Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-21
Nature Physics 6, 865-869 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 4 figures and Supplemental Information
Scientific paper
10.1038/nphys1761
Determining ground states of correlated electron systems is fundamental to understanding novel 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, potentially prompting the emergence of quantum spin states, such as resonating valence bond (RVB) and valence bond solid (VBS). Although theoretically proposed to exist in a kagome lattice -- one of the most highly frustrated lattices in two dimensions (2D) 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 Rb2Cu3SnF12. In this system, a lattice distortion breaks the translational symmetry of the ideal kagome lattice and stabilizes the VBS state.
Fukumoto Yoshihiro
Matan Kittiwit
Morita Kenji
Ono Takafumi
Sato Taku J.
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