期刊
NATURE PHYSICS
卷 6, 期 9, 页码 673-676出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1715
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资金
- MEXT, Japan [16GS0219, 18740199, 19052005, 21740255]
- Grants-in-Aid for Scientific Research [16GS0219, 19052005, 18740199, 21740255] Funding Source: KAKEN
Quantum liquids-known to be realized in He-3, He-4 and electrons in metals-generally exhibit instabilities unforeseen under classical Newtonian dynamics, such as the superfluid and superconducting transitions. Recently, a new quantum liquid, now known as the quantum spin liquid, has been discovered in frustrated antiferromagnetic spin-1/2 systems(1,2). In this state, quantum fluctuations of spins prevent classical antiferromagnetic ordering even at absolute zero, similar to the situation in the well-known quantum liquids. A fundamental question that has remained open is whether instabilities other than classical ordering can occur in a quantum spin liquid, as well as in the well-known quantum liquids. Here we demonstrate experimentally that a quantum spin liquid in an organic triangular-lattice antiferromagnet undergoes an instability involving symmetry breaking and/or topological ordering(3), possibly giving rise to a new quantum state of matter. Our result reveals a new variety of quantum-liquid instability, which might become a comparable concept to the already-known fermion-liquid instabilities (such as Bardeen-Cooper-Schrieffer pairing and Peierls instability) and boson-liquid instability (Bose-Einstein condensation).
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