TY - JOUR
T1 - Antiferromagnetic ordering of organic Mott insulator λ-(BEDSe-TTF)2 GaCl4
AU - Ito, A.
AU - Kobayashi, T.
AU - Sari, D. P.
AU - Watanabe, I.
AU - Saito, Y.
AU - Kawamoto, A.
AU - Tsunakawa, H.
AU - Satoh, K.
AU - Taniguchi, H.
N1 - Funding Information:
The authors would like to thank Prof. R. Kato for his advice on the synthesis of the BEDSe-TTF molecule. This work was partly supported by Hokkaido University, Global Facility Center (GFC), Advanced Physical Property Open Unit (APPOU), funded by MEXT under “Support Program for Implementation of New Equipment Sharing System” (JPMXS0420100318). This work was also partially supported by the Japan Society for the Promotion of Science KAKENHI Grants No. 20K14401, No. 19K03758, and No. 21K03438.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/7/15
Y1 - 2022/7/15
N2 - The band structure and magnetic properties of organic charge-transfer salt λ-(BEDSe-TTF)2GaCl4 [BEDSe-TTF: bis(ethylenediseleno)tetrathiafulvalene; abbreviated as λ-BEDSe] are investigated. The reported crystal structure is confirmed using X-ray diffraction measurements, and the transfer integrals are calculated. The degree of electron correlation U/W (U: on-site Coulomb repulsion, W: bandwidth) of λ-BEDSe is larger than one and comparable to that of the isostructural Mott insulator λ-(ET)2GaCl4 (ET: bis(ethylenedithio)tetrathiafulvalene, abbreviated as λ-ET), whereas the U/W of the superconducting salt λ-(BETS)2GaCl4 [BETS: bis(ethylenedithio)tetraselenafulvalene] is smaller than one. C13-NMR and μSR measurements revealed that λ-BEDSe undergoes an antiferromagnetic (AF) ordering below TN=22 K. In the AF state, discrete C13-NMR spectra with a remaining central peak are observed, indicating the commensurate AF spin structure also observed in λ-ET. The similarity of the structural and magnetic properties between λ-BEDSe and λ-ET suggests that both salts are in the same electronic phase, i.e., the physical properties of λ-BEDSe can be understood by the universal phase diagram of bandwidth-controlled λ-type organic conductors obtained by donor molecule substitution.
AB - The band structure and magnetic properties of organic charge-transfer salt λ-(BEDSe-TTF)2GaCl4 [BEDSe-TTF: bis(ethylenediseleno)tetrathiafulvalene; abbreviated as λ-BEDSe] are investigated. The reported crystal structure is confirmed using X-ray diffraction measurements, and the transfer integrals are calculated. The degree of electron correlation U/W (U: on-site Coulomb repulsion, W: bandwidth) of λ-BEDSe is larger than one and comparable to that of the isostructural Mott insulator λ-(ET)2GaCl4 (ET: bis(ethylenedithio)tetrathiafulvalene, abbreviated as λ-ET), whereas the U/W of the superconducting salt λ-(BETS)2GaCl4 [BETS: bis(ethylenedithio)tetraselenafulvalene] is smaller than one. C13-NMR and μSR measurements revealed that λ-BEDSe undergoes an antiferromagnetic (AF) ordering below TN=22 K. In the AF state, discrete C13-NMR spectra with a remaining central peak are observed, indicating the commensurate AF spin structure also observed in λ-ET. The similarity of the structural and magnetic properties between λ-BEDSe and λ-ET suggests that both salts are in the same electronic phase, i.e., the physical properties of λ-BEDSe can be understood by the universal phase diagram of bandwidth-controlled λ-type organic conductors obtained by donor molecule substitution.
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U2 - 10.1103/PhysRevB.106.045114
DO - 10.1103/PhysRevB.106.045114
M3 - Article
AN - SCOPUS:85134879872
SN - 0163-1829
VL - 106
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 4
M1 - 045114
ER -