M
Muhtar Ahart
Researcher at Carnegie Institution for Science
Publications - 79
Citations - 2993
Muhtar Ahart is an academic researcher from Carnegie Institution for Science. The author has contributed to research in topics: Brillouin scattering & Brillouin zone. The author has an hindex of 20, co-authored 74 publications receiving 2365 citations. Previous affiliations of Muhtar Ahart include University of Electro-Communications & George Washington University.
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Journal ArticleDOI
Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures
Maddury Somayazulu,Muhtar Ahart,Ajay Kumar Mishra,Zachary M. Geballe,Maria Baldini,Yue Meng,Viktor V. Struzhkin,Russell J. Hemley +7 more
TL;DR: It is suggested that the transitions represent signatures of superconductivity to near room temperature in phases of lanthanum superhydride, in good agreement with density functional structure search and BCS theory calculations.
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Origin of morphotropic phase boundaries in ferroelectrics
Muhtar Ahart,Maddury Somayazulu,Ronald E. Cohen,Panchapakesan Ganesh,Przemyslaw Dera,Ho-kwang Mao,Russell J. Hemley,Yang Ren,Peter Liermann,Zhigang Wu +9 more
TL;DR: This work shows that even a pure compound, in this case lead titanate, can display a morphotropic phase boundary under pressure, and finds that complex microstructures or compositions are not necessary to obtain strong piezoelectricity.
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Synthesis and Stability of Lanthanum Superhydrides.
Zachary M. Geballe,Hanyu Liu,Ajay Kumar Mishra,Muhtar Ahart,Maddury Somayazulu,Yue Meng,Maria Baldini,Russell J. Hemley +7 more
TL;DR: X-ray diffraction and optical studies demonstrate that superhydrides of lanthanum can be synthesized with La atoms in an fcc lattice at 170 GPa upon heating to about 1000 K, and the results match the predicted cubic metallic phase of LaH10 having cages of thirty-two hydrogen atoms surrounding each La atom.
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Pressure-induced metallization of silane
Xiao-Jia Chen,Viktor V. Struzhkin,Yang Song,Alexander F. Goncharov,Muhtar Ahart,Zhenxian Liu,Ho-kwang Mao,Russell J. Hemley +7 more
TL;DR: Measurements of Raman and infrared spectra of silane under pressure find that SiH4 undergoes three phase transitions before becoming opaque at 27–30 GPa, indicating the onset of pressure-induced metallization.
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High-Pressure Measurements of Hydrogen Phase IV Using Synchrotron Infrared Spectroscopy
TL;DR: Phase IV of dense solid hydrogen has been identified by its infrared spectrum using high-pressure synchrotron radiation techniques, indicating the stability of molecular H(2) with decreased intermolecular interactions and charge transfer between molecules.