Pressure-Induced Negative-Positive Magnetoresistance Crossover Near Metal-Insulator Transition in La_0.8Ag_0.1MnO₃

2023/12/10 by A. G. Gamzatov, Gamzatov, A. G., T. R. Arslanov +5
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2312.05862

openalex publication_date 2023/12/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigated the effect of high pressure on the field dependences of magnetoresistance (MR) in La_0.8Ag_0.1MnO₃ near the metal-insulator transition temperature. Our results showed that an increase in pressure results in a decrease in the magnitude of negative MR. At pressures P\geqslant5.6 GPa and magnetic fields up to 4 kOe, we observed a positive MR. However, with a further increase in magnetic field (>4 kOe), the MR again became negative. Therefore, we discovered a "negative-positive" MR crossover induced by high pressure near the transition temperature. We supported our experimental findings with a qualitative theoretical interpretation using the electron-hole model of MR. This theory explains observed the MR sign change.

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