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Ferromagnetic quantum critical endpoint in UCoAl

UCoAlにおける強磁性量子臨界終点

青木 大*; Combier, T.*; Taufour, V.*; 松田 達磨; Knebel, G.*; 小手川 恒*; Flouquet, J.*

Aoki, Dai*; Combier, T.*; Taufour, V.*; Matsuda, Tatsuma; Knebel, G.*; Kotegawa, Hisashi*; Flouquet, J.*

Resistivity and magnetostriction measurements were performed at high magnetic fields and under pressure on UCoAl. At ambient pressure, the 1st order metamagnetic transition at $$H$$$$rm_m$$ $$sim$$ 0.7T from the paramagnetic ground state to the field-induced ferromagnetic state changes to a crossover at finite temperature $$T$$$$rm_0$$ $$sim$$ 11K. With increasing pressure, $$H$$$$rm_m$$ linearly increases, while $$T$$$$rm_0$$ decreases and is suppressed at the quantum critical endpoint (QCEP). We compare our results on UCoAl with those of UGe$$_2$$ and Sr$$_3$$Ru$$_2$$O$$_7$$.

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パーセンタイル:7.99

分野:Physics, Multidisciplinary

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