Kawasugi, Y., Yamazaki, S., Pustogow, A., & Tajima, N. (2023). Negative Magnetoresistance near the Mott Metal–Insulator Transition in the Quantum Spin Liquid Candidate κ-(BEDT-TTF)₂Cu₂(CN)₃. Journal of the Physical Society of Japan, 92(6), Article 065001. https://doi.org/10.7566/JPSJ.92.065001
We investigate the in-plane magnetoresistance of the quantum spin liquid candidate κ-(BEDT-TTF)₂Cu₂(CN)₃ near the metal–insulator phase boundary by fine-tuning the uniaxial strain of a thin single crystal. Negative magnetoresistance up to −40% is observed, implying that the insulating state below ∼6 K has lower intrinsic magnetism than the metallic state. The result is consistent with the recent remarks on the nonmagnetic transition to a valence-bond solid ground state.