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TT: Fachverband Tiefe Temperaturen

TT 50: Quantum-Critical Phenomena I

TT 50.5: Vortrag

Mittwoch, 14. März 2018, 10:30–10:45, H 3005

Fermi surface studies of YbNi₄P₂ — •Sven Friedemann¹, Alix McCollam², Gertrud Zwicknagl³, Kristin Kliemt⁴, and Cornelius Krellner⁴ — ¹HH Wills Laboratory, University of Bristol, UK — ²High Field Magnet Laboratory, University of Radboud, Nijmegen, NL — ³Institut für Mathematische Physik, TU Braunschweig, Braunschweig, Germany — ⁴Physikalisches Institut, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany

YbNi₄P₂ is a rare example of a heavy-fermion compound with ferromagnetic (FM) order. Moreover, FM order can be suppressed and a FM quantum critical point (QCP) can be accessed if phosphorous is partially substituted by arsenic [1]. The presence of a FM QCP makes YbNi₄P₂ unique as FM QCPs are avoided in most systems through a change of the transition to 1st order or through an intervening antiferromagnetic phase. The preservation of the FM QCP is theoretically suggested to be due to an effective one-dimensional electronic structure. Here, we present quantum oscillation measurements performed at high magnetic fields and low temperatures. We compare the angular dependency of the observed frequencies with predictions from band structure calculations treating the f electrons as core electrons and with predictions from fully renormalised band structure calculations.
A. Steppke et al., Science, 339, 933 (2013).