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Report No.

Quantum phase transition of spin nanotube

Sakai, Toru; Okunishi, Koichi*; Otsuka, Yuichi*; Okamoto, Kiyomi*; Sato, Masahiro*; Itoi, Chigaku*

The spin nanotube was theoretically investigated by the numerical exact diagonalization and the density matrix renormalization group method. It was found that the three-leg spin tube exhibits a quantum phase transition between the spin gap and gapless phases, as a lattice distortion occurs. The superconductivity induced by the spin gap is also discussed.



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