High-pressure structure of half-metallic CrO{sub 2}

Journal Article · Sat Apr 01 04:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788052

Maddox, B R; Yoo, C S; Kasinathan, Deepa; Pickett, W E; Scalettar, R T ^[1]

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1. University of California, Davis, California 95616, USA and Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

Evidence for a structural phase transition from rutile {alpha}-CrO{sub 2} phase I (P4{sub 2}/mnm) to orthorhombic {beta}-CrO{sub 2} phase II (CaCl{sub 2}-like, Pnnm) is presented using angle-resolved synchrotron x-ray diffraction and high-sensitivity confocal Raman spectroscopy. The transition to the CaCl{sub 2} structure, which appears to be second order, occurs at 12{+-}3 GPa without any measurable discontinuity in volume, but is accompanied by an apparent increase in compressibility. Raman data are also presented to show further evidence for a second-order structural phase transition as well to demonstrate soft-mode behavior of the B{sub 1g} phonon mode.

• OSTI ID: 20788052
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 73; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCIUM CHLORIDES
CHROMIUM OXIDES
COMPRESSIBILITY
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
PHONONS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RUTILE
SENSITIVITY
SOLIDS
TETRAGONAL LATTICES
X-RAY DIFFRACTION