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Search Publications by: Peter M. Gehring (Fed)

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Displaying 1 - 25 of 67

Magnetic skin effect in Pb(Fe1/2Nb1/2)O3

July 29, 2024
Author(s)
Guangyong Xu, Peter M. Gehring
Relaxor-ferroelectrics display exceptional dielectric properties resulting from the underlying random dipolar fields induced by strong chemical inhomogeneity. An unusual structural aspect of relaxors is a skin-effect where the near-surface region in single

Magnetic Skin Effect in Pb(Fe1/2Nb1/2)O3

July 29, 2024
Author(s)
Nathan Giles-Donovan, A. D. Hillier, K Ishida, B.V. Hampshire, S. Giblin, B. Roessli, Peter M. Gehring, Guangyong Xu, Xiaobing Li, Haosu Luo, Sandy Cochran, C. Stock
Relaxor-ferroelectrics display exceptional dielectric properties resulting from the underlying random dipolar fields induced by strong chemical inhomogeneity. An unusual structural aspect of relaxors is a skin-effect where the near-surface region in single

The Nature of Dynamic Local Order in CH 3 NH 3 Pbl 3 and CH 3 NH 3 PbBr 3

May 17, 2023
Author(s)
Nicholas Weadock, Tyler C. Sterling, Julian A. Vigil, Aryeh Gold-Parker, Ian C. Smith, Ballal Ahammed, Matthew Krogstad, Feng Ye, David Voneshen, Peter M. Gehring, Andrew M. Rappe, Hans-Georg Steinruck, Elif Ertekin, Hemamala I. Karunadasa, Dmitry Reznik, Michael F. Toney
Hybrid lead halide perovskites (LHPs) are a class of semiconductor with novel physical properties and impressive optoelectronic performance that are distinctively governed by structural fluctuations. [1, 2] Diffraction experiments sensitive to average

Unravelled and Glassy Magnetism in PbFe 1/2 Nb 1/2 O 3 - (2) Neutron Scattering

October 11, 2022
Author(s)
C. Stock, B. Roessli, Peter M. Gehring, Jose Rodriguez Rivera, N. Giles-Donovan, S. Cochran, Guangyong Xu, P. Manuel, M. J. Gutmann, William D. Ratcliff, T. Fennell, Y. Su, X. Li, H. Luo
We apply neutron scattering to investigate the magnetism in the relaxor ferroelectric PbFe 1/2Nb 1/2O 3 (PFN). Similar to the lack of spatially long-range ferroelectric order in prototypical relaxors like Pb(Mg,Zn) 1/3Nb 2/3O 3 (PMN and PZN), spatially

Growth and Characterization of Large (Y,La)TiO 3 and (Y,Ca)TiO 3 Single Crystals

December 29, 2021
Author(s)
Sajna Hameed, Joseph Joe, Laxman Thoutam, Javier Garcia Barriocanal, Biqiong Yu, Guichuan Yu, S. Chi, Tao Hong, Travis Williams, John W. Freeland, Peter M. Gehring, Zhijun Xu, Masaaki Matsuda, Bharat Jalan, Martin Greven
The Mott-insulating rare-earth titanates (RTiO 3, R being a rare-earth ion) are an important class of materials that encompasses interesting spin-orbital phases, ferromagnet-antiferromagnet and insulator-metal transitions. The growth of these materials has

Decoupled Molecular and Inorganic Framework Dynamics in CH 3 NH 3 PbCl 3

December 30, 2019
Author(s)
M. Songvilay, Zitian Wang, Victoria Garcia Sakai, T. Guidi, M. Bari, Zuo-Guang Ye, Guangyong Xu, K. L. Brown, Peter M. Gehring, Christopher Stock
The organic-inorganic lead halide perovskites are composed of organic molecules embedded in an inorganic framework. The compounds with general formula CH 3NH 3PbX 3 (MAPbX 2) display large photovoltaic efficiencies for halogens X=Cl, Br, and I in a wide

Anharmonic Acoustic Phonons and A-site Critical Fluctuations in the Lead Halide Perovskite CsPbBr 3

September 17, 2019
Author(s)
M. Songvilay, Nathan Giles-Donovan, M. Bari, Z.-G. Ye, J. L. Minns, M. A. Green, Guangyong Xu, Peter M. Gehring, K. Schmalzl, William D. Ratcliff, Craig Brown, D. Chernyshov, W. van Beek, Sandy Cochran, Christopher Stock
We apply neutron spectroscopy to investigate the transverse acoustic phonons in the lead halide CsPbBr 3 near the three zone boundaries of the cubic Pm3m Brillouin zone at QX = (2,1/2,0), Q M = (3/2,1/2,0), and Q R = (1/2,1/2,3/2). CsPbB r3 undergoes two

Electric Field Effect on Short-Range Polar Order in a Relaxor Ferroelectric System

July 30, 2019
Author(s)
Zhijun Xu, Fei Li, Shujun Zhang, Christopher Stock, Jun Luo, Peter M. Gehring, Guangyong Xu
Short-range polar orders in the relaxor ferroelectric material PbMg 1/2Nb 2/3O 3-28%PbTiO 3 (PMN-28PT) have been studied using neutron diffuse scattering. An external electric field along [110] direction can affect the diffuse scattering in the low

Comment on "Giant Electromechanical Coupling of Relaxor Ferroelectrics Controlled by Polar Nanoregion Vibrations"

March 22, 2019
Author(s)
Peter M. Gehring, Zhijun NMN Xu, C. Stock, Guangyong NMN Xu, Daniel E Parshall, Leland Weldon Harriger, C. A. Gehring, Xiaobing Li, Haosu Luo
Manley et al. (Science Advances, 16 September 2016, p.e1501814) report a splitting of a transverse acoustic phonon branch below T c in the relaxor ferroelectric Pb[(Mg 1/3Nb 2/3) 1-xTi x]O 3 with x=0.30 using neutron scattering methods. They argue that