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16 papers
Crystal Structure and Phonon Density of States of FeSi up to 120 GPa
Ravhi S Kumar, Han Liu, Quan Li +9
The strongly correlated material FeSi exhibits several unusual thermal, magnetic, and structural properties under varying pressure-temperature (P-T) conditions. It is a potential t…
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…
Nonlinearity of the post-spinel transition and its expression in slabs and plumes worldwide
Junjie Dong, Rebecca A. Fischer, Lars Stixrude +6
At the interface of Earth's upper and lower mantle, the post-spinel transition boundary controls the dynamics and morphologies of downwelling slabs and upwelling plumes, and its Cl…
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…
Ultra-high pressure disordered eight-coordinated phase of MgGeO: Analogue for super-Earth mantles
Rajkrishna Dutta, Sally J. Tracy, Ronald E. Cohen +9
Mg2GeO4 is an analogue for the ultra-high pressure behavior of Mg2SiO4, so we have investigated magnesium germanate to 275 GPa and over 2000 K using a laser-heated diamond anvil ce…
Pressure induced collapse of magnetic order in jarosite
Ryan A. Klein, James P. S. Walsh, Samantha M. Clarke +12
We report a pressure-induced phase transition in the frustrated kagomé material jarosite at ~45 GPa, which leads to the disappearance of magnetic order. Using a suite of experiment…