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The Hall coefficient of Gd-doped La_{2/3}Ca_{1/3}MnO_3 exhibits Arrheniusbehavior over a temperature range from 2T_c to 4T_c, with an activation energyvery close to 2/3 that of the electrical conductivity. Although both the dopinglevel and thermoelectric coefficient indicate hole-like conduction, the Hallcoefficient is electron-like. This unusual result provides strong evidence infavor of small-polaronic conduction in the paramagnetic regime of themanganites.Comment: 11 pages, 4 figures, uses revtex.st

physical review letters

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Hall-Effect Sign Anomaly and Small-Polaron Conduction in(La1−xGdx<…