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Critical Dynamics of Sound Propagation and Response Function near Phase Transitions to Incommensurate Magnetic Phases in Layered Media with a Tetragonal Structure

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Abstract

A symmetry analysis was described of possible magnetic phase transitions to incommensurate structures from the paramagnetic state in layered tetragonal crystals. The propagation was analyzed of longitudinal elastic waves near such transitions. The critical behavior was found of the longitudinal sound velocity in the FeGe2 compound, which depends on temperature in a power-law manner using the renormalization group approach. The reasons were indicated for the greatest change in the velocity of longitudinal elastic waves propagating along the [100] direction based on the theory of the crystal field in this compound. The response function has been determined near the critical point of the transition to an incommensurate phase of the type of a longitudinal spin wave.

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Funding

The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme Kvant) № 122021000038–7.

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  1. M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian, Academy of Sciences, Ekaterinburg, Russia

    V. V. Men`shenin

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  1. V. V. Men`shenin
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Correspondence to V. V. Men`shenin.

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Men`shenin, V.V. Critical Dynamics of Sound Propagation and Response Function near Phase Transitions to Incommensurate Magnetic Phases in Layered Media with a Tetragonal Structure. J Supercond Nov Magn 35, 2903–2909 (2022). https://doi.org/10.1007/s10948-022-06292-8

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  • DOI: https://doi.org/10.1007/s10948-022-06292-8

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