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Large Negative Quantum Renormalization of Excitation Energies in the Spin-1/2 Kagome Lattice Antiferromagnet Cs2Cu3SnF12

Toshio Ono, Kittiwit Matan, Yusuke Nambu, Taku J. Sato, Kazuya Katayama, Satoshi Hirata, Hidekazu Tanaka
2014 Journal of the Physical Society of Japan  

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2013 pre-print arXiv:1311.1875v1 fatcat:63a4uh37dfgjde7g45anxjilke

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2014 accepted
arXiv:1311.1875v2 fatcat:d44pcxviknfvnfb3oabiklxipm
Magnetic excitations in the spin-1/2 distorted kagome lattice antiferromagnet Cs_2Cu_3SnF_12, which has an ordered ground state owing to the strong Dzyaloshinskii-Moriya interaction, were studied using inelastic neutron scattering. Although the spin-wave dispersion can be qualitatively understood in terms of linear spin-wave theory (LSWT), the excitation energies are renormalized by a factor of approximately 0.6 from those calculated by LSWT, almost irrespective of the momentum transfer. This
more » ... adequacy of LSWT, which is attributed to quantum fluctuations, provides evidence of negative quantum renormalization in the spin-1/2 kagome lattice antiferromagnet.
doi:10.7566/jpsj.83.043701 fatcat:qltuc2pj4fexrkmz2jhdqastwy
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Toshio Ono, Kittiwit Matan, Yusuke Nambu, Taku J. Sato, Kazuya Katayama, Satoshi Hirata, Hidekazu Tanaka. "Large Negative Quantum Renormalization of Excitation Energies in the Spin-1/2 Kagome Lattice Antiferromagnet Cs2Cu3SnF12." Journal of the Physical Society of Japan 83.4 (2014) 043701