Lattice effect on the magnetic and magneto-transport properties of (La1/3Sm2/3)0.67Ba0.33−xSrxMnO3 (x=0.0, 0.1, 0.2 and 0.33) compounds

Electron paramagnetic resonance study of (La0.33Sm0.67)0.67Sr0.33−Ba MnO3 (x<0.1): Griffiths phase

“…As reported previously [1][2][3][4], the magnetic properties and conductivity behavior of the manganite sample (La 0.33 Sm 0.67 ) 0.67 Sr 0.33À x Ba x MnO 3 , with x¼0.0, containing no Ba 2 þ ions, characterized by the phase-transition temperature T C ¼205 K, are significantly different from those of the samples containing rather large amount of Ba ions, with x¼0.13, 0.23, and 0.33, characterized by T C ¼ 127 K, 112 K, and 96 K, respectively [1]. This indicates that T C decreases sharply from 205 to 127 K for a rather small Ba doping of x¼0.…”

“…13, and then only to 96 K for Ba doping with the largest possible amount of x¼0.33. In addition, the resistivity changed from 10 À 1 O cm for (La 0.33 Sm 0.67 ) 0.67 Sr 0.33 MnO 3 at 100 K to about 10 3 O cm for all other samples (x¼0.13, 0.23, 0.33) [1]. Thus, significant differences in magnetic and charge-transfer properties were observed in samples with Ba doping of (La 0.33 Sm 0.67 ) 0.67 Sr 0.33À x Ba x MnO 3 .…”

Structural properties and electrical resistivity of Na-substituted lanthanum manganites: La1−xNaxMnO3+y (x=0.1, 0.125 and 0.15)

“…A op is defined analogously to equation (3). Thus, the phonon resistivity can be conveniently modeled by combining both terms arising from acoustic and optical phonons…”

“…The metal-insulator transition observed near the Curie temperature results colossal magnetoresistance (CMR) as defined in terms of sharp decrease of the electric resistance of manganites under external magnetic field [1,2]. The CMR materials have been focused due to many fold reasons: the comprehension of basic phenomena related to the CMR effect, the optimization of known compounds, and synthesis of new materials with the aim of enhancing and tuning their physical properties [3,4].…”

Magnetocaloric effect and magnetic properties of La0.75Ba0.1M0.15MnO3 (M=Na, Ag and K) perovskite manganites

“…These authors found that the enhancement of both 2 and r A leads to a decrease of T C . Moreover, Asthana et al [27] have shown that the size variance 2 influences not only the T C value but also the low temperature metallic phase in (La 1/3 Sm 2/3 ) 0.67 Ba 0.33−x Sr x MnO 3 samples and the conventional metal-insulator transition (T MI ) observed at low mismatch values turns into different transport behavior below T MI . For our three samples, in the paramagnetic region, the temperature dependence of the magnetic susceptibility obeys the Curie-Weiss law = C/(T −  P ), where C is the Curie constant and  P is the Curie-Weiss temperature.…”