Transition pressures and enthalpy barriers for the cubic diamond<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>→</mml:mo><mml:mi>β</mml:mi></mml:mrow></mml:math>-tin transition in Si and Ge under nonhydrostatic conditions

We present an ab initio study of the phase transition cubic diamond$\ensuremath{\rightarrow}\ensuremath{\beta}$-tin in Si and Ge under hydrostatic and nonhyd...