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Charge and spin interplay in a molecular-dimer-based organic Mott insulatorстатья
- Авторы: Drichko Natalia, Sugiura Shiori, Yamashita Minoru, Ueda Akira, Uji Shinya, Hassan Nora, Sunairi Yoshiya, Mori Hatsumi, Zhilyaeva Elena I., Torunova Svetlana, Lyubovskaya Rimma N.
- Журнал: Physical Review B
- Том: 106
- Номер: 6
- Год издания: 2022
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 064202-1
- Номер статьи: 064202
- DOI: 10.1103/physrevb.106.064202
- Аннотация: Triangular lattice quasi-two-dimensional Mott insulators based on BEDT-TTF molecule and its analogies present a possibility to produce exotic phases by coupling charge and spin degrees of freedom. In this work we discuss magnetic properties of one of such materials, k-(BEDTTTF)2Hg(SCN)2Cl, which is found at the border of the phase transition between a Mott insulatorinto a charge ordered state. Our magnetic susceptibility and cantilever magnetisation measurements demonstrate how the charge degree of freedom defines magnetic properties for few different charge phases observed in this material as a function of temperature. Between TCO = 30 K and TS = 24 K we observe charge and spin separation due to one-dimensional charge stripes formed in this material below TCO = 30 K. Below TS = 24 K charge and spin degrees of freedom demonstrate coupling. Spin singlet correlations develop below 24 K, however melting of charge order below 15 K prevents the spin singlet state formation, leaving the system in the inhomogeneous state with charge ordered spin singlet domains and charge and spin fluctuating ones.
- Добавил в систему: Жиляева Елена Ивановна