Journal
PHYSICAL REVIEW B
Volume 106, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.064202
Keywords
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Funding
- NSF [DMR-2004074]
- KAKENHI [JP17K05533, JP18H01173, JP17K05497, JP17H02916, JP19K05397, 19H01848, 19K21842]
- IPMU-ISSP-JHU collaborative program in Physics and Astronomy
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This study discusses the coupling of charge and spin degrees of freedom in a material based on the BEDT-TTF molecule through magnetic property measurements at different temperatures. The observed charge and spin separation below 30 K and coupling below 24 K are significant for understanding the properties of quasi-two-dimensional Mott insulators.
Triangular lattice quasi-two-dimensional Mott insulators based on the bis(ethylenedithio)tetrathiafulvalene (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 such material, kappa-(BEDT-TTF)(2)Hg(SCN)(2)Cl, which is found at the border of the phase transition between a Mott insulator into a charge ordered state. Our magnetic susceptibility and cantilever magnetization 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 T-CO = 30 K and T-S = 24 K we observe charge and spin separation due to one-dimensional charge stripes formed in this material below T-CO = 30 K. Below T-S = 24 K charge and spin degrees of freedom demonstrate coupling. Spin-singlet correlations develop below 24 K, however, the 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.
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