标题： La2-xSrxCoMnO6（0<x<1）中由反位无序驱动的自发交换偏置效应 显示英文标题

标题： Antisite disorder driven spontaneous exchange bias effect in La2-xSrxCoMnO6 (0<x<1)

摘要： 在钙钛矿晶格中，通过二价碱土离子在稀土位点的掺杂，已经观察到具有空间相关电荷、自旋和轨道自由度的各种磁性和电子有序结构。 在这里，我们报告了由于在La2-xSrxCoMnO6（0 < x < 1）双钙钛矿中掺杂空穴载流子（Sr2+）而引起的反位无序驱动的自发交换偏置效应。 X射线衍射和拉曼光谱证实，随着Sr含量增加到x = 0.5，无序性增加，然后从x = 0.5到1逐渐减少。 X射线吸收光谱显示，只有Co以混合价态Co2+和Co3+存在，并通过Sr掺杂来补偿电荷中性。 磁输运与反位无序的增加密切相关。 B位点的反位无序通过引入各种磁相互作用，破坏长程铁磁有序，并在温度降低时引发回火玻璃动力学、相分离和倾斜型反铁磁行为。 这导致具有单向各向异性的新型磁微结构，从而产生可以随反位无序量调节的自发交换偏置效应。 显示英文摘要

摘要： Doping at the rare-earth site by divalent alkaline-earth ions in perovskite lattice has witnessed a variety of magnetic and electronic orders with spatially correlated charge, spin and orbital degrees of freedom. Here, we report an antisite disorder driven spontaneous exchange bias effect as a result of hole carrier (Sr2+) doping in La2-xSrxCoMnO6 (0 < x < 1) double perovskites. X-ray diffraction and Raman spectroscopy have evidenced an increase in disorder with the increase of Sr content up to x = 0.5 and thereby decreases from x = 0.5 to 1. X-ray absorption spectroscopy has revealed that only Co is present in mixed valent Co2+ and Co3+ states with Sr doping to compensate the charge neutrality. Magnetotransport is strongly correlated with the increase of antisite disorder. The antisite disorder at the B-site interrupts the long-range ferromagnetic order by introducing various magnetic interactions and instigates reentrant glassy dynamics, phase separation and canted type antiferromagnetic behavior with the decrease of temperature. This leads to novel magnetic microstructure with unidirectional anisotropy that causes spontaneous exchange bias effect that can be tuned with the amount of antisite disorder.