Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-01-11
JETP Lett. 70, 141 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages (REVTEX), 2 PS figures (epsf.sty); submitted to Phys.Rev.B
Scientific paper
10.1134/1.568143
Colossal negative magnetoresistance \Delta \rho (T,B) observed in La(0.6)Y(0.1)Ca(0.3)MnO(3) at B=1T shows a nearly perfect symmetry around T_0=160K suggesting a universal field-induced transport mechanism in this material. Attributing this symmetry to strong magnetic fluctuations (triggered by the Y substitution and further enhanced by magnetic field, both above and below the field-dependent Curie temperature T_C(B)=T_0), the data are interpreted in terms of the nonthermal spin hopping and magnetization M dependent charge carrier localization scenario leading to \Delta \rho (T,B)= -\rho_s(1-exp(-\gamma M^2)) with M(T,B)=CB/|T-T_C|^n. The separate fits through all the data points above and below T_C yield C^{+}\simeq C^{-} and n^{+}\simeq n^{-}\simeq 1. The obtained results corroborate the importance of fluctuation effects in this material recently found (cond-mat/9812219) to dominate its magneto-thermopower behavior far beyond T_C.
Ausloos Marcel
Bougrine H.
Gilabert A.
Sergeenkov Sergei
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