Crossover from coherent to incoherent scattering in spin-orbit dominated Sr2IrO4

Abstract

Strong spin-orbit interaction in the two dimensional compound Sr2IrO4 leads to the formation of Jeff=1/2 isospins with unprecedented dynamics. In Raman scattering a continuum attributed to double spin scattering is observed. With higher excitation energy of the incident Laser this signal crosses over to an incoherent background. The characteristic energy scale of this cross over is identical to that of intensity resonance effects in phonon scattering. It is related to exciton-like orbital excitations that are also evident in resonant X-Ray scattering. The crossover and evolution of incoherent excitations are proposed to be due to their coupling to spin excitations. This signals a spin-orbit induced entanglement of spin, lattice and charge degrees of freedoms in Sr2IrO4.

20 pages, 7 figures

References in corpus (7)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8
• Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity
• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Microscopic study of spin-orbit-induced Mott insulator in Ir oxides
• Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir)

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• Crystal growth and intrinsic magnetic behavior of Sr${}_2$IrO${}_4$
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• Raman scattering study of vibrational and magnetic excitations in Sr${}_{2-x}$La${}_x$IrO${}_4$
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• Model analysis of magnetic susceptibility of Sr${}_2$IrO${}_4$ - 2D $J_{\mathrm{eff}}$ = 1/2 Heisenberg system with competing interlayer couplings
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• Direct observation of the Mott gap in strontium iridate with a scanning tunneling microscope
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• Quantum Criticality in a Layered Iridate
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• Absence of temperature-dependent phonon anomalies in Sr2IrO4 and Sr3Ir2O7
• Insulator-metal transition in deep Sr-vacant spin-orbit Mott insulator Sr2IrO4