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arXiv · 1702.01013

Site dilution in SrRuO$_3$: Effects on structural and magnetic properties

Renu Gupta·A K Pramanik
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Abstract

We have investigated the effect of site dilution with substitution of nonmagnetic element in SrRu$_{1-x}$Ti$_x$O$_3$ ($x$ $\leq$ 0.7). The nature of ferromagnetic state in SrRuO$_3$ is believed to be of itinerant type with transition temperature $T_c$ $\sim$ 162 K. Crystallographically, SrRuO$_3$ has a distorted orthorhombic structure. Substitution of Ti$^{+4}$ (3$d^0$) for Ru$^{+4}$ (4$d^4$), 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 system. With Ti substitution, we find that magnetic moment and Curie temperature decreases but $T_c$ remains unchanged which has been attributed to opposite tuning of electron correlation effect and density of states within framework of itinerant ferromagnetism. The estimated critical exponent ($β$) related to magnetization implies a mean-field type of magnetic nature in SrRuO$_3$. 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 $T_c$ 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$_3$ has contribution from both itinerant and local moment model of magnetism.

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Renu Gupta, A K Pramanik. 2017-02-03. Site dilution in SrRuO$_3$: Effects on structural and magnetic properties. https://doi.org/10.1088/1361-648x%2Faa5532

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