标题： B位掺杂锰氧化物中的磁重构 显示英文标题

标题： Magnetic Reconstructions in B-site Doped Manganites

摘要： B位掺杂剂的磁性控制B位掺杂的锰氧化物RE$_{1-x}$AE$_{x}$Mn$_{1-\eta}$B$_{\eta}$O$_3$中的磁相。相同价态的不同B位掺杂剂掺入相同的参考锰氧化物中，在低温下会导致不同的磁相，这无法通过价态变化的场景来解释。我们关注CE-CO-OO-I锰氧化物在半填充$x=0.50$时的三价B位掺杂剂，通过使用包含超交换相互作用、Jahn-Teller晶格畸变和二维替代无序的两轨道双交换模型，研究B位掺杂剂与相邻Mn位之间的磁相互作用的作用。我们表明，由于修改后的双交换和超交换相互作用导致的B位掺杂剂周围的磁重构控制了B位掺杂锰氧化物中的相竞争。 显示英文摘要

摘要： The magnetic nature of the B-site dopants controls the magnetic phases in B-site doped manganites RE$_{1-x}$AE$_{x}$Mn$_{1-\eta}$B$_{\eta}$O$_3$. Different B-site dopants of equal valence, doped into the same reference manganite, lead to different magnetic phases at low temperature, which can not be explained using the valence change scenario. We focus on trivalent B-site dopants in CE-CO-OO-I manganites at half-filling $x=0.50$ to study the role of magnetic interactions between the B-site dopants and the neighboring Mn-sites by using a two-orbital double-exchange model including super-exchange interactions, Jahn-Teller lattice distortions and substitutional disorder in two dimensions. We show that the magnetic reconstructions around the B-site dopants due to the modified double-exchange and super-exchange interactions control the phase competition in B-site doped manganites.