Effects of Cr substitution on the magnetic and transport properties and electronic states ofSrRuO3epitaxial thin films

Abstract

The effect of Cr substitution in a SrRuO 3 epitaxial thin film on SrTiO 3 substrate was investigated by measuring the magnetic and transport properties and the electronic states. The ferromagnetic transition temperature of the SrRu 0.9 Cr 0.1 O 3 film (166 K) was higher than that of the SrRuO 3 film (147 K). Resonant photoemission spectroscopy experimentally revealed that the Cr 3dt 2g orbital is hybridized with the Ru 4dt 2g orbital in the SrRu 0.9 Cr 0.1 O 3 film, supporting the assumption that the enhancement of the ferromagnetic transition temperature through Cr substitution stems from the widening of energy bands due to the hybridization of Cr 3dt 2g and Ru 4dt 2g orbitals.Furthermore, we found that the Hall resistivity of the SrRu 0.9 Cr 0.1 O 3 film at low temperature is not a linear function of magnetic field in the high-field region where the out-of-plane magnetization was saturated; this result suggests that the SrRu 0.9 Cr 0.1 O 3 film undergoes a structural transition at low temperature accompanied with the modulation of the Fermi surface.

High-spin state and magnetic coupling induced through interfacial orbital reconstruction observed in SrRuO3/LaNiO3 superlattice

“…To obtain further insight into this magnetic behavior, the temperature dependences of the magnetization of the samples after FC were measured under an out-of-plane 7 can be attributed to correlation effects caused by the strongly hybridized p and d orbitals across the interface [21]. A robust exchange interaction has been demonstrated to mediate both the Ru valence states and the orbital occupancy induced by orbital reconstruction [22].…”

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

“…It was reported that 10% Cr-doped SRO can increase T C to 188 K. 30 And the enhanced T C is attributable to broaden bandwidth due to the hybridization between Cr 3d and Ru 4d. 31 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.…”

Spectroscopic and theoretical investigation of the electronic states of layered perovskite oxyfluoride Sr2RuO3F2 thin films

“…Doping of 10% of cations containing e g electrons, such as Mn 3+ , Co 2+ , Ni 2+ , Cu 2+ , and Zn 2+ , into SrRuO 3 decreased the T C to 105 K [6,7], due to the narrowing of the Ru 4dt 2g band induced by the local distortion of RuO 6 octahedra associated with the doping of ions larger than Ru 4+ and the destructive interaction between the Ru t 2g bands via the e g electrons of the doped cations [6]. In contrast, substitution of 10% Cr 3+ , which contains only t 2g electrons, increased the T C to 188 K [6,[8][9][10][11], owing to the widening of the energy bands due to the hybridization of Cr 3dt 2g and Ru 4dt 2g orbitals [12].…”