Oscillations of kinks on dislocation lines in crystals and low-temperature transport anomalies as a “passport” of newly-induced defects

Межов-Деглин, Л. П.; Mukhin, S. I.

doi:10.1063/1.3670021

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Quantum diffusion was first discovered for dilute point defects in bulk quantum crystals, using nuclear magnetic resonance spectroscopy [4][5][6] . While similar physics is also expected to govern the transport of point topological defects like kinks in a dislocation 7 , to our knowledge, these predictions have never been confirmed experimentally 29 . Even if they were, due to the long-range nature of the deformation associated with bulk dislocations, we do not expect simple models studied in Sec.…”

Section: A Bulk and Surface Lattice Defectsmentioning

confidence: 75%

Dephasing with strings attached

et al. 2018

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Motivated by the existence of mobile low-energy excitations like domain walls in one dimension or gauge-charged fractionalized particles in higher dimensions, we compare quantum dynamics in the presence of weak Markovian dephasing for a particle hopping on a chain and for an Ising domain wall whose motion leaves behind a string of flipped spins. Exact solutions show that the two models have near identical transport responses in the bulk. On the other hand, in finite-length chains, the broadening of discrete spectral lines is much more noticeable in the case of a domain wall. These results may be of relevance to a broad class of systems including quasi-1D antiferromagnets, polymer chains, and even retinal systems.

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Section: A Bulk and Surface Lattice Defectsmentioning

confidence: 75%

Dephasing with strings attached

et al. 2018

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“…But, only long after the end of 'Perestroika' we had met again with Prof. Mezhov-Deglin and, in that time my Dutch PhD student, Jan van Ostaay at the quiet Chernogolovka premises in the autumn of 2011 and decided to revitalise the investigation of the kink scenario, but now also for the description of the thermal transport anomalies in the crystals with dominating phonon rather than electron thermal flow 3,4 . This ignited our most recent activities 5,6 . The present work is a new logic step in the ongoing research.…”

Section: Introductionmentioning

confidence: 99%

“…The phonon thermal transport anomaly at low temperature was demonstrated by experiments in the deformed (bent) superconducting lead samples 2 and in helium-4 crystals 3,4 and was ascribed to the dislocation dynamics. Previously, we had discussed semi-qualitatively the phonon-kink scattering effects on the thermal conductivity of insulating crystals in a series of papers 5,6 . In this work it is demonstrated explicitly that exponent of the power low in the temperature dependence of the phonon thermal conductivity depends, due to kinks, on the distribution of the random elastic stresses in the crystal, that pin the kinks motion along the dislocation lines.…”

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confidence: 99%

Phonon-kink scattering effect on the low-temperature thermal transport in solids

Ostaay

Mukhin

2018

Low Temperature Physics

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We consider contribution to the phonon scattering, in the temperature range of 1K, by the dislocation kinks pinned in the random stress fields in a crystal. The effect of electron-kink scattering on the thermal transport in the normal metals was considered much earlier 1 . The phonon thermal transport anomaly at low temperature was demonstrated by experiments in the deformed (bent) superconducting lead samples 2 and in helium-4 crystals 3,4 and was ascribed to the dislocation dynamics. Previously, we had discussed semi-qualitatively the phonon-kink scattering effects on the thermal conductivity of insulating crystals in a series of papers 5,6 . In this work it is demonstrated explicitly that exponent of the power low in the temperature dependence of the phonon thermal conductivity depends, due to kinks, on the distribution of the random elastic stresses in the crystal, that pin the kinks motion along the dislocation lines. We found that one of the random matrix distributions of the well known Wigner-Dyson theory is most suitable to fit the lead samples experimental data 2 . We also demonstrate that depending on the distribution function of the oscillation frequencies of the kinks, the power low temperature dependences of the phonon thermal conductivity, in principle, may possess exponents in the range of 2 ÷ 5.

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