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

doi:10.1038/nphys3359

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

SCI - Physics

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	679-683
Number of pages	5
Journal	Nature Physics
Volume	11
Issue number	8
DOIs	https://doi.org/10.1038/nphys3359
Publication status	Published - 2015 Jul 31

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title = "Spin-disordered quantum phases in a quasi-one-dimensional triangular lattice",

abstract = "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.",

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

note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number 23225005 and 25800204. We thank H. Kageyama for his comments. Publisher Copyright: {\textcopyright} 2015 Macmillan Publishers Limited.",

year = "2015",

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doi = "10.1038/nphys3359",

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AU - Yoshida, Yukihiro

AU - Ito, Hiroshi

AU - Maesato, Mitsuhiko

AU - Shimizu, Yasuhiro

AU - Hayama, Hiromi

AU - Hiramatsu, Takaaki

AU - Nakamura, Yuto

AU - Kishida, Hideo

AU - Koretsune, Takashi

AU - Hotta, Chisa

AU - Saito, Gunzi

PY - 2015/7/31

Y1 - 2015/7/31

N2 - 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.

AB - 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.

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

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