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arXiv · 2111.03807

Phase transition in the 5d1 double perovskite Ba2CaReO6 induced by high magnetic field

Hajime Ishikawa·Daigorou Hirai·Akihiko Ikeda·Masaki Gen·Takeshi Yajima·Akira Matsuo·Yasuhiro H. Matsuda·Zenji Hiroi·Koichi Kindo
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Abstract

Magnetic properties of an antiferromagnetic double perovskite oxide Ba2CaReO6, where Re6+ (5d1) ions with large spin-orbit coupling are arranged on the face-centered-cubic lattice, are investigated using pulsed high magnetic field up to 66 T. Magnetization and magnetostriction measurements have revealed a magnetic field induced phase transition at around 50 T. The phase transition accompanies a jump of magnetization and longitudinal magnetostriction of approximately 2 10^(-4) with the change of power law behavior, indicating sizable coupling between the electronic degrees of freedom and the lattice. The high field phase exhibits a magnetic moment approximately 0.2 μB, which is close to the values observed in 5d1 double perovskite oxides with non-collinear magnetic structure. We argue that Ba2CaReO6 is an antiferromagnet that sits close to the phase boundary between the collinear and non-collinear phases, providing the target material for investigating the interplay between spin-orbital entangled electrons and magnetic field.

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Hajime Ishikawa, Daigorou Hirai, Akihiko Ikeda, Masaki Gen, Takeshi Yajima, Akira Matsuo, Yasuhiro H. Matsuda, Zenji Hiroi, Koichi Kindo. 2021-11-06. Phase transition in the 5d1 double perovskite Ba2CaReO6 induced by high magnetic field. https://doi.org/10.1103/physrevb.104.174422

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