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- W3104992885 abstract "Nearly a 50% decrease of the resistivity ρ(T, x) is observed upon just 4% Cu doping at the Mn site of La2/3Ca1/3Mn1−x CuxO3. When the observed phenomenon is attributed to a decrease of the spin-polaron energy E σ(x) below T C (x), all of the data are found to be well fitted by the nonthermal coherent tunneling expression $$rho (T,x) = rho _0 e^{ - gamma M^2 (T,x)} $$ , assuming that the magnetization in the ferromagnetic state is given by the expression $$M(T,x) = M_R (x) + M_0 (x)tanh left{ {sqrt {left[ {T_C (x)/T} right]^2 - 1} } right}$$ . The best fits through all the data points suggest $$M_0 (x) simeq sqrt {1 - x} M_0 (0), M_R (x) simeq sqrt x M_0 (0)$$ and E σ(x)≃E σ(0)(1−x)4 for the explicit x dependence of the Cu-induced modifications of the Mn-spin-dominated zero-temperature spontaneous magnetization, residual paramagnetic contribution, and spin-polaron tunneling energy, respectively, with E σ(0)=0.12 eV." @default.
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- W3104992885 date "1999-06-01" @default.
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- W3104992885 title "A sharp decrease of resistivity in La0.7Ca0.3Mn0.96Cu0.04O3: Evidence for Cu-assisted coherent tunneling of spin Polarons" @default.
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- W3104992885 doi "https://doi.org/10.1134/1.568102" @default.
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