Reference : A sharp decrease of resistivity in La0.7Ca0.3Mn0.96Cu0.04O3: Evidence for Cu-assisted...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
A sharp decrease of resistivity in La0.7Ca0.3Mn0.96Cu0.04O3: Evidence for Cu-assisted coherent tunneling of spin polarons
Sergeenkov, S. A. [> > > >]
Bougrine, Hassan mailto [Université de Liège - ULiège > CARE "Le Réseau des bibliothèques" > Bibliothèque des Sciences et Techniques >]
Ausloos, Marcel mailto [Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S. >]
Cloots, Rudi mailto [Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale - Doyen de la Faculté des Sciences >]
JETP Letters
Springer Science & Business Media B.V.
Yes (verified by ORBi)
[en] Nearly a 50% decrease of the resistivity rho(T,x) is observed upon just 4% Cu doping at the Mn site of La2/3Ca1/3Mn1-xCuxO3. When the observed phenomenon is attributed to a decrease of the spin-polaron energy E-sigma(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 M2(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{T-[root(C)(x)/T](2)-1}. The best fits through all the data points suggest M-0(x)similar or equal to root 1-xM(0)(0), M-R(x)similar or equal to x root M-0(0), and E-sigma(x)similar or equal to E-sigma(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-sigma(0)=0.12 eV. (C) 1999 American Institute of Physics. [S0021-3640(99)00811-7].

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