Magnetic ground state and excitations in mixed 3$d$-4$d$ quasi-1D spin-chain oxide Sr${}_3$NiRhO${}_6$

Abstract

Entanglement of spin and orbital degrees of freedom, via relativistic spin-orbit coupling, in 4$d$ transition metal oxides can give rise to a variety of novel quantum phases. A previous study of mixed 3$d$-4$d$ quasi-1D spin-chain oxide Sr${}_3$NiRhO${}_6$ using the magnetization measurements by Mohapatra et al. [Phys. Rev. B 75, 214422 (2007)] revealed a partially disordered antiferromagnetic (PDA) structure below 50 K [Mohapatra et al, Phys. Rev. B 75, 214422 (2007)]. We here report the magnetic ground state and spin-wave excitations in Sr${}_3$NiRhO${}_6$, using muon spin rotation and relaxation ($\mu$SR), and neutron (elastic and inelastic) scattering techniques. Our neutron diffraction study reveals that in the magnetic structure of Sr${}_3$NiRhO${}_6$, Rh${}^{4+}$ and Ni${}^{2+}$ spins are aligned ferromagnetically in a spin-chain, with moments along the crystallographic $c$-axis. However, spin-chains are coupled antiferromanetically in the $ab$-plane. $\mu$SR reveals the presence of oscillations in the asymmetry-time spectra below 50 K, supporting the long-range magnetically ordered ground state. Our inelastic neutron scattering study reveals gapped quasi-1D magnetic excitations with a large ratio of gap to exchange interaction. The observed spin-wave spectrum could be well fitted with a ferromagnetic isotropic exchange model (with $J=3.7$ meV) and single ion anisotropy ($D=10$ meV) on the Ni${}^{2+}$ site. The magnetic excitations survive up to 85 K, well above the magnetic ordering temperature of $\sim 50$ K, also indicating a quasi-1D nature of the magnetic interactions in Sr${}_3$NiRhO${}_6$.

arXiv comment13 pages, 13 figures

References in corpus (24)

• Linear spin wave theory for single-Q incommensurate magnetic structures
• Nature of magnetism in Ca${}_3$Co${}_2$O${}_6$
• The nature of the magnetic order in Ca3Co2O6
• Magnetic behavior of Co ions in the exotic spin-chain compound,Ca3Co2O6, from 59Co NMR studies
• Superparamagnetic-like ac susceptibility behavior in a "partially disordered antiferromagnetic" compound, Ca${}_3$CoRhO${}_6$
• Slow Magnetic Order-Order Transition in the Spin Chain Antiferromagnet Ca3Co2O6
• Magnetic behaviour of quasi-one-dimensional oxides, Ca${}_3$Co${}_{(}1+x)$Mn${}_{1-x}$O${}_6$
• Impact of spin-orbit coupling on the magnetism of Sr3MIrO6 (M = Ni, Co)
• Ferromagnetic Exchange Anisotropy from Antiferromagnetic Superexchange in the Mixed 3d-5d Transition-Metal Compound Sr3CuIrO6
• Origin of the long-wavelength magnetic modulation in Ca3Co2O6
• Geometrically frustrated magnetic behavior of Sr3NiRhO6 and Sr3NiPtO6
• Evidence for the coexistence of low-dimensional magnetism and long-range order in Ca3CoRhO6
• Spin correlations in Ca3Co2O6: A polarised-neutron diffraction and Monte Carlo study
• Magnetic order in the frustrated Ising-like chain compound Sr${}_3$NiIrO${}_6$
• Heat-capacity anomalies in the presence of high magnetic fields in the spin-chain compound, Ca3Co2O6
• Anisotropic magnetodielectric coupling behavior of Ca3Co1.4Rh0.6O6 due to geometrically frustrated magnetism
• Inhomogeneous magnetism in single crystalline Sr${}_3$CuIrO${}_{6+\delta }$: Implications to phase-separation concepts
• One-Dimensional Dispersive Magnon Excitation in the Frustrated Spin-2 Chain System Ca3Co2O6
• Anisotropic interactions opposing magnetocrystalline anisotropy in Sr${}_3$NiIrO${}_6$
• Magnetic anomalies in the spin chain system, Sr${}_3$Cu${}_{1-x}$Zn${}_x$IrO${}_6$
• Sr${}_3$CuIrO${}_6$, a spin-chain compound with random ferromagnetic-antiferromagnetic interactions
• Frustrated Ising chains on the triangular lattice in Sr${}_3$NiIrO${}_6$
• Nature of the Magnetic Interactions in Sr${}_3$NiIrO${}_6$
• Non-collinear Order and Spin-Orbit Coupling in Sr${}_3$ZnIrO${}_6$