Raman spectrum and lattice parameters ofMgB2as a function of pressure

2001/04/04 by Alexander F. Goncharov, Viktor V. Struzhkin, Eugene Gregoryanz +9 · 3 citations
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.64.100509

3 pages, 3 figures

arxiv created 2001/04/04 · openalex publication_date 2001/08/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report Raman spectra and synchrotron x-ray diffraction measurements of lattice parameters of polycrystalline MgB₂ under hydrostatic pressure conditions up to 15 GPa. An anomalously broadened Raman band at 620cm^\ensuremath-1 is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gr"uneisen parameter indicate the vibration is highly anharmonic, broadly consistent with theoretical predictions for the E_2g in-plane boron stretching mode. The results obtained may provide additional constraints on the electron-phonon coupling in the system.

Cited by

• Dependence of the superconducting transition temperature of single and polycrystalline MgB2 on hydrostatic pressure
• Disorder-induced collapse of the electron-phonon coupling inMgB2observed by Raman spectroscopy
• Pressure effect on the magnetic penetration depth inMgB2