xAsx)2, Science 339, 933 (2013)
  A. Steppke, R. Kuechler, S. Lausberg, E. Lengyel, L. Steinke, R. Borth, T. Luehmann, C. Krellner, M. Nicklas, C. Geibel, F. Steglich and M. Brando
  (See online at https://doi.org/10.1126/science.1230583)
• Interplay between Kondo Suppression and Lifshitz Transitions in YbRh2Si2 at High Magnetic Fields, Phys. Rev. Lett. 110, 256403 (2013)
  H. Pfau, R. Daou, S. Lausberg, H. R. Naren, M. Brando, S. Friedemann, S. Wirth, T. Westerkamp, U. Stockert, P. Gegenwart, C. Krellner, C. Geibel, G. Zwicknagl, and F. Steglich
  (See online at https://doi.org/10.1103/PhysRevLett.110.256403)
• Quantum Bicriticality in the Heavy- Fermion Metamagnet YbAgGe, Phys. Rev. Lett. 111, 116401 (2013)
  Y. Tokiwa, M. Garst, P. Gegenwart, S. L. Bud'ko, and P. C. Canfield
  (See online at https://doi.org/10.1103/PhysRevLett.111.116401)
• Quantum criticality in a metallic spin liquid, Nature Mat. 13, 356 (2014)
  Y. Tokiwa, J. J. Ishikawa, S. Nakatsuji, and P. Gegenwart
  (See online at https://doi.org/10.1038/nmat3900)