Field-tunable quantum disordered ground state in the triangular-lattice antiferromagnet NaYbO2
| Autor: | Tom Hogan, Marzieh Kavand, Eric Kenney, Craig M. Brown, Mitchell M. Bordelon, Leon Balents, Michael Graf, Yuanqi Lyu, Stephen D. Wilson, Lorenzo Posthuma, Chunxiao Liu, Mark S. Sherwin, Nicholas P. Butch |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnetism FOS: Physical sciences General Physics and Astronomy 01 natural sciences 010305 fluids & plasmas Magnetic field Condensed Matter - Other Condensed Matter Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Antiferromagnetism Hexagonal lattice Quantum spin liquid 010306 general physics Ground state Quantum Quantum fluctuation Other Condensed Matter (cond-mat.other) |
| Zdroj: | Nature Physics. 15:1058-1064 |
| ISSN: | 1745-2481 1745-2473 |
| DOI: | 10.1038/s41567-019-0594-5 |
| Popis: | Antiferromagnetically coupled S=1/2 spins on an isotropic triangular lattice is the paradigm of frustrated quantum magnetism, but structurally ideal realizations are rare. Here we investigate NaYbO$_2$, which hosts an ideal triangular lattice of $J_{eff}=1/2$ 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 accord 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 demonstrate an intrinsically quantum disordered ground state. We conclude that NaYbO$_2$ is a model, versatile platform for exploring spin liquid physics with full tunability of field and temperature. Comment: 14 pages, 4 figures |
| Databáze: | OpenAIRE |
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