Effect of Cr-doping on thermal transport property in perovskite R0.7A0.3Mn1−xCrxO3

Magnetic properties of transition metal substituted La0.85Ag0.15Mn1−yMyO3 compounds (M=Co, Cr and Al)

“…So, many researchers studied the Cr substitution in place of Mn to explore the possible double exchange FM interaction in Mn 3+ -O 2À -Cr 3+ networks. Ganguly et al [24], Sun et al [25], Wu et al [26], and Gao et al [27] carried out Cr substitution in La 2/3 Ca 1/3 MnO 3 series and found that FM T c decreases with doping concentration but rather slowly compared to Co-doped materials. For example, the T c falls from 260 K for x ¼ 0 to about 200 K for [30].…”

Comparative Study on Structural, Electrical Transport and Magnetic Properties of Cr-Doped in Charge-Ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 Manganites

“…The presence of CO and localizing the charge carrier can be suggested due to JT effect that contributes to the electron-phonon interaction [28]. Insulating behaviour can be related with JT effect as Mn 3+ is known as JT ion which is the eg electrons are localized and easier to be trapped in MnO6 octahedral, hence causing the phonon easier to be scattered by distortion [17].…”

“…The presence of CO state was suggested to be related to the presence of an equal ratio of Mn 3+ and Mn 4+ where the ions align themselves in an ordered pattern [13][14][15]. Mn site substitutions of Cr on perovskite manganites have attracted great interest as the Cr 3+ ion is iso-electronic with the Mn 4+ ion [16][17][18][19][20]. It is reported that among the different studied doping elements, Cr is the most efficient one to induce a metal insulator transition in the CO undoped insulators and leads to a much higher CMR effect [16].…”

“…It is reported that among the different studied doping elements, Cr is the most efficient one to induce a metal insulator transition in the CO undoped insulators and leads to a much higher CMR effect [16]. For example, in Nd0.7Sr0.3Mn1-xCrxO3 and La0.7Ca0.3Mn1-xCrxO3 the electrical transport behaviour shows that the metal-insulator (MI) transition shift to lower temperature and weakened gradually as the Cr content increased due to DE mechanism between Mn 3+ -O-Mn 4+ [17]. Meanwhile all samples for Cr doped up to 0.3 in compound La0.67Ca0.33Mn1-xCrxO3 exhibit a ferromagnetic-paramagnetic (FM-PM) transition with TC decreased rather slowly with increasing Cr content for x≤0.2 [18].…”