Transport studies on La0.8−xPr0.2SrxMnO3 manganite films

Studies on charge transport in Al–doped La0.7Ca0.3Mn1−xAlxO3 manganites

“…Manganites with chemical stoichiometry A 1-x B x MnO 3 , A= La, Pr, Nd, etc and B = Ca, Sr, Ba, etc, possess interesting and interrelated properties along with strong structureproperty correlation [1,2]. Undoped manganite (x = 0.0) is antiferromagnetic insulator (AFMI) where x = 0.3 doping transforms it into ferromagnetic metal (FMM) state.…”

“…However, these properties are dependent on the local lattice distortion and mismatch between rare earth (at A -site) and alkaline elements (at B -site) [2,6,7]. Structural, transport and magnetic properties of manganites and phase transition temperatures (T P and T C ) are mainly governed by the following three factors:…”

“…Several studies report the A-site doping effects on the transport and magnetic properties of mixed valent manganites [1,2,12,13] [16]. CMR behaviour and its dependence on Cu 2+ [17] and Cr 3+ [18] substitution in manganites has been also studied.…”

“…Recently, our group has investigated ZDE polynomial low fitted to resistivity data collected 9 for La 0.8-x Pr 0.2 Sr x MnO 3 manganite films and found two magnon scattering law and higher order exponent (n) suggesting higher order spin fluctuation mechanisms responsible for the metallic charge transport in manganite films [2].…”

“…To understand the electrical charge transport mechanism responsible for the metallic behavior of these samples, we have fitted resistivity data using ZDE polynomial law having the form:  (T) =  0 +  2 T 2 +  n T n , where  0 is residual resistivity,  2 is the resistivity contributed by electron -electron, electron -phonon and electron -magnon scattering mechanism, n is the higher order term and  n is the corresponding resistivity coefficient [2]. In the present case, we have specifically fitted resistivity data in temperature range: 50 -140K for the better comparison as shown in fig.7.…”