Field-tunable quantum disordered ground state in the triangular-lattice antiferromagnet NaYbO2

被引：202

作者：

Bordelon, Mitchell M. ^{[1
]}

Kenney, Eric ^{[2
]}

Liu, Chunxiao ^{[3
]}

Hogan, Tom ^{[4
]}

Posthuma, Lorenzo ^{[1
]}

Kavand, Marzieh ^{[5
,6
]}

Lyu, Yuanqi ^{[5
,6
]}

Sherwin, Mark ^{[5
,6
]}

Butch, N. P. ^{[7
]}

Brown, Craig ^{[7
,8
]}

Graf, M. J. ^{[2
]}

Balents, Leon ^{[9
]}

Wilson, Stephen D. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA

[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA

[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[4] Quantum Design Inc, San Diego, CA USA

[5] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[6] Univ Calif Santa Barbara, Ctr Terahertz Sci & Technol, Santa Barbara, CA 93106 USA

[7] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[8] Univ Delaware, Dept Chem & Biomol Engn, Newark, DE USA

[9] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

来源：

NATURE PHYSICS | 2019年 / 15卷 / 10期

基金：

美国国家科学基金会;

关键词：

MAGNETIC-PROPERTIES; HEISENBERG-ANTIFERROMAGNET;

D O I：

10.1038/s41567-019-0594-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Antiferromagnetically coupled S = 1/2 spins on an isotropic triangular lattice are the paradigm of frustrated quantum magnetism, but structurally ideal realizations are rare. Here, we investigate NaYbO2, which hosts an ideal triangular lattice of effective J(eff) = 1/2 moments with no inherent site disorder. No signatures of conventional magnetic order appear down to 50 mK, strongly suggesting a quantum spin liquid ground state. We observe a two-peak specific heat and a nearly quadratic temperature dependence, in agreement with expectations for a two-dimensional Dirac spin liquid. Application of a magnetic field strongly perturbs the quantum disordered ground state and induces a clear transition into a collinear ordered state, consistent with a long-predicted up-up-down structure for a triangular-lattice XXZ Hamiltonian driven by quantum fluctuations. The observation of spin liquid signatures in zero field and quantum-induced ordering in intermediate fields in the same compound demonstrates an intrinsically quantum disordered ground state. We conclude that NaYbO2 is a model, versatile platform for exploring spin liquid physics with full tunability of field and temperature.

引用

页码：1058 / +

页数：8

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