Pressure–Temperature Phase Diagram and Superconductivity in UIr
Pressure–Temperature Phase Diagram and Superconductivity in UIr
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DOI：
10.1143/jpsj.76.051007
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发表时间：
2007-05
影响因子：
1.7
通讯作者：
Tatsuo C. Kobayashi;A. Hori;Satoshi Fukushima;H. Hidaka;H. Kotegawa;T. Akazawa;K. Takeda;Y. Ohishi;E. Yamamoto
中科院分区：
文献类型：
--
作者：
Tatsuo C. Kobayashi;A. Hori;Satoshi Fukushima;H. Hidaka;H. Kotegawa;T. Akazawa;K. Takeda;Y. Ohishi;E. Yamamoto
在 UIr 中发现了压力引起的超导性，没有反演对称性。通过高压下的电阻率、交流磁化率和磁化强度测量来研究压力-温度相图。该相图由三个磁相 FM1-3 和一个超导相组成。在中压区发现残余电阻率和负磁阻的巨大增强。这些行为可能是由压力引起的结构相变和在此压力范围内伴随的相分离引起的。具有窄压力范围的超导相嵌入FM3相中，邻近零温FM3到非磁性的转变。 T SC 以上电阻率的温度依赖性遵循 T 1.6 的非费米液体形式。从这些实验事实来看，超导性被认为与铁磁涨落有关。
Pressure-induced superconductivity is found in UIr without inversion symmetry. The pressure–temperature phase diagram has been investigated by means of the electrical resistivity, ac-susceptibility and magnetization measurements under high pressure. The phase diagram consists of three magnetic phases FM1–3 and a superconducting phase. The huge enhancement of residual resistivity and the negative magnetoresistance are found in the intermediate pressure region. These behavior may be induced by the pressure-induced structural phase transition and the accompanied phase separation in this pressure range. The superconducting phase with narrow pressure range is embedded in the FM3 phase, adjacent to zero-temperature FM3-to-nonmagnetic transition. The temperature dependence of resistivity above T SC follows non-Fermi liquid form of T 1.6 . From these experimental facts, superconductivity is considered to be associated with the ferromagnetic fluctuation.