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Coupled short-range ferroelectric and magnetic order in PbFe_{1/2}Nb_{1/2}O_{3} (2013)

C. Stock, S. R. Dunsiger, R. A. Mole, X. Li, and H. Luo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-14

Description: Author(s): C. Stock, S. R. Dunsiger, R. A. Mole, X. Li, and H. Luo A neutron scattering investigation of the magnetoelectric coupling in PbFe 1/2 Nb 1/2 O 3 has been undertaken. Ferroelectric order occurs below 400 K, as evidenced by the softening with temperature and subsequent recovery of the zone center transverse optic phonon mode energy ( ℏ Ω 0 ). Over the same tempera... [Phys. Rev. B 88, 094105] Published Fri Sep 13, 2013

Keywords: Structure, structural phase transitions, mechanical properties, defects

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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Freezing of the local dynamics in the relaxor ferroelectric [Pb(Zn_{1/3}Nb_{2/3})O_{3}]_{0.955}[PbTiO_{3}]_{0.045} (2012)

Zhijun Xu, Jinsheng Wen, E. Mamontov, C. Stock, P. M. Gehring, and Guangyong Xu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): Zhijun Xu, Jinsheng Wen, E. Mamontov, C. Stock, P. M. Gehring, and Guangyong Xu We report measurements of the neutron diffuse scattering in a single crystal of the relaxor ferroelectric material 95.5%Pb(Zn 1/3 Nb 2/3 )O 3 -4.5%PbTiO 3 (PZN-4.5%PT). We show that the diffuse scattering at high temperatures has a quasielastic component with energy width ≳0.1 meV. On cooling the total dif... [Phys. Rev. B 86, 144106] Published Fri Oct 05, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Charge-doping-induced phase transitions in hydrogenated and fluorinated graphene (2014)

Tim O. Wehling, Bernhard Grundkötter-Stock, Bálint Aradi, Thomas Frauenheim, and Thomas Niehaus

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-08-21

Description: Author(s): Tim O. Wehling, Bernhard Grundkötter-Stock, Bálint Aradi, Thomas Frauenheim, and Thomas Niehaus We show that charge doping can induce transitions between three distinct adsorbate phases in hydrogenated and fluorinated graphene. By combining ab initio, approximate density functional theory and tight-binding calculations we identify a transition from islands of C8H2 and C8F2 to random adsorbate ... [Phys. Rev. B 90, 085422] Published Wed Aug 20, 2014

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Evidence for anisotropic polar nanoregions in relaxor Pb(Mg_{1/3}Nb_{2/3})O_{3}: A neutron study of the elastic constants and anomalous TA phonon damping in PMN (2012)

C. Stock, P. M. Gehring, H. Hiraka, I. Swainson, Guangyong Xu, Z.-G. Ye, H. Luo, J.-F. Li, and D. Viehland

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-19

Description: Author(s): C. Stock, P. M. Gehring, H. Hiraka, I. Swainson, Guangyong Xu, Z.-G. Ye, H. Luo, J.-F. Li, and D. Viehland We use neutron inelastic scattering to characterize the acoustic phonons in the relaxor Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) and demonstrate the presence of a highly anisotropic damping mechanism that is directly related to short-range polar correlations. For a large range of temperatures above T c ∼210 K, where d... [Phys. Rev. B 86, 104108] Published Tue Sep 18, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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