Evolution of ferrimagnetism against Griffiths singularity in calcium ruthenate

Pooja Kesarwani; Sachindra Nath Sarangi; D Samal; Chanchal Sow

doi:10.1088/1361-648X/ad3707

Evolution of ferrimagnetism against Griffiths singularity in calcium ruthenate

J Phys Condens Matter. 2024 Apr 5;36(26). doi: 10.1088/1361-648X/ad3707.

Authors

Pooja Kesarwani¹, Sachindra Nath Sarangi², D Samal^{2

3}, Chanchal Sow¹

Affiliations

¹ Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
² Institute of Physics, Bhubaneswar 751005, India.
³ Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.

PMID: 38518367
DOI: 10.1088/1361-648X/ad3707

Abstract

The magnetism in the correlated metal CaRuO₃is enigmatic as it is poised near a triple point among the ferromagnetic, antiferromagnetic, and paramagnetic ground states. Here we report a detailed work on structural, spectroscopic, magnetic, and transport properties in CaRu1-xCr_xO₃. We find that Cr doping reduces the orthorhombicity in CaRuO₃. Surprisingly, a tiny (x= 0.01) amount of Cr-doping drives the magnetic ground state from 'paramagnetic-like' to ferrimagnetic. Slightly higher Cr-doping (x= 0.05) results formation of magnetic clusters which gives rise to Griffiths singularity and power law divergence in magnetic susceptibility. The magnetism in CaRu1-xCr_xO₃is explained in terms of 'seven atom' ferrimagnetic clusters. Electrical transport shows a gradual evolution of a non-metallic state upon Cr-doping. In particular, forx⩾0.1, the temperature-dependent resistivity follows Mott-VRH conduction. The XPS study also supports significant role of disorder and electron correlation which effectively reduces the itinerant character of electrons. Finally, a new T-x phase diagram is constructed depicting the evolution of electronic and magnetic state in CaRu1-xCr_xO₃.

Keywords: correlated systems; magnetism; magnetotransport.