Field-controlled phase separation at the impurity-induced magnetic ordering in the spin-Peierls magnet CuGeO3
V. N. Glazkov, A. I. Smirnov, H. -A. Krug von Nidda, A. Loidl, K. Uchinokura, T. Masuda
Abstract
The fraction of the paramagnetic phase surviving at the impurity-induced antiferromagnetic order transition of the doped spin-Peierls magnet Cu(1-x)Mg(x)GeO3 (x < 5%) is found to increase with an external magnetic field. This effect is qualitatively explained by the competition of Zeeman energy and exchange interaction between local antiferromagnetic clusters
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