空位有序钙钛矿SrV0.3Fe0.7O2.8在低温下的晶体结构和磁阻

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-04-01 DOI:10.1039/D5CE00028A

Teppei Nagase, Takumi Nishikubo, Yuki Sakai, Kei Shigematsu, Ko Mibu, Masato Hagihala, Masaki Azuma and Takafumi Yamamoto

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引用次数: 0

摘要

钙钛矿氧化物的空位排序带来了丰富多样的结构和相应的物理性质。在此之前，我们报道了原始钙钛矿（111）p平面上有序氧空位的SrV0.3Fe0.7O2.8的室温磁电阻。本文研究了SrV0.3Fe0.7O2.8在低温下的结构和物理性能。当温度降至200 K时，该化合物经历了从菱形相到单斜相的结构相变。转变引起八面体倾斜，影响其磁化行为：化合物表现出弱铁磁性，在Ts以上矫顽力几乎为零，而在Ts以下矫顽力显著增加，保持弱铁磁性。我们还观察到通过降低温度来增强磁电阻，在130 K和9 T时达到- 18%。

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Crystal structure and magnetoresistance of vacancy-ordered perovskite SrV0.3Fe0.7O2.8 at low temperature†

Vacancy-ordering in perovskite oxides brings a rich variety of structures and accompanying physical properties. Previously, we reported room-temperature magnetoresistance in SrV_0.3Fe_0.7O_2.8 with ordered oxygen vacancies in the primitive perovskite (111)_p plane. In this report, we characterize the structure and physical properties of SrV_0.3Fe_0.7O_2.8 at low temperatures. This compound undergoes a structural phase transition from the rhombohedral phase to the monoclinic phase by cooling down to T_s = 200 K. The transition induces octahedral tilting, affecting its magnetization behaviour: The compound shows weak ferromagnetism with almost zero coercivity above T_s, while the coercivity prominently increases below T_s, keeping its weak ferromagnetism. We also observed an enhancement of magnetoresistance by decreasing temperature, reaching −18% at 130 K and 9 T.