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• W1645795498 abstract "We have performed measurements of dc electrical resistivity ρ(T), magnetic susceptibility χ(T), and impedance spectroscopy Z(T, ω) in both single crystals and polycrystalline samples of Nd0.5Ca0.5Mn1−xCrxO3 (0.00⩽x⩽0.07). The pristine compound exhibits a transition to a charge ordered (CO) state at TCO∼250 K. However, no evidence of either metal-insulator (MI) or ferromagnetic (FM) transitions are observed at lower temperatures. The substitution of Mn by Cr partially suppresses the CO transition and induces a FM/MI ordering at lower temperatures TC=TMI∼140 K, which is essentially Cr independent. Both ρ(T) and χ(T) measurements indicate the development of a ferromagnetic (FM) component at low temperatures T&lt;TMI that gradually increases with increasing Cr content. The ρ(T) and χ(T) data also revealed irreversibility at temperatures T&lt;TCO suggesting a coexistence of different phases. In addition, the Z(T,ω) curves close to TMI exhibit a clear relaxation process. The specific capacitances calculated from the Z(T,ω) curves have a percolation-like behavior, characteristic of a metal-insulator transition in samples comprised of two phases." @default.
• W1645795498 created "2016-06-24" @default.
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• W1645795498 date "2003-05-09" @default.
• W1645795498 modified "2023-09-26" @default.
• W1645795498 title "Phase coexistence in Cr-doped Nd0.5Ca0.5MnO3 compounds" @default.
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• W1645795498 doi "https://doi.org/10.1063/1.1540181" @default.
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