Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl
Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl
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DOI：
10.1103/physrevb.92.035106
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发表时间：
2015-07-02
影响因子：
3.7
通讯作者：
Satoh, I.
中科院分区：
文献类型：
--
作者：
Kimura, N.;Kabeya, N.;Satoh, I.
我们提出了通过交流磁化率测量确定的巡回电子超磁体 UCoAl 的温度-压力-磁场相图。发现量子临界点 (QCP) 位于 2.9 +/- 0.2 GPa（相当于 P-QCP）和 130 +/- 5 kOe。除了相图的确定之外，我们还报告了顺磁状态和相边界周围的磁性和输运特性。磁化率的临界发散向 QCP 方向受到抑制。从纵向磁阻和磁场下的电阻率来看，在所谓的超临界区域观察到电阻率的增强。在顺磁区域，磁阻和电阻率的温度依赖性表现出复杂的行为，特别是在 1.5 GPa 和 P-QCP 附近。
We present the temperature-pressure-magnetic-field phase diagram of the itinerant-electron metamagnet UCoAl determined from the ac susceptibility measurement. The quantum critical point (QCP) was found to be located at 2.9 +/- 0.2 GPa (equivalent to P-QCP) and 130 +/- 5 kOe. In addition to the determination of the phase diagram, we report magnetic and transport properties in the paramagnetic state and around the phase boundary. The critical divergence of the magnetic susceptibility is suppressed toward the QCP. From the longitudinal magnetoresistance and the resistivity under magnetic fields, enhancement of the resistivity is observed in the so-called supercritical region. In the paramagnetic region, the magnetoresistance and temperature dependence of the resistivity exhibit complex behaviors, especially in the vicinity of 1.5 GPa and P-QCP.