Spin-disordered quantum phases in a quasi-one-dimensional triangular lattice

Yukihiro Yoshida, Hiroshi Ito, Mitsuhiko Maesato, Yasuhiro Shimizu, Hiromi Hayama, Takaaki Hiramatsu, Yuto Nakamura, Hideo Kishida, Takashi Koretsune, Chisa Hotta, Gunzi Saito

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Large quantum fluctuations drive the spins in solids into magnetically disordered phases that are not simply paramagnetic. This class of system includes the valence bond crystals and quantum spin liquids, in which spin singlets - the basic unit of entangled pairs of spins - form solids and liquids, respectively. In both phases, geometrical frustration is expected to play a role. So far, very few candidate quantum-spin-liquid materials have been found, including an organic Mott insulator, -(ET) 2 Cu 2 (CN) 3, which is based on a regular triangular lattice. Here, we report a material, -(ET) 2 B(CN) 4, with different geometry - a highly distorted quasi-one-dimensional triangular lattice. The magnetic susceptibility follows that of the spin-1/2 Heisenberg model on this distorted lattice. The material sustains a magnetically disordered Mott insulating state with enhanced quantum fluctuations over a wide temperature range, and undergoes a transition into a spin-gapped phase at 5 K.

Original languageEnglish
Pages (from-to)679-683
Number of pages5
JournalNature Physics
Issue number8
Publication statusPublished - 2015 Jul 31


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