Dependence of magnetism on GdFeO3 distortion in the t2g system ARuO3(A = Sr, Ca)

Middey, Srimanta ; Mahadevan, Priya ; Sarma, D. D. (2011) Dependence of magnetism on GdFeO3 distortion in the t2g system ARuO3(A = Sr, Ca) Physical Review B: Condensed Matter and Materials Physics, 83 (1). Article ID 014416. ISSN 2469-9950

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Official URL: http://journals.aps.org/prb/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevB.83.014416

Abstract

We have examined the stability of the ferromagnetic (FM) state in CaRuO3 and SrRuO3 as a function of the GdFeO3 distortion. Model calculations predict the dependence of the FM transition temperature (Tc) on the rotation angle θ to vary as cos2(2θ) for eg-electron systems. However, here, we find an initial increase and then the expected decrease. Furthermore, a much faster decrease is found than predicted for eg-electron systems. Considering the specific case of CaRuO3, a larger deviation of the Ru-O-Ru angle from 180∘ in CaRuO3 as compared to SrRuO3 should result in a more reduced bandwidth, thereby making the former more correlated. The absence of long-range magnetic order in the more correlated CaRuO3 is traced to the strong collapse of various exchange interaction strengths that arises primarily from the volume reduction and increased distortion of the RuO6 octahedra network that accompanies the presence of a smaller ion at the A site.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:102979
Deposited On:02 Feb 2018 03:55
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