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- W2000980758 abstract "A magnetic phase transition is induced by magnetic field in a Haldane gap system ${text{Y}}_{2}{text{BaNi}}_{1ensuremath{-}y}{text{Mg}}_{y}{text{O}}_{5}$, where nonmagnetic Mg dopants cut an infinite chain into finite segments randomly. The ordering is realized only for field direction parallel to the $c$ axis and above a critical field ${ensuremath{mu}}_{0}{H}_{text{c}}ensuremath{sim}2text{ }text{T}$, which is much smaller than the Haldane gap of ${text{Y}}_{2}{text{BaNiO}}_{5}$ $(ensuremath{sim}70text{ }text{T})$. The phenomenon is correlated with the field-induced energy-level crossing of the eigenstates for coupled edge spins at both ends of each segment. Although the crossing field depends on the length of the segments, macroscopic ordering is realized." @default.
- W2000980758 created "2016-06-24" @default.
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- W2000980758 date "2010-09-09" @default.
- W2000980758 modified "2023-10-01" @default.
- W2000980758 title "Magnetic-field-induced phase transition of coupled edge spins in the Haldane gap systemY2BaNi1−yMgyO5" @default.
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- W2000980758 doi "https://doi.org/10.1103/physrevb.82.100407" @default.
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