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Disordered states in IPA-Cu(ClxBr1-x)3 induced by bond randomness
H Manaka1, A V Kolomiets, T Goto
1Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan. manaka@eee.kagoshima-u.ac.jp
Abstract:
The mixtures of two spin-gap compounds IPA-Cu(ClxBr1-x)3 are studied by electron paramagnetic resonance and magnetization processes [M(H)]. From electron paramagnetic resonance spectra, the symmetry of the spin-gap state breaks down, even for x=0.99. From M(H) curves for x=0.95 and 0.92, however, spin gaps survive below mu0Hc1=10+/-1 T, and the M(H) slopes bend at mu0Hc3=40+/-1 T, below the saturation field Hc2. Such a curvature suggests an exotic phase transition: Bose-Einstein condensation of spin triplets occurs at Hc1
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