Electronic properties in itinerant ferromagnet SrRu1−xTixO3

Here, we study the electrical transport and specific heat in 4d based ferromagnetic material SrRuO3 and its Ti substituted SrRu1−xTixO3 series (x ⩽ 0.7). The SrRuO3 is a metal and shows itinerant ferromagnetism with transition temperature Tc ∼ 160 K. The nonmagnetic Ti4+ (3d0) substitution would not...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-07, Vol.32 (28)
Main Authors: Gupta, Renu, Rawat, R, Pramanik, A K
Format: Article
Language:English
Subjects:
electrical resistivity
electronic correlation
magnetoresistance
specific heat
transition metal oxides
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Summary:Here, we study the electrical transport and specific heat in 4d based ferromagnetic material SrRuO3 and its Ti substituted SrRu1−xTixO3 series (x ⩽ 0.7). The SrRuO3 is a metal and shows itinerant ferromagnetism with transition temperature Tc ∼ 160 K. The nonmagnetic Ti4+ (3d0) substitution would not only weaken the active Ru-O-Ru channel but is also expected to tune the electronic density and electron correlation effect. A metal to insulator transition has been observed around x ∼ 0.4. The nature of charge transport in paramagnetic-metallic state (x ⩽ 0.4) and in insulating state (x > 0.4) follows modified Mott's variable range hopping model. In ferromagnetic-metallic state, resistivity shows a T2 dependence below Tc which though modifies to T3/2 dependence at low temperature. In Ti substituted samples, temperature range for T3/2 dependence extends to higher temperature. Interestingly, this T3/2 dependence dominates in whole ferromagnetic regime in presence of magnetic field. This evolution of electronic transport behavior can be explained within the framework of Fermi liquid theory and electron-magnon scattering mechanism. The negative magnetoresistance exhibits a hysteresis and a crossover between negative and positive value with magnetic field which is connected with magnetic behavior in series. The decreasing electronic coefficient of specific heat with x supports the increasing insulating behavior in present series. We calculate a high Kadowaki-Woods ratio (x ⩽ 0.3) for SrRuO3 which increases with substitution concentration. This signifies an increasing electronic correlation effect with substitution concentration.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab7f08