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Paper detail

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

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.

preprint2012arXivOpen access
Mehmet Fatih CetinPeter LemmensVladimir GnezdilovDirk WulferdingDirk MenzelTomohiro TakayamaKei OhashiHidenori Takagi
cond-mat.supr-concond-mat.str-el
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Mehmet Fatih CetinPeter LemmensVladimir GnezdilovDirk WulferdingDirk MenzelTomohiro TakayamaKei OhashiHidenori Takagi

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