Site dilution in SrRuO₃: effects on structural and magnetic properties

Abstract

We have investigated the effect of site dilution with substitution of nonmagnetic element in SrRu Ti O (x ⩽ 0.7). The nature of ferromagnetic state in SrRuO is believed to be of itinerant type with transition temperature [Formula: see text] K. Crystallographically, SrRuO has a distorted orthorhombic structure. Substitution of [Formula: see text] (3d ) for Ru (4d ), however, does not introduce significant structural modification due to their matching ionic radii. This substitution, on the other hand, is expected to tune the electronic correlation effect and the d electron density in the system. With Ti substitution, we find that magnetic moment and Curie temperature decreases but T remains unchanged which has been attributed to opposite tuning of electron correlation effect and density of states within the framework of itinerant ferromagnetism. The estimated critical exponent (β) related to magnetization implies a mean-field type of magnetic nature in SrRuO. The value of β further increases with x which is understood from the dilution effect of magnetic lattice. The system evolves to exhibit Griffiths phase like behavior above T which is usually realized in diluted ferromagnet following local moment model of magnetism. Our detail analysis of magnetization data indicates that magnetic state in SrRuO has contribution from both itinerant and local moment model of magnetism.

Electronic properties in itinerant ferromagnet SrRu1−x Ti x O3

“…The details of samples preparation and characterization of ingredients and temperature used have been discussed elsewhere. [13,14] Temperature and field dependent magnetic measurements have been done using SQUID. Further, the dc electrical resistivity ρ(T ) and magnetoresistance (MR) data are collected using a home-built setup attached with Oxford superconducting magnet by following the four probe technique, in the temperature.…”

Magnetic and transport properties of Ba and Co co-doped SrRuO3

“…While for the Co substitution in our SBRCO and SRCO sample, both the magnetic moment and T c decreases. In the previous study reported by Gupta et al,24 with Ti substitution at Ru site, the magnetic moment decreases but T c remains unchanged. Among the previously other doped transition metal such as Mn, 25 Fe, 26 and Cr 27 etc., the enhancement of T c is only for Cr substitution.…”

Ferromagnetic insulating behavior at low temperature induced by Sn doping in the ceramic SrRuO3

“…32 In SrRu 1−x Ti x O 3 , the T C remains unchanged with Ti substitution, whereas Weiss temperature and magnetic moment continually decreases. 33 Because of the similar ionic radius of Ru 4+ (0.62 Å) and Sn 4+ (0.69 Å) ions, 34 Sn doping at Ru site in SRO is quite feasible. It has been reported that the epitaxial SrRu 0.48 Sn 0.52 O 3 thin film exhibits an excellent lattice match with (100)-oriented KTaO 3 .…”

“…The substitution of Mn ions for Ru ions causes many interesting physical phenomena, such as FM, spin‐glass, anti‐FM, and mixed‐valent behavior 32 . In SrRu 1− x Ti x O 3 , the T C remains unchanged with Ti substitution, whereas Weiss temperature and magnetic moment continually decreases 33 …”