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Re-order parameter of interacting thermodynamic magnets

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Title
Re-order parameter of interacting thermodynamic magnets
Author(s)
Byung Cheol Park; Lee, Howon; Oh, Sang Hyup; Shin, Hyun Jun; Choi, Young Jai; Taewoo Ha
Publication Date
2024-04
Journal
Nature Communications, v.15, no.1
Publisher
Nature Publishing Group
Abstract
Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here, we report a dynamic nonequilibrium order parameter termed re-order parameter to determine subtle phases and their transitions in interacting magnets. The dynamical precession of magnetization, so-called magnon, premises as a reliable re-order parameter of strong spin-orbit coupled magnets. We employ orthoferrites YFeO3 and its Mn-doped variations, where diverse magnetic phases, including canted antiferromagnetic (Γ4) and collinear antiferromagnetic (Γ1) states, have been well-established. Low-energy magnon uncovers the spin-orbit coupling-induced subtle magnetic structures, resulting in distinct terahertz emissions. The temporal and spectral parameters of magnon emission exhibit characteristics akin to BCS-type order parameters, constructing the magnetic phase diagram of Mn-doped YFeO3. This approach further reveals a concealed ferrimagnetic phase within the Γ1 state, underscoring its potential to search for hidden phases of materials, completing their phase diagrams. © The Author(s) 2024.
URI
https://pr.ibs.re.kr/handle/8788114/15194
DOI
10.1038/s41467-024-47637-2
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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