TY - JOUR
T1 - Magnetoelastic couplings in the deformed kagome quantum spin lattice of volborthite
AU - Ikeda, Akihiko
AU - Furukawa, Shunsuke
AU - Janson, Oleg
AU - Matsuda, Yasuhiro H.
AU - Takeyama, Shojiro
AU - Yajima, Takeshi
AU - Hiroi, Zenji
AU - Ishikawa, Hajime
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant-in-Aid for Young Scientists (B) Grant No. 16K17738, Grant-in-Aid for Scientific Research (B) Grant No. 16H04009, and the internal research grant from ISSP, UTokyo. O.J. was supported by the Austrian Science Fund (FWF) through the Lise Meitner programme, Project No. M2050, and by the Leibniz Society through the Leibniz Competition. DFT calculations have been done on the Vienna Scientific Cluster (VSC).
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/4/29
Y1 - 2019/4/29
N2 - Microscopic spin interactions on a deformed kagome lattice of volborthite are investigated through magnetoelastic couplings. A negative longitudinal magnetostriction ΔL/L<0 in the b axis is observed, which depends on the magnetization M with a peculiar relation of ΔL/L�M1.3. Based on the exchange striction model, it is argued that the negative magnetostriction originates from a pantographlike lattice change of the Cu-O-Cu chain in the b axis, and that the peculiar dependence arises from the local spin correlation. This idea is supported by DFT+U calculations simulating the lattice change and a finite-size calculation of the spin correlation, indicating that the recently proposed coupled-trimer model is a plausible one.
AB - Microscopic spin interactions on a deformed kagome lattice of volborthite are investigated through magnetoelastic couplings. A negative longitudinal magnetostriction ΔL/L<0 in the b axis is observed, which depends on the magnetization M with a peculiar relation of ΔL/L�M1.3. Based on the exchange striction model, it is argued that the negative magnetostriction originates from a pantographlike lattice change of the Cu-O-Cu chain in the b axis, and that the peculiar dependence arises from the local spin correlation. This idea is supported by DFT+U calculations simulating the lattice change and a finite-size calculation of the spin correlation, indicating that the recently proposed coupled-trimer model is a plausible one.
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U2 - 10.1103/PhysRevB.99.140412
DO - 10.1103/PhysRevB.99.140412
M3 - Article
AN - SCOPUS:85065507393
SN - 2469-9950
VL - 99
JO - Physical Review B
JF - Physical Review B
IS - 14
M1 - 140412
ER -