Gapless Quantum Spin Liquid in an Organic Spin-1/2 Triangular-Lattice κ - H3(Cat-EDT-TTF)2

被引：145

作者：

Isono, Takayuki ^{[1
]}

Kamo, Hiromichi ^{[1
]}

Ueda, Akira ^{[1
]}

Takahashi, Kazuyuki ^{[2
]}

Kimata, Motoi ^{[1
]}

Tajima, Hiroyuki ^{[1
]}

Tsuchiya, Satoshi ^{[3
]}

Terashima, Taichi ^{[3
]}

Uji, Shinya ^{[3
]}

Mori, Hatsumi ^{[1
]}

机构：

[1] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[2] Kobe Univ, Dept Chem, Kobe, Hyogo 6578501, Japan

[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050003, Japan

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 17期

关键词：

ANTIFERROMAGNET; STATE; EXCITATIONS; FRUSTRATION; INSULATOR; TORQUE; SALTS; PHASE; MODEL;

D O I：

10.1103/PhysRevLett.112.177201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the results of SQUID and torque magnetometry of an organic spin-1/2 triangular-lattice kappa - H(3)dCat-EDT-TTF)(2). Despite antiferromagnetic exchange coupling at 80-100 K, we observed no sign of antiferromagnetic order down to 50 mK owing to spin frustration on the triangular lattice. In addition, we found nearly temperature-independent susceptibility below 3 K associated with Pauli paramagnetism. These observations suggest the development of gapless quantum spin liquid as the ground state. On the basis of a comparative discussion, we point out that the gapless quantum spin liquid states in organic systems share a possible mechanism, namely the formation of a band with a Fermi surface possibly attributed to spinons.

引用

页数：5

共 50 条

[11] Anisotropic magnetic order of the Eu sublattice in single crystals of EuFe2-xCoxAs2 (x=0,0.2) studied by means of magnetization and magnetic torque [J].