Metal-insulator transition and magnetic fluctuations in polycrystalline Ru1-xRhxP investigated by 31P NMR
Metal-insulator transition and magnetic fluctuations in polycrystalline Ru1-xRhxP investigated by 31P NMR
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通过 31P NMR 研究多晶 Ru1-xRhxP 中的金属-绝缘体转变和磁波动
DOI：
10.1103/physrevb.95.155137
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and H. Takagi
中科院分区：
文献类型：
--
作者：
S. Li;Y. Kobayashi;M. Itoh;D. Hirai;and H. Takagi
对多晶样品进行了核磁共振测量，研究了具有金属相(M)、赝隙相（PG）、绝缘相(I)和超导相（SC）的金属-绝缘体（MI）相变和磁波动。我们发现RuP经历了从高温（高）M相到PG相的交叉，并通过核自旋-晶格弛豫速率探测到伪自旋间隙行为。从PG相到低非磁性I相发生了一阶MI跃迁，自旋间隙能为1250 K at。在与的PG相中，基于修正Korringa关系（适用于弱电子相关的流动顺磁体）的分析表明，随机相位近似中描述的反铁磁（AFM）波动在低区和低区增强。在PG-M相边界附近，存在SC相，其正态电子-电子相互作用可以忽略不计。我们讨论了MI转变，从M相到PG相的交叉，以及基于能带结构的每个相的磁性能。
NMR measurements have been made on polycrystalline samples to study a metal-insulator (MI) transition and magnetic fluctuations inwhich has metallic (M), pseudogap (PG), insulating (I), and superconducting (SC) phases. We find that RuP undergoes a crossover from the high-temperature (high-) M phase to the PG phase with the pseudo spin-gap behavior probed by the nuclear spin-lattice relaxation rate at. The first-order MI transition is observed to take place from the PG phase to the low-nonmagnetic I phase with the spin-gap energy of 1250 K at. In the PG phase ofwith, an analysis based on the modified Korringa relation, which is applicable to an itinerant paramagnet with weak electron correlation, shows that antiferromagnetic (AFM) fluctuations described in the random-phase approximation are enhanced in the low-and low-region. Around the PG-M phase boundary at, there is the SC phase whose normal state has negligible electron-electron interaction. We discuss the MI transition, the crossover from the M phase to the PG phase, and the magnetic properties of each phase based on the band structure.