Correspondence: Phantom phonon localization in relaxors

Autor: Peter M. Gehring, Dan Parshall, Leland Harriger, Chris Stock, Guangyong Xu, Xiaobing Li, Haosu Luo

Publikováno v: Nature Communications, Vol 8, Iss 1, Pp 1-2 (2017)

Externí odkaz: https://doaj.org/article/ce130518ab35418badf1438a381ec1f7

Two-dimensional ferromagnetic spin-orbital excitations in the honeycomb VI$_{3}$

Autor: Russell A. Ewings, H. Lane, M. Songvilay, Jose A. Rodriguez-Rivera, Elise Pachoud, Chris Stock, Guangyong Nmn Xu, Peter M. Gehring, J. P. Attfield

Publikováno v: Lane, H, Pachoud, E, Rodriguez-Rivera, J A, Songvilay, M, Xu, G, Gehring, P M, Attfield, J P, Ewings, R A & Stock, C 2021, ' Two-dimensional ferromagnetic spin-orbital excitations in honeycomb VI3 ', Physical Review B, vol. 104, no. 2, L020411, pp. 1-7 . https://doi.org/10.1103/PhysRevB.104.L020411

VI$_{3}$ is a ferromagnet with planar honeycomb sheets of bonded V$^{3+}$ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two dimensional ($J/J_{c} \approx 17$) magnetic excitations in the ferromagnetic phase,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6c65aeda3906c37cc8acb7da88072d8

Test of the Dynamic-Domain and Critical Scattering Hypotheses in Cubic Methylammonium Lead Triiodide

Autor: Nicholas J. Weadock, Ian C. P. Smith, Peter M. Gehring, Aryeh Gold-Parker, Hemamala I. Karunadasa, Michael F. Toney

Publikováno v: Physical Review Letters. 125

We investigate the hypothesis of dynamic tetragonal domains occurring in cubic ${\mathrm{CH}}_{3}{\mathrm{NH}}_{3}{\mathrm{PbI}}_{3}$ using high-resolution neutron spectroscopy to study a fully deuterated single crystal. The $R$-point scattering abov

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::57b2ebad48b4634ff5983bc69c3e65e4
https://doi.org/10.1103/physrevlett.125.075701

Common acoustic phonon lifetimes in inorganic and hybrid lead halide perovskites

Autor: Guangyong Xu, N. Giles-Donovan, William Ratcliff, Mark Green, Peter M. Gehring, Sandy Cochran, J. L. Minns, Zuo-Guang Ye, W. van Beek, M. Songvilay, Maryam Bari, Chris Stock, Karin Schmalzl, Dmitry Chernyshov, Craig M. Brown

Publikováno v: Songvilay, M, Giles-Donovan, N, Bari, M, Ye, Z-G, Minns, J L, Green, M A, Xu, G, Gehring, P M, Schmalzl, K, Ratcliff, W D, Brown, C M, Chernyshov, D, Beek, W V, Cochran, S & Stock, C 2019, ' Common acoustic phonon lifetimes in inorganic and hybrid lead halide perovskites ', Physical Review Materials, vol. 3, no. 9, 093602 . https://doi.org/10.1103/PhysRevMaterials.3.093602
Phys Rev Mater
Physical review materials 3, 093602 (2019). doi:10.1103/PhysRevMaterials.3.093602

The acoustic phonons in the organic-inorganic lead halide perovskites have been reported to have anomalously short lifetimes over a large part of the Brillouin zone. The resulting shortened mean free paths of the phonons have been implicated as the o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7da1b6e3e4eb12e209eccb26e8568a46
https://hdl.handle.net/20.500.11820/d78d77ad-6f4f-48ca-a622-7de682977c0e

Comment on 'Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations'

Autor: Chris Stock, Guangyong Xu, Dan Parshall, Zhijun Xu, Peter M. Gehring, Leland Weldon Harriger, Xiaobing Li, Haosu Luo, Clement Gehring

Publikováno v: Science Advances
Gehring, P M, Xu, Z, Stock, C, Xu, G, Parshall, D, Harriger, L, Gehring, C A, Li, X & Luo, H 2019, ' Comment on“Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations" ', Science Advances . https://doi.org/10.1126/sciadv.aar5066

Phantom indications of phonon anticrossing in relaxor ferroelectrics can arise via an inelastic double-scattering process.
Manley et al. (Science Advances, 16 September 2016, p. e1501814) report the splitting of a transverse acoustic phonon bran

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2749c21027590441832ab52b19c742bf
https://doi.org/10.1126/sciadv.aar5066