Speaker
Description
The perovskite ABO₃ is a significant class of materials with properties, such as superconductivity, ferroelectricity, charge ordering, colossal magnetoresistance [1]. By substituting the crystallographic A- or B-site, the material can be tuned to increase potential for applications. Our focus is so-called orthochromites RCrO3 (R = rare earth, Sc, and Y). The RCrO3 has received much interest as an electrode material [2], an interconnector for solid-state fuel cells [3], and a magnetocaloric effect for refrigeration [4]. However, there is little understanding because of availability of large single crystal samples [6]. It is important to understand RCrO3 together with the other outstanding perovskites RTiO3, RVO3, RMnO3, RFeO3 (S = 1/2, 1, 2, and 5/2), and so on [7].
In this presentation, I will present a series of inelastic neutron scattering experiments of orthochromites, such as, LaCrO3 (4.0 g), ErCrO3 (6.3 g) and HoCrO3 (3.5 g) and so on. We have performed a series of neutron scattering experiments on 4SEASONS, HRC at J-PARC and Wombat, Taipan, Emu, Sika at ANSTO. To describe the magnetic excitations, I am trying to find a general spin Hamiltonian consists of exchange interactions between Cr3+, Dzyaloshinskii-Moriya (DM) interactions, single ion anisotropic, exchange interactions between Cr3+ -R3+, crystal field excitations, hyperfine field excitations from R3+, and so on. I will describe the general overview of magnetic excitations from μeV to 100 meV in RCrO3
[1] Eric Bousquet and Andres Cano, J. Phys.: Condens. Matter 28 123001(2016) [2] Keitaro Tezuka, Yukio Hinatsu Akio Nakamura, Toshiya Inami, Yutaka Shimojo and Yukio Morii, Journal of Solid State Chemistry, 141, 404—410 (1998) [3] Shogo Miyoshi, Shigenori Onuma, Atsushi Kaimai, Hiroshige Matsumoto, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki and Harumi Yokokawa, Journal of Solid State Chemistry 177 (2004) 4112–4118.
[4] Sudipta Mahana, U Manju and D Topwal, J. Phys. D: Appl. Phys. 51 (2018) 305002
[6] Y. Zhu, K. Sun, H.-F. Li, et al., Coordination Chemistry Reviews 475, 214873 (2023), iScience Volume 25, Issue 4, 104111 (2022). Yinghao Zhu, PhD thesis at University of Macau (2022) [7] A Podlesnyak, S E Nikitin, and G Ehlers, J. Phys.: Condens. Matter 33 403001(2021)
| Field of Condensed Matter | Magnetism |
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