Journal Article Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet with √3×√3-Type Distortion --- Behavior around the Boundaries of the Intermediate Phase

Shimada, A.  ,  Nakano, H.  ,  Sakai, T.  ,  Yoshimura, K.

87 ( 3 )  , pp.034706-1 - 034706-7 , 2018-02
The S = 1/2 triangular-lattice Heisenberg antiferromagnet with distortion is investigated by the numerical-diagonalization method. The examined distortion type is √3 ×√3 . We study the case when the distortion connects the undistorted triangular lattice and the dice lattice. For the intermediate phase reported previously in this system, we obtain results of the boundaries of the intermediate phase for a larger system than those in the previous report and examine the system size dependence of the boundaries in detail. We also report the specific heat of this system, which shows a marked peak structure related to the appearance of the intermediate state.

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