Phase Transition between Dimerized-Antiferromagnetic and Uniform-Antiferromagnetic Phases in the Impurity-Doped Spin-Peierls Cuprate CuGeO3
T. Masuda, A. Fujioka, Y. Uchiyama, I. Tsukada, K. Uchinokura
DOI 10.1103/PhysRevLett.80.4566 · Physical Review Letters
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Abstract
We report a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in impurity-doped spin-Peierls (SP) cuprate Cu1−xMgxGeO3. As Mg concentration increases, linear reduction of the SP transition temperature ( TSP) and linear increase of the Néel temperature ( TN) are observed for x up to xc≃0.023. At xc the SP transition suddenly disappears and TN jumps discontinuously. The peak of the susceptibility at xc around TN is not as sharp as those at other concentrations, which indicates the separation of low and high concentration phases. These results indicate the existence of a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic long-range orders.
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