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15 papers
Novel Transformations of PbTiO3 with Pressure and Temperature
Husam Farraj, Stefano Racioppi, Gaston Garbarino +8
We investigated the behavior of lead titanate (PbTiO3) up to 100 GPa, both at room temperature and upon laser heating, using synchrotron X ray diffraction combined with density fun…
X-ray Diffraction and Electrical Transport Imaging of Superconducting Superhydride (La,Y)H10
Abdul Haseeb Manayil Marathamkottil, Kui Wang, Nilesh P. Salke +9
We report the synthesis and characterization of (La0.9Y0.1)H10 superhydrides exhibiting coexisting cubic Fm-3m and hexagonal P63/mmc clathrate phases observed over the pressure ran…
Absence of high pressure ground state re-entrant ferroelectricity in PbTiO
R. E. Cohen, Yangzheng Lin, Muhtar Ahart +1
We study ferroelectricity in the classic perovskite ferroelectric PbTiO to high pressures with density functional theory (DFT) and experimental diamond-anvil techniques. We use…
Evidence for Near Ambient Superconductivity in the Lu-N-H System
Nilesh P. Salke, Alexander C. Mark, Muhtar Ahart +1
The recent report of superconductivity in nitrogen-doped lutetium hydride at near-ambient pressures and temperatures has attracted great attention but also continuing controversy.…
Observation of Conventional Near Room Temperature Superconductivity in Carbonaceous Sulfur Hydride
Hiranya Pasan, Elliot Snider, Sasanka Munasinghe +21
The phenomenon of high temperature superconductivity, approaching room temperature, has been realized in a number of hydrogen-dominant alloy systems under high pressure conditions1…
Structure and equation of state of from x-ray diffraction to megabar pressures
Alexander C. Mark, Muhtar Ahart, Ravhi Kumar +7
Pressure is a unique tuning parameter for probing the properties of materials and has been particularly useful for studies of electronic materials such as high-temperature cuprate…
X-ray Diffraction and Equation of State of the C-S-H Room-Temperature Superconductor
Anmol Lamichhane, Ravhi Kumar, Muhtar Ahart +10
X-ray diffraction indicates that the structure of the recently discovered room temperature carbonaceous sulfur hydride (C-S-H) superconductor is derived from previously established…
Hot Hydride Superconductivity above 550 K
A. D. Grockowiak, M. Ahart, T. Helm +9
The search for room temperature superconductivity has accelerated dramatically in the last few years driven largely by theoretical predictions that first indicated alloying dense h…
Road to Room-Temperature Superconductivity: Tc above 260 K in Lanthanum Superhydride under Pressure
Russell J. Hemley, Muhtar Ahart, Hanyu Liu +1
The use of high pressure to realize superconductivity in the vicinity of room temperature has a long history, much of it focused on achieving this in hydrogen rich materials. This…
Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
Maddury Somayazulu, Muhtar Ahart, Ajay K Mishra +5
Recent predictions and experimental observations of high Tc superconductivity in hydrogen-rich materials at very high pressures are driving the search for superconductivity in the…
Effect of aging and Mn substitution on anisotropy of third generation piezoelectrics
Rajasekarakumar Vadapoo, Muhtar Ahart, Margo Staruch +4
We predict a new candidate high-temperature high-pressure structure of FeSiO with space-group symmetry Cmmm by applying an evolutionary algorithm within DFT+U that we call post…
Synthesis of Polar Ordered Oxynitride Perovskite
Muhtar Ahart, Maddury Somayazulu, Rajasekarakumar Vadapoo +5
For decades, numerous attempts have been made to produce polar oxynitride perovskites, where some of the oxygen are replaced by nitrogen, but a polar ordered oxynitride has never b…
Pressure dependence of the monoclinic phase in (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 solid solutions
Muhtar Ahart, Stanislav Sinogeikin, Olga Shebanova +5
We combine high-pressure x-ray diffraction, high-pressure Raman scattering, and optical microscope to investigate a series of PMN-xPT solid solutions (x=0.2, 0.3, 0.33, 0.35, 0.37,…
Origin of Diffuse Scattering in Relaxor Ferroelectrics
P. Ganesh, E. Cockayne, M. Ahart +6
High-pressure and variable temperature single crystal synchrotron X-ray measurements combined with first-principles based molecular dynamics simulations study diffuse scattering in…
Brillouin scattering and molecular dynamics study of the elastic properties of Pb(Mg1/3Nb2/3)O3
Muhtar Ahart, Aravind Asthagiri, Zuo-Guang Ye +4
We report the complete set of elastic constants and the bulk modulus for single crystal Pb(Mg1/3Nb2/3)O3 (PMN) at room temperature obtained from Brillouin spectroscopy and molecula…