The Elastic and Vibrational Properties of Co to 120 GPa

Journal Article · Fri Nov 21 00:00:00 EST 2003 · Physical Review Letters

OSTI ID:15013730

Crowhurst, J; Goncharov, A F; Zaug, J M

Impulsive stimulated light scattering and Raman spectroscopy measurements have been made on hcp cobalt to a static pressure of 120 GPa. This is the highest static pressure to date at which acoustic velocities have been directly measured. We find that at pressures above 60 GPa the shear elastic modulus and the Raman frequency of the E{sub 2g} transverse optical phonon exhibit a departure from a linear dependence on density. We relate this behavior to a collapse of the magnetic moment under pressure that has been predicted theoretically, but until now not observed experimentally.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15013730
• Report Number(s): UCRL-JRNL-201146; PRLTAO; TRN: US200803%%1082
• Journal Information: Physical Review Letters, Vol. 92, Issue 11; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
58 GEOSCIENCES
36 MATERIALS SCIENCE
ACOUSTICS
COBALT
LIGHT SCATTERING
MAGNETIC MOMENTS
PHONONS
RAMAN SPECTROSCOPY
SHEAR