Study of temperature dependent atomic correlations in MgB${}_2$

Abstract

We have studied the evolution with temperature of the local as well as the average crystal structure of MgB${}_2$ using the real-space atomic pair distribution function (PDF) measured by high resolution neutron powder diffraction. We have investigated the correlations of the B-B and B-Mg nearest neighbor pair motion by comparing, in the wide temperature range from T=10 K up to T=600 K, the mean-square displacements (MSD) of single atoms with the mean-square relative displacements (MSRD) obtained from the PDF peak linewidths. The results show that the single atom B and Mg vibrations are mostly decoupled from each other, with a small predominance of positive (in phase) correlation factor for both the B-B and B-Mg pairs. The small positive correlation is almost temperature independent, in contrast with our theoretical calculations; this can be a direct consequence of the strong decay processes of the $E_{2g}$ anharmonic phonons.

References in corpus (21)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Superconductivity of MgB2: Covalent Bonds Driven Metallic
• Electron-phonon interaction in the normal and superconducting states of MgB2
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Specific Heat of Mg ^{11}B_2
• Phonon dispersion and electron-phonon coupling in MgB_2 and AlB_2
• Giant anharmonicity and non-linear electron-phonon coupling in MgB${}_2$; A combined first-principles calculations and neutron scattering study
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• First-Principles Calculation of the Superconducting Transition in MgB2 within the Anisotropic Eliashberg Formalism
• Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
• Phonon Density-of-States in MgB2
• Lattice dynamics and correlated atomic motion from the atomic pair distribution function
• Phonon dispersion and lifetimes in MgB2
• Definitive experimental evidence for two-band superconductivity in MgB2
• Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering
• Small Fermi energy and phonon anharmonicity in MgB_2 and related compounds
• High Tc superconductivity at a critical strain and charge density in diborides
• Small Fermi energy, zero point fluctuations and nonadiabaticity in MgB${}_2$
• Two-Band-Type Superconducting Instability in MgB2
• Superconductivity Driven by the Interband Coulomb Interaction and Implications for the Superconducting Mechanism of MgB2
• Limits on phonon information extracted from neutron pair-density functions

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