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Pressure-induced transition from J(eff)=1/2 to S=1/2 states in CuAl2O4

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Title
Pressure-induced transition from J(eff)=1/2 to S=1/2 states in CuAl2O4
Author(s)
Hwanbeom Cho; Choong H. Kim; Lee, Yongmoon; Komatsu, Kazuki; Cho, Byeong-Gwan; Cho, Deok-Yong; Taehun Kim; Chaebin Kim; Kim, Younghak; Koo, Tae Yeong; Noda, Yukio; Kagi, Hiroyuki; Khomskii, Daniel, I; Seoung, Donghoon; Je-Geun Park
Publication Date
2021-02
Journal
Physical Review b, v.103, no.8, pp.1 - 7
Publisher
AMER PHYSICAL SOC
Abstract
The spin-orbit entangled (SOE) J(eff) state has been a fertile ground to study quantum phenomena. Contrary to the conventional weakly correlated J(eff) = 1/2 state of 4d and 5d transition metal compounds, the ground state of CuAl2O4 hosts a J(eff) = 1/2 state with a strong correlation of Coulomb U. Here, we report that, surprisingly, Cu2+ ions of CuAl2O4 overcome the otherwise usually strong Jahn-Teller distortion and instead stabilize the SOE state, although the cuprate has relatively small spin-orbit coupling. From the x-ray absorption spectroscopy and high-pressure x-ray diffraction studies, we obtained definite evidence of the J(eff )= 1/2 state with a cubic lattice at ambient pressure. We also found the pressure-induced structural transition to a compressed tetragonal lattice consisting of the spin-only S = 1/2 state for pressure P-c > 8 GPa. This phase transition from the Mott insulating J(eff) = 1/2 to the S = 1/2 states is a unique phenomenon. Our study offers an example of the SOE J(eff) state under strong electron correlation and its pressure-induced transition to the S = 1/2 state.
URI
https://pr.ibs.re.kr/handle/8788114/9208
DOI
10.1103/PhysRevB.103.L081101
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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