Infrared optical properties of the spin-1/2 quantum magnet $TiOCl$

Abstract

We report results on the electrodynamic response of $TiOCl$, a low-dimensional spin-1/2 quantum magnet that shows a spin gap formation for T$<T_{c1}$= 67 $K$. The Fano-like shape of a few selected infrared active phonons suggests an interaction between lattice vibrations and a continuum of low frequency (spin) excitations. The temperature dependence of the phonon mode parameters extends over a broad temperature range well above $T_{c1}$, indicating the presence of an extended fluctuation regime. In the temperature interval between 200 $K$ and $T_{c1}$ there is a progressive dimensionality crossover (from two to one), as well as a spectral weight shift from low towards high frequencies. This allows us to identify a characteristic energy scale of about 430 $K$, ascribed to a pseudo spin-gap.

References in corpus (12)

• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• Magnetic light scattering in low-dimensional quantum spin systems
• NaV_2O_5 as a quarter-filled ladder compound
• S=1/2 chains and spin-Peierls transition in TiOCl
• Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models
• Charged Magnons in NaV2O5
• Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR
• Numerical Study of the One-Dimensional Spin-Orbit Coupled System with SU(2)$\otimes$SU(2) Symmetry
• Fano effect in the $a-b$ plane of Nd${}_{1.96}$Ce${}_{0.04}$CuO${}_{4+y}$: evidence of phonon interaction with a polaronic background
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• Infrared signatures of the spin-Peierls transition in CuGeO3
• Elementary excitations in one-dimensional spin-orbital models: neutral and charged solitons and their bound states

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• Strong Magneto-elastic coupling in VOCl: Neutron and synchrotron powder x-ray diffraction study
• Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr
• Giant phonon anomalies in the pseudo-gap phase of TiOCl
• Heat capacity of the quantum magnet TiOCl
• Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
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• Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl
• Symmetry disquisition on the TiOX phase diagram
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• Analysis of the phonon spectrum in the titanium oxyhalide TiOBr
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• Density functional study of the electronic and vibrational properties of TiOCl
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• Lattice and orbital fluctuations in TiPO4
• High pressure x-ray study of spin-Peierls physics in the quantum spin chain material TiOCl
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