Raman spectrum and lattice parameters of MgB2 as a function of pressure

AF Goncharov; VV Struzhkin; E Gregoryanz; JZ Hu; RJ Hemley; HK Mao; G Lapertot; SL Bud'ko; PC Canfield

doi:10.1103/PhysRevB.64.100509

Raman spectrum and lattice parameters of MgB2 as a function of pressure

AF Goncharov, VV Struzhkin, E Gregoryanz, JZ Hu, RJ Hemley, HK Mao, G Lapertot^*, SL Bud'ko, PC Canfield

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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 620 cm(-1) is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen 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.

Original language	English
Article number	100509
Number of pages	4
Journal	Physical Review B (Condensed Matter)
Volume	64
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.64.100509
Publication status	Published - 1 Sept 2001

Keywords / Materials (for Non-textual outputs)

GRUNEISEN PARAMETERS
STATE
SCATTERING
EQUATIONS
MODES

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10.1103/PhysRevB.64.100509

Cite this

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title = "Raman spectrum and lattice parameters of MgB2 as a function of pressure",

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 620 cm(-1) is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen 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.",

keywords = "GRUNEISEN PARAMETERS, STATE, SCATTERING, EQUATIONS, MODES",

author = "AF Goncharov and VV Struzhkin and E Gregoryanz and JZ Hu and RJ Hemley and HK Mao and G Lapertot and SL Bud'ko and PC Canfield",

year = "2001",

month = sep,

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doi = "10.1103/PhysRevB.64.100509",

language = "English",

volume = "64",

journal = "Physical Review B (Condensed Matter)",

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T1 - Raman spectrum and lattice parameters of MgB2 as a function of pressure

AU - Goncharov, AF

AU - Struzhkin, VV

AU - Gregoryanz, E

AU - Hu, JZ

AU - Hemley, RJ

AU - Mao, HK

AU - Lapertot, G

AU - Bud'ko, SL

AU - Canfield, PC

PY - 2001/9/1

Y1 - 2001/9/1

N2 - 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 620 cm(-1) is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen 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.

AB - 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 620 cm(-1) is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen 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.

KW - GRUNEISEN PARAMETERS

KW - STATE

KW - SCATTERING

KW - EQUATIONS

KW - MODES

U2 - 10.1103/PhysRevB.64.100509

DO - 10.1103/PhysRevB.64.100509

M3 - Article

SN - 0163-1829

VL - 64

JO - Physical Review B (Condensed Matter)

JF - Physical Review B (Condensed Matter)

IS - 10

M1 - 100509

ER -

Raman spectrum and lattice parameters of MgB2 as a function of pressure

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Keywords / Materials (for Non-textual outputs)

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