Journal
NATURE PHYSICS
Volume 6, Issue 11, Pages 865-869Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1761
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Funding
- JSPS
- MEXT Japan
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Determining ground states of correlated electron systems is fundamental to understanding unusual phenomena in condensed-matter physics. A difficulty, however, arises in a geometrically frustrated system in which the incompatibility between the global topology of an underlying lattice and local spin interactions gives rise to macroscopically degenerate ground states(1), potentially prompting the emergence of quantum spin states, such as resonating valence bond(2-7) and valence-bond solid(8-11) (VBS). Although theoretically proposed to exist in a kagome lattice-one of the most highly frustrated lattices in two dimensions being comprised of corner-sharing triangles-such quantum-fluctuation-induced states have not been observed experimentally. Here we report the first realization of the 'pinwheel' VBS ground state in the S = 1/2 deformed kagome lattice antiferromagnet Rb(2)Cu(3)SnF(12) (refs 12,13). In this system, a lattice distortion breaks the translational symmetry of the ideal kagome lattice and stabilizes the VBS state.
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