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Spin-singlet ground state of the coupled Jeff = 12 alternating chain system Sr2 Co(SeO3)3

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Title
Spin-singlet ground state of the coupled Jeff = 12 alternating chain system Sr2 Co(SeO3)3
Author(s)
Panneer, Muthuselvam I.; Madhumathy, R.; Saranya, K.; Moovendaran, K.; Suheon Lee; Choi, Kwang-Yong; Chen, Wei-Tin; Wang, Chin-Wei; Chen, Peng-Jen; Ponmurugan, M.; Ou, Min-Nan; Chen, Yang-Yuan; Kim, Heung-Sik; Sankar, R.
Publication Date
2022-12
Journal
Physical Review B, v.106, no.21
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.We report a detailed study of the structural, magnetic, thermodynamic, and electronic properties of a coupled Jeff = 12 alternating chain Sr2Co(SeO3)3 compound using magnetic susceptibility χ(T), magnetic specific heat Cm(T), magnetization, and neutron diffraction measurements along with first-principles calculations. The first-principles calculations based on the density functional theory suggest that Sr2Co(SeO3)3 forms a quasi-one-dimensional chain with bond alternation and interchain interactions. χ(T), Cm(T), and neutron powder diffraction measurements confirm that no long-range magnetic ordering occurs down to 100 mK. Instead, a maximum in χ(T) and Cm(T) and an exponential drop of χ(T) and Cp(T) as T→0 K point to a spin-singlet ground state. The analysis of χ(T) and Cm(T) based on a J1-J2 alternating Heisenberg model shows the bond alternation α=J2/J1≈0.7 and a spin gap of Δ≈3 K. Our work demonstrates that Sr2Co(SeO3)3 is a coupled alternating chain system based on spin-orbit entangled Jeff = 12.
URI
https://pr.ibs.re.kr/handle/8788114/12483
DOI
10.1103/PhysRevB.106.214417
ISSN
2469-9950
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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