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Metal-insulator transition and magnetic fluctuations in polycrystalline Ru1-xRhxP investigated by 31P NMR

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Li,  S.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Takagi,  H.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Li, S., Kobayashi, Y., Itoh, M., Hirai, D., & Takagi, H. (2017). Metal-insulator transition and magnetic fluctuations in polycrystalline Ru1-xRhxP investigated by 31P NMR. Physical Review B, 95(15): 155137.


Cite as: https://hdl.handle.net/21.11116/0000-000E-D0DA-1
Abstract
P-31 NMR measurements have been made on polycrystalline samples to study a metal-insulator (MI) transition and magnetic fluctuations in Ru1-xRhxP which has metallic (M), pseudogap (PG), insulating (I), and superconducting (SC) phases. We find that RuP undergoes a crossover from the high-temperature (high-T) M phase to the PG phase with the pseudo spin-gap behavior probed by the nuclear spin-lattice relaxation rate at T-PG = 330 K. The first-orderMI transition is observed to take place from the PG phase to the low-T nonmagnetic I phase with the spin-gap energy of 1250 K at T-MI = 270 K. In the PG phase of Ru1-xRhx P with 0 <= x< 0.45, an analysis based on the modifiedKorringa relation, which is applicable to an itinerant paramagnetwith weak electron correlation, shows that antiferromagnetic (AFM) fluctuations described in the random-phase approximation are enhanced in the low-T and low-x region. Around the PG-M phase boundary at xc similar to 0 .45, 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.