Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Correlated Electrons: Quantum-Critical Phenomena - Experiments
TT 59.3: Vortrag
Donnerstag, 14. März 2013, 15:30–15:45, H6
Ferromagnetic Quantum Critical Point in YbNi4(P1−xAsx)2 — •Cornelius Krellner1,2, Alexander Steppke2, Robert Küchler2, Stefan Lausberg2, Edit Lengyel2, Lucia Steinke2, Robert Borth2, Thomas Lühmann2, Michael Nicklas2, Sven Friedemann3, Christoph Geibel2, Frank Steglich2, and Manuel Brando2 — 1Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Cavendish Laboratory, University of Cambridge, United Kingdom
YbNi4P2 is a quasi-one-dimensional heavy-fermion system where recently a very low lying ferromagnetic (FM) transition at TC=0.17 K was observed [1]. Above this transition distinct deviations from the predictions of the Landau-Fermi-liquid theory were observed, indicating the presence of a nearby FM quantum critical point (QCP).
In this contribution, we present a thorough investigation of YbNi4(P1−xAsx)2 single crystals where the ferromagnetism is further suppresed. We show that the FM phase transition line remains second order down to 30 mK for x ≤ 0.08 with unexpected power-laws above TC in all thermodynamic quantities. At x=0.08, we found a power-law divergence of the Grüneisen ratio, demonstrating the existence of a FM QCP.
[1] C. Krellner et al., New J. Phys. 13, 103014 (2011).