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Chotoku, M.,Nojima, T.,Ochiai, A.,Aoki, H.,Lee, H.G.,Lee, S.I. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
We have performed the detailed measurements of temperature dependence of magnetization M(T) on MgB<SUB>2</SUB> single crystals in a wide range of field H using torque magnetometry. In a field region, where the peak effect in M(H) is observed, we find that M(T) of the warming branch increases monotonously with T and exhibits a small step-like increase at T<SUB>1</SUB><SUP>*</SUP>, which is related to the order-disorder transition, while M(T) of the cooling branch, showing the larger values than that in warming branch below T<SUB>1</SUB><SUP>*</SUP>, drops suddenly toward the warming branch at T<SUB>2</SUB><SUP>*</SUP>. We ascribe this anomalous behavior of M(T) of the cooling branch to a supercooling phenomenon of disordered phase, which transforms to the ordered state at T<SUB>2</SUB><SUP>*</SUP>.