Transverse acoustic phonon anomalies at intermediate wave vectors in MgV2O4
نویسندگان
چکیده
T. Weber,1,2,* B. Roessli,3 C. Stock,4 T. Keller,5,2 K. Schmalzl,6 F. Bourdarot,7 R. Georgii,2 R. A. Ewings,8 R. S. Perry,8,9 and P. Böni1 1Physik-Department E21, Technische Universität München (TUM), James-Franck-Strasse 1, 85748 Garching, Germany 2Heinz-Maier-Leibnitz-Zentrum (MLZ), Technische Universität München (TUM), Lichtenbergstrasse 1, 85747 Garching, Germany 3Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland 4School of Physics and Astronomy and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom 5Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany 6Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, Outstation at Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble Cedex 9, France 7Département de Recherche Fondamentale sur la Matière Condensée, SPSMS/MDN, CEA Grenoble, 38054 Grenoble, France 8ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory (RAL), Harwell Campus, Didcot, Oxon, OX11 0QX, United Kingdom 9London Centre for Nanotechnology and UCL Centre for Materials Discovery, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom (Received 10 June 2017; revised manuscript received 15 October 2017; published 7 November 2017)
منابع مشابه
Singularities in the Polarizability of Superconductors at Nesting Vectors
We calculate the electronic polarizability in the superconducting state at nesting vectors of the Fermi surface. A pole appears in the polarizability at frequencies ω near the superconducting gap 2∆ for arbitrary small couplings in two dimensions. This leads to the appearance of a sharp peak at ω just below 2∆ in the lattice vibrations at the nesting vectors. The results are compared with the r...
متن کاملDissipative Interaction and Anomalous Surface Absorption of Bulk Phonons at a Two-Dimensional Defect in a Solid
We predict an extreme sensitivity to the dissipative losses of the resonant interaction of bulk phonons with a 2D defect in a solid. We show that the total resonant reflection of the transverse phonon at the 2D defect, described earlier without an account for dissipation, occurs only in the limit of extremely weak dissipation and is changed into almost total transmission by relatively weak bulk...
متن کاملبررسی کوپلینگ پیزوالکتریکی و آنیزتروپی بر انتشار امواج صوتی در بلوره صوتی لیتیوم نیوباته
The acoustic wave velocity depends on elasticity and density at most materials, but because of anisotropy and especially piezoelectric coupling effect, the acoustic wave propagation at piezoelectric based crystalloacoustic materials, is an applied and challenging problem. In this paper, using modified Christoffel's equation based on group velocity concept, the effect of anisotropy and piezoelec...
متن کاملPhonon scattering at SWCNT–SWCNT junctions in branched carbon nanotube networks
In this research article, we analyze phonon scattering in branched single-walled carbon nanotube (SWCNT) networks with SWCNT–SWCNT Tand Xjunctions using the wave packet method. Five phonon branches including the longitudinal acoustic, twisting, transverse acoustic, radial breathing, and flexural optical modes are selected to study energy reflection, ramification, and transmission through Tand X...
متن کاملMonte Carlo Modeling of Heat Generation in Electronic Nanostructures
This work develops a Monte Carlo (MC) simulation method for calculating the heat generation rate in electronic nanostructures. Electrons accelerated by the electric field scatter strongly with optical phonons, yet heat transport in silicon occurs via the faster acoustic modes. The MC method incorporates the appropriate energy transfer rates from electrons to each phonon branch. This accounts fo...
متن کامل