Site dilution and charge disorder effect on physical properties in SrRu_1−x Ga _x O₃

Abstract

Here, we report an evolution of structural, magnetic and transport behavior in doped SrRu 1−x Ga x O 3 (x 0.2). The nonmagnetic dopant Ga 3+ (3d 10 ) not only acts for magnetic site dilution in SrRuO 3 but also modifies the Ru charge state and electronic density. Our studies show that Ga 3+ substitution does not affect the original orthorhombic-Pbnm structure of SrRuO 3 which is due to its matching ionic radii with Ru 4+ . However, Ga 3+ has a substantial effect on the magnetic behavior of SrRuO 3 where it decreases both magnetic moment as well as magnetic transition temperature T c . Further, this dilution induces Griffiths phase behavior across T c and cluster-glass behavior at low temperature with higher concentration of doping. The magnetic critical exponent β increases with x due to this site dilution effect. The Ga 3+ induces an insulating state in SrRuO 3 with x > 0.05. The charge transport in paramagnetic as well as in insulating state of samples can be well described with Mott's modified variablerange-hopping model. The metallic charge transport just below T c in SrRuO 3 obeys Fermi liquid behavior which breaks down at low temperature. We further find a correlation between field dependent magnetoresistance and magnetization through power-law behavior over the series.

Electronic properties in itinerant ferromagnet SrRu1−x Ti x O3

“…[20,21] The critical analysis of this PM-FM transition has shown a mean-field like magnetic interaction in SrRuO 3 . [13,14,5,6,22,23] The right axis of Fig. 1 shows temperature dependent electrical resistivity ρ(T ) of SrRuO 3 , measured in 0 and 8 T magnetic field.…”

Suppression of magnetic phase transition at high magnetic field and non-Debye's nature of nano-crystalline Gd$_2$CoMnO$_6$: a detail study of physical properties

“…The goodness of fit χ 2 and R wp /R exp ratio as 1.67 and 1.2487 respectively are acceptable and in agreement with literature. [27][28][29][30] The crystal structure of Gd 2 CoMnO 6 is monoclinic with space group is P2 1 /n. The lattice parameters obtained from structural analysis a, b and c are 5.2755 Å, 5.5616 Å and 7.5212 Å respectively.…”

Structure, magnetic and dielectric properties in nano-crystalline Yb2CoMnO6

“…A peak like behavior around T c is observed in M ZFC curve and with further decreasing temperature the M ZFC began to decrease, such type of behavior is seen in many perovskite compounds. [15,16,25,26,27,28,29] Whereas M FC continuously increases with decreasing temperature. However, at low temperature below ∼15 K there appears a peak in M FC and M ZFC which is related to the ordering of Yb 3+ ions at low temperature.…”