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• W2051208813 abstract "${mathrm{Tl}}_{2}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ pyrochlores present colossal magnetoresistance (CMR) around the long-range ferromagnetic ordering temperature ${(T}_{C}).$ The character of this magnetic phase transition has been determined to be first order, by purely magnetic methods, in contrast to the second order character previously reported by Zhao et al. [Phys. Rev. Lett. $83,$ 219 (1999)]. The highest CMR effect, as in ${mathrm{Tl}}_{1.8}{mathrm{Cd}}_{0.2}{mathrm{Mn}}_{2}{mathrm{O}}_{7},$ corresponds to a stronger first order character. This character implies a second type of magnetic interaction, in addition to the direct superexchange between the ${mathrm{Mn}}^{4+}$ ions, as well as a phase coexistence. A model is proposed, with a complete Hamiltonian (including superexchange and an indirect interaction), which reproduce the observed phenomenology." @default.
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• W2051208813 date "2002-09-16" @default.
• W2051208813 modified "2023-10-18" @default.
• W2051208813 title "First-order transition and phase separation in pyrochlores with colossal magnetoresistance" @default.
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• W2051208813 doi "https://doi.org/10.1103/physrevb.66.104412" @default.
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