TY - JOUR
T1 - Ferromagnetism out of charge fluctuation of strongly correlated electrons in κ-(BEDT-TTF)2Hg(SCN)2Br
AU - Yamashita, Minoru
AU - Sugiura, Shiori
AU - Ueda, Akira
AU - Dekura, Shun
AU - Terashima, Taichi
AU - Uji, Shinya
AU - Sunairi, Yoshiya
AU - Mori, Hatsumi
AU - Zhilyaeva, Elena I.
AU - Torunova, Svetlana A.
AU - Lyubovskaya, Rimma N.
AU - Drichko, Natalia
AU - Hotta, Chisa
N1 - Funding Information:
The authors thank M. Urai for fruitful discussions. The work in JHU was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0019331. The work in Chernogolovka was carried out within the state assignment (number AAAA-A19-119092390079-8). The work in Japan was supported by KAKENHI (Grants-in-Aid for Scientific Research) Grants Nos. JP17K05533, JP18H01173, JP17K05497, JP17H02916, JP18H05225, JP18H05516, JP19K05397, JP19H01848, JP19K21842, JP21K03440, JP21K18597, and JP21H05191.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - We perform magnetic susceptibility and magnetic torque measurements on the organic κ-(BEDT-TTF)2Hg(SCN)2Br, which is recently suggested to host an exotic quantum dipole-liquid in its low-temperature insulating phase. Below the metal-insulator (MI) transition temperature, the magnetic susceptibility follows a Curie–Weiss law with a positive Curie–Weiss temperature, and a particular M∝H curve is observed. The emergent ferromagnetically interacting spins amount to about 1/6 of the full spin moment of localized charges. Taking account of the possible inhomogeneous quasi-charge-order that forms a dipole-liquid, we construct a model of antiferromagnetically interacting spin chains in two adjacent charge-ordered domains, which are coupled via fluctuating charges on a Mott-dimer at the boundary. We find that the charge fluctuations can draw a weak ferromagnetic moment out of the spin singlet domains.
AB - We perform magnetic susceptibility and magnetic torque measurements on the organic κ-(BEDT-TTF)2Hg(SCN)2Br, which is recently suggested to host an exotic quantum dipole-liquid in its low-temperature insulating phase. Below the metal-insulator (MI) transition temperature, the magnetic susceptibility follows a Curie–Weiss law with a positive Curie–Weiss temperature, and a particular M∝H curve is observed. The emergent ferromagnetically interacting spins amount to about 1/6 of the full spin moment of localized charges. Taking account of the possible inhomogeneous quasi-charge-order that forms a dipole-liquid, we construct a model of antiferromagnetically interacting spin chains in two adjacent charge-ordered domains, which are coupled via fluctuating charges on a Mott-dimer at the boundary. We find that the charge fluctuations can draw a weak ferromagnetic moment out of the spin singlet domains.
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U2 - 10.1038/s41535-021-00387-6
DO - 10.1038/s41535-021-00387-6
M3 - Article
AN - SCOPUS:85116839805
SN - 2397-4648
VL - 6
JO - npj Quantum Materials
JF - npj Quantum Materials
IS - 1
M1 - 87
ER -