Effects of dilution on magnetic and transport properties ofLa0.7Ca0.3Mn1−x

Crossover of critical behavior in La0.7Ca0.3Mn1−xTixO3

“…Third, it has been widely recognized that decrease in rate of Curie temperature due to Ti doping is very sharp at low Ti content, then for higher Ti content it flattens [7]. Moreover, recently Nam et al [8,9] found that in La 0.7 Ca 0.3 Mn 1 À x Ti x O 3 antiferromagnetic superexchange between Mn ions is significant according to a molecular-field approximation, and also the non-equilibrium dynamic behaviors are observed in La 0.7 Ca 0.3 Mn 0.925 Ti 0.075 O 3 . We desire that the study of the critical exponents for La 0.7 Ca 0.3 Mn 1 À x Ti x O 3 can provide some useful information about these interesting phenomena.…”

Crossover effect of inter-granular transport and quantum correction in Co-doping La2/3Ca1/3MnO3 manganites

“…Here, the T min increases from 34.8 K at 0 T to 45.77 K at 6 T for x¼0. 15. In this case, the applied field enhances the resistivity upturn rather than suppresses it.…”

“…15. In order to emphasize the resistivity minima at lower temperature, the normalized resistivity which is used by rate r(T)/r(T¼50 K) range from 2.5 K to 50 K at 0 T, 0.5 T and 6 T are shown in Fig.…”

“…The magnetic and transport properties can be dramatically affected due to the Mn site substitution. It is found that the substitution of Mn in ferromagnetic metal always leads to a reduction in T C and magnetization, an increase in the resistivity and finally insulating and/or cluster-glass state at low temperatures for high substitutions [14][15][16]. The low-temperature transport behavior in manganites has attracted a scientist's wide attention due to the intrinsic mechanism for the CMR system for the weakening of the lattice disturbing effect.…”

Enhanced magnetoresistance and Griffiths phase induced by Mo substitution in La0.7Ca0.15Sr0.15Mn1−xMoxO3(0 ⩽x⩽ 0.05)

“…Different effects can be produced upon Mn-site doping in FM manganites. There have been a great number of reports on the substitution effects of Mn cations by non-magnetic ions such as Al, Ti, Ga, Sc and Ta [20][21][22][23][24][25]. It has been found that doping in Mn sites with foreign elements in general destroys DE ferromagnetism in the samples, which is caused by decreasing the T C and T MI temperatures dramatically.…”