title: Field-controlled phase separation at the impurity-induced magnetic ordering in the spin-Peierls Magnet CuGeO3.
abstract: The paramagnetic fraction surviving at the impurity-induced antiferromagnetic phase transition in the spin-Peierls magnet CuGeO3 is found to increase with an external magnetic field. This effect is explained by the competition of the Zeeman interaction and of the exchange interaction of local antiferromagnetic clusters formed on the spin-gap background near impurities.
authors.affiliation: P. L. Kapitza Institute for Physical Problems RAS, 117334 Moscow, Russia. glazkov@kapitza.ras.ru
authors.forename: V N
authors.initials: VN
authors.lastname: Glazkov
authors.forename: A I
authors.initials: AI
authors.lastname: Smirnov
authors.forename: H-A Krug
authors.initials: HA
authors.lastname: von Nidda
authors.forename: A
authors.initials: A
authors.lastname: Loidl
authors.forename: K
authors.initials: K
authors.lastname: Uchinokura
authors.forename: T
authors.initials: T
authors.lastname: Masuda