1. Pressure-Tuned Exchange Coupling of a Quantum Spin Liquid in the Molecular Triangular Lattice κ-(ET)2Ag2(CN)3.
- Author
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Yasuhiro Shimizu, Takaaki Hiramatsu, Mitsuhiko Maesato, Akihiro Otsuka, Hideki Yamochi, Akihiro Ono, Masayuki Itoh, Makoto Yoshida, Masashi Takigawa, Yukihiro Yoshida, and Gunzi Saito
- Subjects
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SILVER compounds , *QUANTUM spin liquid , *NUCLEAR magnetic resonance - Abstract
The effects of pressure on a quantum spin liquid are investigated in an organic Mott insulator κ-(ET)2Ag2(CN)3 with a spin-1/2 triangular lattice. The application of negative chemical pressure to κ-(ET)2Cu2(CN)3, which is a well-known sister Mott insulator, allows for extensive tuning of antiferromagnetic exchange coupling, with J/kB=175-310 K, under hydrostatic pressure. Based on C13 nuclear magnetic resonance measurements under pressure, we uncover universal scaling in the static and dynamic spin susceptibilities down to low temperatures ~0.1kBT/J. The persistent fluctuations and residual specific heat coefficient are consistent with the presence of gapless low-lying excitations. Our results thus demonstrate the fundamental finite-temperature properties of a quantum spin liquid in a wide parameter range. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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