【大学频道】北京大学量子材料科学中心呈献 | 中科院高能物理研究所缪平研究员
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图 | 缪平
题 目:Large magnetovolume effect in a cobaltite perovskite
报告人:缪平单 位:中国科学院高能物理研究所时 间:2019-12-25地 点:北京大学报告摘要
Materials that show negative thermal expansion (NTE) have significant industrial merit because they can be used to fabricate composites whose dimensions remain invariant upon heating. In some materials, NTE is concomitant with the spontaneous magnetization due to the magnetovolume effect (MVE). Here we report a new class of MVE material; namely, a layered perovskite PrBaCo2O5.5+x (0 ≤ x ≤ 0.41), in which strong NTE (β ≈ -3.6×10-5K-1 at x = 0.24) is induced by hole doping. Furthermore, the MVE is not limited to the PrBaCo2O5.5+x but is also observed in the NdBaCo2O5.5+x. Through a comprehensive study with multiple probes (neutron, muon, electron and X-ray), we found the MVE originates from an magnetoelectric transition from an antiferromagnetic insulating large-volume (AFILV) phase to a ferromagnetic metallic small-volume (FMSV) phase.
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