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arXiv · 1810.06846

MuSR and neutron diffraction studies on the tuning of spin-glass phase in partially ordered double perovskite SrMn$_{1-x}$W$_x$O$_3$

Poonam Yadav·Shivani Sharma·Peter J. Baker·Pabitra K. Biswas·Ivan da Silva·Niranjan P. Lalla
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Abstract

Tunability of the partially ordered double perovskite (PODP) and coexisting spin-glass phase in SrMn1-xWxO3 (x=0.20 to 0.40) have been studied using neutron powder diffraction (NPD), muon spin relaxation (MuSR), and magnetic susceptibility (X) measurements. Structural studies reveal that SrMn1-xWxO3 undergoes a quasi-continuous transformation from simple perovskite (Pm-3m) to PODP (P21/n) phase as x increases. Xdc(T) and Xac(T) measurements show a sharp cusp-like peak at a spin glass transition, Tg. The muon relaxation rate (λ) peaks at Tg following a critical growth, given by λ=λ(0).t-w [t=(T-Tg)/Tg]. However, no long-range magnetic order is observed in NPD below Tg. These measurements confirm a tunable spin-glass freezing in SrMn1-xWxO3 with Tg monotonously decreasing with W content, which we attribute to tuning the relative concentration of the coexisting Mn-O-Mn and Mn-O-W-O-Mn anti-ferromagnetic super-exchange pathways altering the geometric frustration.

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Poonam Yadav, Shivani Sharma, Peter J. Baker, Pabitra K. Biswas, Ivan da Silva, Niranjan P. Lalla. 2018-10-16. MuSR and neutron diffraction studies on the tuning of spin-glass phase in partially ordered double perovskite SrMn$_{1-x}$W$_x$O$_3$. https://doi.org/10.1103/physrevb.99.214421

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