论文标题
钴矿石中磁化效应的起源
Origin of magnetovolume effect in a cobaltite
论文作者
论文摘要
分层的钙钛矿PRBACO2O5.5+X表现出强大的阴性热膨胀（NTE），其可能被制造成具有零热膨胀的复合材料。发现NTE与自发性磁有序密切相关，称为磁盘效应（MVE）。在这里，我们以令人信服的证据报告说，Prbaco2O5.5+X中的连续类似于不连续的特征，源自从磁电磁磁性绝缘（AFILMAGNIC）阶段到铁磁性金属小型vol-volm-volm-volm-volm-volm-vmsv（fmsv）阶段。此外，磁电效应（ME）对多种外部刺激显示高敏性，例如温度，载掺杂，静水压力，磁场等，与众所周知的ME相比，诸如巨大的磁势稳定和多效效应，涉及晶体结构的对称性破坏，ME在cobaltite Issostrute Issustrualterrustalistrultralitural Iseralistorralistrultralistrultralistrult。我们的发现为实现ME和NTE提供了新的途径，该途径可能会在新技术中找到应用。
The layered perovskite PrBaCo2O5.5+x demonstrates a strong negative thermal expansion (NTE) which holds potential for being fabricated into composites with zero thermal expansion. The NTE was found to be intimately associated with the spontaneous magnetic ordering, known as magnetovolume effect (MVE). Here we report with compelling evidences that the continuous-like MVE in PrBaCo2O5.5+x is intrinsically of discontinuous character, originating from an magnetoelectric transition from an antiferromagnetic insulating large-volume (AFILV) phase to a ferromagnetic metallic small-volume (FMSV) phase. Furthermore, the magnetoelectric effect (ME) shows high sensitivity to multiple external stimuli such as temperature, carrier doping, hydrostatic pressure, magnetic field etc. In contrast to the well-known ME such as colossal magnetoresistance and multiferroic effect which involve symmetry breaking of crystal structure, the ME in the cobaltite is purely isostructural. Our discovery provides a new pathway to realizing the ME as well as the NTE, which may find applications in new techniques.
