Ferromagnetic Quantum Critical Endpoint in UCoAl

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Dai Aoki¹, Tristan Combier¹, Valentin Taufour¹, Tatsuma D. Matsuda¹^,², Georg Knebel¹, Hisashi Kotegawa¹^,³, and Jacques Flouquet¹

+ Affiliations

¹INAC/SPSMS, CEA-Grenoble, 38054 Grenoble, France²ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan³Department of Physics, Kobe University, Kobe 657-8501, Japan

Received June 15, 2011; Accepted July 21, 2011; Published August 25, 2011

Resistivity and magnetostriction measurements were performed at high magnetic fields and under pressure on UCoAl. At ambient pressure, the 1st order metamagnetic transition at H _m∼0.7 T from the paramagnetic ground state to the field-induced ferromagnetic state changes to a crossover at finite temperature T ₀∼11 K. With increasing pressure, H _m linearly increases, while T ₀ decreases and is suppressed at the quantum critical endpoint (QCEP, P _QCEP∼1.5 GPa, H _m∼7 T). At higher pressure, the value of H _m identified as a crossover continuously increases, while a new anomaly appears above P _QCEP at higher field H ^* in resistivity measurements. The field dependence of the effective mass ( m ^*) obtained by resistivity and specific heat measurements exhibits a step-like drop at H _m at ambient pressure. With increasing pressure, it gradually changes into a peak structure and a sharp enhancement of m ^* is observed near the QCEP. Above P _QCEP, the enhancement of m ^* is reduced, and a broad plateau is found between H _m and H ^*. We compare our results on UCoAl with those of the ferromagnetic superconductor UGe ₂ and the itinerant metamagnetic ruthenate Sr ₃Ru ₂O ₇.

https://doi.org/10.1143/JPSJ.80.094711

KEYWORDS: quantum critical endpoint, effective mass, metamagnetism, ferromagnetism, UCoAl, UGe₂

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Ferromagnetic Quantum Critical Endpoint in UCoAl

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