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Resonance Damping of the THz-frequency Transverse Acoustic Phonon in the Relaxor Ferroelectric KTa1-xNbxO3

Autor: Toulouse, J., Iolin, E., Hennion, B., Petitgrand, D., Erwin, R.

Publikováno v: Phys. Rev. B 94, 214116 (2016)

The damping ($\Gamma_a$) of the transverse acoustic (TA) phonon in single crystals of the relaxor $KTa_{1-x}Nb_xO_3$ with x=0.15-0.17 was studied by means of high resolution inelastic cold neutron scattering near the (200) B.Z. point where diffuse sc

Externí odkaz: http://arxiv.org/abs/1608.01591

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Neutron scattering by ultrasound in mosaic single crystals

Autor: Iolin, E., Farago, B., Mezei, F., Rusevich, L., Pieper, J., Buchsteiner, A., Ehlers, G., Haussler, W.

The Time-of-Flight and Neutron-Spin-Echo techniques have been applied for the research of ultrasonic effect at the cold neutron diffraction in mosaic single crystals (KBr and mica). It was found that h.f. ultrasound intensifies quasi-elastic neutron

Externí odkaz: http://arxiv.org/abs/1201.2480

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Theoretical Study of the Soft Optic Mode Dynamics in a Relaxor Ferroelectric. The Effect of Polar Nanoregions

Autor: Iolin, E., Toulouse, J.

We propose a simple and solvable mean-field model of the scattering of transverse optic modes by Polarized Nano Regions (PNR) in the paraelectric phase of relaxor ferroelectrics. The PNR is assumed to be a ferroelectric sphere embedded in the host is

Externí odkaz: http://arxiv.org/abs/1007.3537

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A new scattering mechanism of acoustic phonons in relaxor ferroelectrics: the case of KTa_{1-x}Nb_xO_3

Autor: Toulouse, J., Iolin, E., Hennion, B., Petitgrand, D., Yong, G., Erwin, R.

The complex interaction between transverse acoustic (TA) phonon, transverse optic (TO) phonon and polar nano-domains (PND) in the relaxor ferroelectric KTa1-xNbxO3 (KTN) is studied by means of high resolution diffuse and inelastic neutron scattering.

Externí odkaz: http://arxiv.org/abs/1001.4096

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