Physics – Condensed Matter – Materials Science
Scientific paper
2011-12-22
Physics
Condensed Matter
Materials Science
Scientific paper
To investigate the pressure-induced structural transitions of chromium dioxide (CrO$_{2}$), phonon dispersions and total energy band structures are calculated as a function of pressure. The first structural transition has been confirmed at P$\approx$ 10 GPa from the ground state tetragonal CrO$_{2}$ (t-CrO$_{2}$) of rutile type to orthorhombic CrO$_{2}$ (o-CrO$_{2}$) of CaCl$_{2}$ type. The half-metallic property is found to be preserved in o-CrO$_{2}$. The softening of Raman-active B$_{1g}$ phonon mode, which is responsible for this structural transition, is demonstrated. The second structural transition is found to occur for P$\geq$ 61.1 GPa from ferromagnetic (FM) o-CrO$_{2}$ to nonmagnetic (NM) monoclinic CrO$_{2}$ (m-CrO$_{2}$) of MoO$_{2}$ type, which is related to the softening mode at {\bf q} = R(1/2,0,1/2). The third structural transition has been newly identified at P= 88.8 GPa from m-CrO$_{2}$ to cubic CrO$_{2}$ of CaF$_{2}$ type that is a FM insulator.
Kang Chang-Jong
Kim Kyoo
Kim Sooran
Min B. I.
No associations
LandOfFree
Pressure-induced Phonon Softenings and the Structural and Magnetic Transitions in CrO$_{2}$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pressure-induced Phonon Softenings and the Structural and Magnetic Transitions in CrO$_{2}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-induced Phonon Softenings and the Structural and Magnetic Transitions in CrO$_{2}$ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-306007