Multiferroic bismuth ferrite: Perturbed angular correlation studies on its ferroic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:mi>β</mml:mi></mml:math> phase transition
Physical review. B./Physical review. B