Lattice Properties of MgB2 versus Temperature and Pressure

Abstract

We have determined the structural properties of the superconducting compound MgB2 as a function of temperature from 11 K to 297 K and as a function of hydrostatic pressure up to 0.62 GPa using neutron powder diffraction. This compound, when compared to other diborides with the same structure, is characterized by unusually large anisotropies of both the thermal expansion and compressibility, with the c-axis responses being substantially larger in both cases. We speculate that the comparatively weaker metal-boron bonding in MgB2, manifest by these lattice responses, is important for establishing the structural features that give rise to high Tc superconductivity in this structure type.

14 pages, 5 figures

References in corpus (2)

• Superconductivity of metallic boron in MgB_2
• Superconductivity of MgB2: Covalent Bonds Driven Metallic

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• The Dependence of Tc on Hydrostatic Pressure in Superconducting MgB2
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• Absence of a structural transition up to 40 Gpa in MgB2 and the relevance of magnesium non-stoichiometry
• The band structure of MgB${}_2$ with different lattice constants
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• Superconductivity of magnesium diboride
• Dependence of the Superconducting Transition Temperature of MgB2 on Pressure to 20 GPa
• Enhanced Critical parameters of nano-Carbon doped MgB2 Superconductor
• Dielectric functions and collective excitations in MgB_2
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• Dependence of the flux creep activation energy on current density and magnetic field for MgB2 superconductor
• Effects of pressure on the superconducting properties of magnesium diboride
• Crystal growth and characterization of MgB2: Relation between structure and superconducting properties
• Surface and Image-Potential States on the MgB_2(0001) Surfaces
• A search for incipient lattice instabilities in MgB${}_2$ by anelastic spectroscopy
• Pressure and isotope effect on the anisotropy of MgB${}_2$
• Comparative Study of the Electronic Structure of Alkaline-earth Borides (MeB2; Me=Mg, Al, Zr, Nb, and Ta) and their Normal-State Conductivity
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• Influence of carbon-ion irradiation on the superconducting critical properties of MgB${}_2$ thin films
• Possible superlattice formation in high-temperature treated carbonaceous MgB2 at elevated pressure
• Coexistence of Eu-antiferromagnetism and pressure-induced superconductivity in EuFe2As2 single crystal
• Pressure Effects and Large Polarons in Layered MgB_2 Superconductor