Cho, Hwanbeom ORCID: 0000-0002-7206-3698, Kim, Choong H., Lee, Yongmoon, Komatsu, Kazuki, Cho, Byeong-Gwan, Cho, Deok-Yong ORCID: 0000-0001-5789-8286, Kim, Taehun ORCID: 0000-0002-9216-2108, Kim, Chaebin ORCID: 0000-0001-5392-7756, Kim, Younghak, Koo, Tae Yeong, Noda, Yukio, Kagi, Hiroyuki, Khomskii, Daniel, I, Seoung, Donghoon and Park, Je-Geun (2021). Pressure-induced transition from J(eff)=1/2 to S=1/2 states in CuAl2O4. Phys. Rev. B, 103 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Cho, HwanbeomUNSPECIFIEDorcid.org/0000-0002-7206-3698UNSPECIFIED
Kim, Choong H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, YongmoonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Komatsu, KazukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cho, Byeong-GwanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cho, Deok-YongUNSPECIFIEDorcid.org/0000-0001-5789-8286UNSPECIFIED
Kim, TaehunUNSPECIFIEDorcid.org/0000-0002-9216-2108UNSPECIFIED
Kim, ChaebinUNSPECIFIEDorcid.org/0000-0001-5392-7756UNSPECIFIED
Kim, YounghakUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koo, Tae YeongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Noda, YukioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kagi, HiroyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Khomskii, Daniel, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seoung, DonghoonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Park, Je-GeunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-600274
DOI: 10.1103/PhysRevB.103.L081101
Journal or Publication Title: Phys. Rev. B
Volume: 103
Number: 8
Date: 2021
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60027

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