Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-07-22
J. Phys. Soc. Jpn. 80 (2011) 094711
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 14 figures, accepted for publication in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.80.094711
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 UGe2 and the itinerant metamagnetic ruthenate Sr3Ru2O7.
Aoki Dai
Combier Tristan
Flouquet Jacques
Knebel Georg
Kotegawa Hisashi
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