Thermodynamic properties of a spin-1/2 spin-liquid state in a κ -type organic salt

By S. Yamashita, Y. Nakazawa, M. Oguni, Y. Oshima, H. Nojiri, Y. Shimizu, K. Miyagawa, K. Kanoda. 2008

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Thermal-transport measurements in a quantum spin-liquid state of the frustrated triangular magnet -(BEDT-TTF) 2 Cu 2 (CN) 3 (2009, critical): “We find, rather unexpectedly, unambiguous evidence for the absence of a gapless excitation, which sharply contradicts recent reports of heat capacity measurement”
Quantum spin liquid states (2016, background): “A linear temperature dependence of the specific heat and a Pauli-like spin susceptibility have been found in both materials at low temperature, suggesting that the low-energy excitations are spin-1/2 fermions with a Fermi surface (Watanabe et al., 2012; Yamashita et al., 2008).”
Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors (2010, background): “This motivated measurements of the thermal conductance tensor in a magnetic field perpendicular to the layers (Yamashita et al., 2010).”
Instability of a quantum spin liquid in an organic triangular-lattice antiferromagnet (2010, background): “Specific-heat measurements suggest that this material exhibits a gapless state with a spinon Fermi surfac”
Quantum spin liquids (2019, background): “At low temperatures, the spin susceptibility c is a constant and the heat capacity C = gT has a linear temperature dependence (74).”