389 citations
- Geophysical LaboratoryUS7 papers
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- Bhabha Atomic Research CentreIN2 papers
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4 papers · 1 filter
First principles studies of the Born effective charges and electronic dielectric tensors for the relaxor PMN (PbMg1/3Nb2/3O3)
Narayani Choudhury, R. E. Cohen, Eric J. Walter
We report first principles density functional calculations of the Born effective charges and electronic dielectric tensors for the relaxor PMN (PbMg1/3Nb2/3O3). Visualization of th…
Pressure-Induced Anomalous Phase Transitions and Colossal Enhancement of Piezoelectricity in PbTiO
Zhigang Wu, Ronald E. Cohen
We find an unexpected tetragonal-to-monoclinic-to-rhombohedral-to-cubic phase transition sequence induced by pressure, and a morphotropic phase boundary in a pure compound using fi…
Extrasolar Carbon Planets
Marc J. Kuchner, S. Seager
We suggest that some extrasolar planets <~ 60 Earth masses will form substantially from silicon carbide and other carbon compounds. Pulsar planets and low-mass white dwarf planets…
Vegetation's Red Edge: A Possible Spectroscopic Biosignature of Extraterrestrial Plants
Sara Seager, Edwin L. Turner, Justin Schafer +1
Earth's deciduous plants have a sharp order-of-magnitude increase in leaf reflectance between approximately 700 and 750 nm wavelength. This strong reflectance of Earth's vegetation…