Colossal Magnetoresistance and Heavy Fermions in Eu0.9Yb0.1B6 System

IF 2.4 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Physics of the Solid State Pub Date : 2026-09-24 DOI:10.1134/S1063783426601347

M. Anisimov, A. Bogach, V. Voronov, V. Glushkov

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Abstract

Current work presents the study of transport characteristics [resistivity, transverse magnetoresistance (TMR), Hall effect] of a high-quality polycrystalline sample of Eu_0.9Yb_0.1B₆ compound in the temperature range of 2–300 K, in magnetic fields up to 8 T. The obtained data confirm the realization in Eu_0.9Yb_0.1B₆ of a state with electronic and magnetic phase separation (EMPS), which is typical for parent europium hexaboride. For EMPS the “metallization” of the system (T_M ≈ 15 K) precedes ferromagnetic (FM) ordering (T_C ≈ 11.4 K). In the temperature range T_C−T_M, the enhancement of the colossal magnetoresistance (CMR) effect was detected. It was registered that a maximum value of –∆ρ/ρ ≈ 89% is achieved at T_M point. The analysis performed allows estimating the effective mass of the electrons as \({{m}_{e}}{\text{*}}\) ≈ 0.9–20m₀, which confirms the formation of heavy fermions in the paramagnetic (PM) phase of Eu_0.9Yb_0.1B₆. To explain mentioned effects the polaronic scenario is proposed.

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Eu0.9Yb0.1B6体系中的巨磁阻和重费米子

本文研究了Eu0.9Yb0.1B6化合物的高质量多晶样品在2-300 K温度范围内，在高达8 t的磁场下的输运特性[电阻率，横向磁电阻（TMR），霍尔效应]。所得数据证实了Eu0.9Yb0.1B6中实现了电子和磁相分离（EMPS）的状态，这是母质六硼化铕的典型特征。对于EMPS，系统的“金属化”（TM≈15 K）先于铁磁（FM）有序（TC≈11.4 K）。在TC ～ TM温度范围内，检测到巨磁电阻（CMR）效应的增强。记录的最大值为-∆ρ/ρ≈89% is achieved at TM point. The analysis performed allows estimating the effective mass of the electrons as \({{m}_{e}}{\text{*}}\) ≈ 0.9–20m0, which confirms the formation of heavy fermions in the paramagnetic (PM) phase of Eu0.9Yb0.1B6. To explain mentioned effects the polaronic scenario is proposed.

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来源期刊

Physics of the Solid State 物理-物理：凝聚态物理

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.