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Search Publications by: Peter M. Gehring (Fed)

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Displaying 26 - 50 of 67

The Relation of Local Order to Material Properties in Relaxor Ferroelectrics

June 25, 2018
Author(s)
Matthew Krogstad, Peter M. Gehring, Stephan Rosenkranz, Raymond Osborn, Feng Ye, Yaohua Liu, Jacob P. C. Ruff, Wenzhi Chen, Justin M. Wozniak, Haosu Luo, O. Chmaissem, Zuo-Guang Ye, Daniel Phelan
Four different forms of local order that give rise to diffuse neutron and x-ray scattering in the relaxor ferroelectric series PMN-xPT are identified via broad, three-dimensional surveys of reciprocal space. Composition and temperature-dependent

Depth Dependant Element Analysis of PbMg 1/3 Nb 2/3 O 3 using Muonic X-rays

February 28, 2018
Author(s)
Katherine L Brown, Chris PJ Stockdale, Haosu Luo, X Zhao, Jiefang Li, Dwight Viehland, Guangyong Xu, Peter M. Gehring, K Ishida, A. D. Hillier, C. Stock
The relaxor PbMg 1.3Nb 2/3O 3 (PMN) has received attention due to its potential applications as a piezoelectric when doped with PbTiO3 (PT). Previous results have found that there are two phases existing in the system, one linked to the near-surface

Spontaneous Decay of a Soft Optical Phonon in the Relaxor Ferroelectric PbMg 1/3 Nb 2/3 O 3

February 13, 2018
Author(s)
C. Stock, Peter M. Gehring, R. A. Ewings, Guangyong Xu, Jiefang Li, Dwight Viehland, Haosu Luo
We report the spontaneous decay of a soft, optical phonon in a solid. Using neutron spectroscopy, we find that specific phonon lifetimes in the relaxor PbMg 1/3Nb 2/3O 3 are anomalously short within well-defined ranges of energy and momentum. This behavior

Correspondence: Phantom Phonon Localization in Relaxors

December 5, 2017
Author(s)
Peter M. Gehring, Daniel E Parshall, Leland Weldon Harriger, Christopher Stock, Guangyong Xu, Xiaobing Li, Haosu Luo
Manley et al. (Ref. [1]) report the observation of an unexpected, weak, phonon mode located in energy between that of the transverse acoustic (TA) and soft transverse optic (TO) modes in the relaxor ferroelectric Pb[(Mg0.33Nb0.67)1-xTix]O3 (PMN-xPT) with

Fragile Morphotropic Phase Boundary and Phase Stability in the Near-Surface Region of Relaxor Ferroelectric (1-x)Pb(Zn 1/3 Nb 2/3 )O 3-x PbTiO 3 : [001] Field-Cooled Phase Diagrams

November 10, 2016
Author(s)
Yaojin Wang, Ding Wang, Guoliang Yuan, He Ma, Feng Xu, Jiefang Li, D. Viehland, Peter M. Gehring
We have examined the effects of field cooling on the phase diagram of the relaxor system (1-X)Pb(Zn 1/3Nb 2/3)O6d3-x^PbTiO 3 (PZN-xPT) for compositions near the morphotropic phase boundary (MPB). High-resolution diffraction measurements using CuK αx-rays

Neutron Scattering Study of Spin Ordering and Stripe Pinning in Superconducting La 1.93Sr d0.07^CuO 4

November 20, 2015
Author(s)
H. Jacobsen, I. A. Zaliznyak, A. T. Savici, B. L. Winn, S. Chang, M. Hucker, G. D. Gu, J. M. Tranquada, Peter M. Gehring
The relationships among charge order, spin fluctuations, and superconductivity in underdoped cuprates remain controversial. We use neutron scattering techniques to study these phenomena in La 1.93Sr 0.07CuO 4, a superconductor with a transition temperature

Separation of Magnetic and Superconducting Behaviour in YBa 2 Cu 3 O 6.33 (T c =8.4 K)

April 29, 2015
Author(s)
Zahra Yamani, W.J. L. Buyers, F Wang, Young-June Kim, Jae-Ho Chung, Sung Chang, Peter M. Gehring, Goran Gasparovic, Christopher Stock, C. L. Broholm, J.C. Baglo, Ruixing Liang, D. A. Bonn, W. N. Hardy
Neutron scattering from high-quality YBa2Cu3O6.33 (YBCO6.33) single crystals with a Tc of 8.4 K shows no evidence of a coexistence of superconductivity with long-range antiferromagnetic order at this very low, near-critical doping of p0.055. However, we

Neutron Inelastic Scattering Measurements of Low-Energy Phonons in the Multiferroic BiFeO 3

February 10, 2015
Author(s)
John A. Schneeloch, Zhijun Xu, Jinsheng Wen, Peter M. Gehring, Christopher Stock, M. Matsuda, B. Winn, Genda Gu, S. M. Shapiro, R. J. Birgeneau, T. Ushiyama, Y. Yanagisawa, Y. Tomioka, T. Ito, Guangyong Xu
We present neutron inelastic scattering measurements of the low-energy phonons in single crystal BiFeO3. The dispersions of the three acoustic phonon modes (LA along [100], TA1 along [010] and TA2 along [1¯10]) and two low energy optic phonon modes (LO and

Phase Diagram of the Relaxor Ferroelectric (1-x)Pb(Mg 1/3 Nb 2/3 )O 3-x PbTiO 3 Revisted: A neutron Powder Diffraction Study of the Relaxor Skin Effect

January 19, 2015
Author(s)
Daniel Phelan, Efrain E. Rodriguez, J Gao, Y Bing, Z.-G. Ye, Qingzhen Huang, Jinsheng Wen, Guangyong Xu, C. Stock, M Matsuura, Peter M. Gehring
We revisit the phase diagram of the relaxor ferroelectric PMN-xPT using neutron powder diffraction to test suggestions that residual oxygen vacancies and/or strain affect the ground state crystal structure. Powdered samples of PMN-xPT were prepared with

Fluctuating Defects in the Incipient Relaxor K 1-x Li x TaO 3 (x=0.02)

December 24, 2014
Author(s)
C. Stock, Peter M. Gehring, G. Xu, Daniel Lamago, Dmitry Reznik, M. Russina, Jinsheng Wen, Lynn A. Boatner
We report neutron scattering measurements of the structural correlations associated with the apparent relaxor transition in K 1-xLi xTaO 2 for x=0.02 (KLT(0.02)). This compound displays a broad and frequency-dependent peak in the dielectric permittivity

Role of Random Electric Fields in Relaxors

February 14, 2014
Author(s)
Daniel P. Phelan, Christopher Stock, Jose Rodriguez Rivera, Songxue Chi, Juscelino Leao, Xifa Long, Yujuan Xie, Alexei A. Bokov, Zuo-Guang Ye, Panchapakesan Ganesh, Peter M. Gehring
Pb(Zr 1¿xTi x)O 3 (PZT) and Pb[(Mg 1/3Nb 2/3) 1¿xTi x]O 3 (PMN-xPT) are complex lead-oxide perovskites that display exceptional piezoelectric properties for pseudo-rhombohedral compositions near a tetragonal phase boundary. In PZT these compositions are

Constraints on the Possible Long-Range Orbital Ordering in LaCoO 3

January 1, 2014
Author(s)
Daniel P. Phelan, Peter M. Gehring
A neutron powder diffraction measurement was performed to distinguish between the proposed monoclinic (I2/a) structure of LaCoO 3, which is consistent with orbital ordering, and the rhombohedral (R3c) structure, which is inconsistent with orbital ordering

Lead-free and Lead-Based ABO 3 Perovskite Relaxors with Mixed-Valence A-Site and B-Site Disorder: A Comparative Neutron Scattering Structural Study of (NaYd1/2^Bi 1/2)TiO d3^ and Pb(MgYd1/3^Nb 2/3 )O 3

November 27, 2013
Author(s)
Wenwei Ge, Christopher P. Devreugd, Daniel Phelan, Qinhui Zhang, Muhtar Ahart, Jiefang Li, Haosu Luo, Lynn A. Boatner, Dwight Viehland, Peter M. Gehring
We report the results of neutron elastic scattering measurements between -250°C and 620°C on the lead-free relaxor Na 1/2Bi 1/2TiO 3 (NBT). Strong, anisotropic, elastic diffuse scattering intensity decorates the (100), (110), (111), (200), (220), and (210)