Study of Nontrivial Magnetism in 3$d$-5$d$ Transition Metal based Double Perovskites

Abstract

The coexistence of the strongly correlated 3$d$ transition metal (TM) atom and the strong spin-orbit coupling (SOC) of 5$d$ TM atom is potential to host exotic physical phenomena. In the present work, we have studied the magnetism resulting from such a coexistence in La${}_2$CoIrO${}_6$ (LCIO), a representative of bulk 3$d$-5$d$ double perovskites. In order to gain further insight into the effect of Co-$d$ states on the Ir-$d$ states, comparisons are carried out with the isostructural La${}_2$ZnIrO${}_6$, where nonmagnetic Zn atom replaces the Co atom. An in-depth analysis of the magnetic states in the framework of first principles calculation, using Landau theory and magnetic multipole analysis shows that the magnetism at the two constituent TM atoms in LCIO are driven by two different magnetic order parameters, viz., the spin moment as the primary order parameter responsible for the broken time-reversal state in Co and the higher order multipole: triakontadipole for the Ir magnetic state. A tight-binding analysis with the Ir-$t_{2g}$ orbitals, further, indicate that the Ir-$d$ states are hardly affected by the Co-$d$ states, in agreement with the multipole analysis. The computed heirarchy of the relevant multipoles in the present work can be probed in neutron diffraction measurements, motivating further experiments in this direction.

arXiv comment10 pages, 5 figures (Accepted in Phys. Rev. B)

References in corpus (13)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Mott physics and band topology in materials with strong spin-orbit interaction
• Muffin Tin Orbitals of Arbitrary Order
• The magnetic and crystal structures of Sr2IrO4: A neutron diffraction study
• Dirac nodal lines and induced spin Hall effect in metallic rutile oxides
• Effective J=1/2 insulating state in Ruddlesden-Popper iridates: An LDA+DMFT study
• Emerging magnetism and anomalous Hall effect in iridate-manganite heterostructures
• Multipole decomposition of LDA+$U$ energy and its application to actinides compounds
• Magnetism and electronic structure of La2ZnIrO6 and La2MgIrO6: candidate Jeff =1/2 Mott insulators
• Magnetism and spin-orbit coupling in Ir-based double perovskites La${}_{(}2-x$Sr${}_x$CoIrO${}_6$
• Theory of Large Intrinsic Spin Hall Effect in Iridate Semimetals
• Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates
• Landau Potential for Multiferroic Mn_2GeO_4

Cited by in corpus (7)

• Spin-orbit effects in pentavalent Iridates: Models and materials
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Structural, electronic and magnetic properties of La${}_{1.5}$Ca${}_{0.5}$(Co${}_{0.5}$Fe${}_{0.5}$)IrO${}_6$ double perovskite
• The 3d and 5d electronic structures and orbital hybridization in Ba- and Ca-doped La2CoIrO6 double perovskite
• The Co${}^{2+}$-Ir${}^{5+}$ orbital hybridization in LaCaCoIrO${}_6$ double perovskite
• Tuning Magnetic and Electronic Properties of Double Perovskite La${}_2$CoIr${}_{1-x}$Ti${}_x$O${}_6$