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Tytuł pozycji:

Magnetoelectric Behavior from S=1/2 Asymmetric Square Cupolas.

Tytuł :
Magnetoelectric Behavior from S=1/2 Asymmetric Square Cupolas.
Autorzy :
Kato Y; Department of Applied Physics, The University of Tokyo, Hongo, 7-3-1, Bunkyo, Tokyo 113-8656, Japan.
Kimura K; Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
Miyake A; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Tokunaga M; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Matsuo A; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Kindo K; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Akaki M; Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Hagiwara M; Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Sera M; Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
Kimura T; Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
Motome Y; Department of Applied Physics, The University of Tokyo, Hongo, 7-3-1, Bunkyo, Tokyo 113-8656, Japan.
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Źródło :
Physical review letters [Phys Rev Lett] 2017 Mar 10; Vol. 118 (10), pp. 107601. Date of Electronic Publication: 2017 Mar 09.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Original Publication: New York : American Physical Society
Entry Date(s) :
Date Created: 20170325 Date Completed: 20180205 Latest Revision: 20180205
Update Code :
20210210
DOI :
10.1103/PhysRevLett.118.107601
PMID :
28339271
Czasopismo naukowe
Magnetoelectric properties are studied by a combined experimental and theoretical study of a quasi-two-dimensional material composed of square cupolas, Ba(TiO)Cu_{4}(PO_{4})_{4}. The magnetization is measured up to the field above the saturation, and several anomalies are observed depending on the field directions. We propose a S=1/2 spin model with Dzyaloshinskii-Moriya interactions, which reproduces the full magnetization curves well. Elaborating the phase diagram of the model, we show that the anomalies are explained by magnetoelectric phase transitions. Our theory also accounts for the scaling of the dielectric anomaly observed in the experiments. The results elucidate the crucial role of the in-plane component of Dzyaloshinskii-Moriya interactions, which is induced by the noncoplanar buckling of a square cupola. We also predict a "hidden" phase and another magnetoelectric response, both of which appear in a nonzero magnetic field.

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