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Magnetic reorientation transition in a three orbital model for Ca2RuO4-interplay of spin-orbit coupling, tetragonal
Shubhajyoti Mohapatra1, Avinash Singh1
1Department of Physics, Indian Institute of Technology, Kanpur - 208016, India.
Abstract:
Including the orbital off-diagonal spin and charge condensates in the self consistent determination of magnetic order within a realistic three-orbital model for the 4d4compound Ca2RuO4, reveals a host of novel features including strong and anisotropic spin-orbit coupling (SOC) renormalization, coupling of strong orbital magnetic moments to orbital fields, and a magnetic reorientation transition. Highlighting the rich interplay between orbital geometry and overlap, SOC, Coulomb interactions, tetragonal distortion, and staggered octahedral tilting and rotation, our investigation yields a planar antiferromagnetic (AFM) order for moderate tetragonal distortion, with easya-bplane and easybaxis anisotropies, along with small canting of the dominantlyyz,xzorbital moments. With decreasing tetragonal distortion, we find a magnetic reorientation transition from the dominantly planar AFM order to a dominantlycaxis ferromagnetic order with significantxyorbital moment.
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