Thermoelectric power and transport properties of pure and Al-doped MgB2

Abstract

We have measured the thermoelectric power, S, and resistivity, rho, of pure and Al-doped MgB2. S is positive and increases linearly with temperature above the superconducting transition temperature, Tc. Deviations from the linear dependence appear at higher temperature, T>T0 approx 160 K. Tc and T0 both decrease with Al doping whereas the slope of S(T) in the linear range increases with the Al content. The data are discussed in terms of doping induced changes of the Fermi surface and the density of states at the Fermi level.

10 pages, 2 figures; submitted to Physical Review B (April 2, 2001)

References in corpus (5)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Scanning Tunneling Spectroscopy in MgB2
• High Pressure Study on MgB2
• Calculated elastic and electronic properties of MgB${}_2$ at high pressures

Cited by in corpus (23)

• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• Carbon doping of superconducting magnesium diboride
• Carbon solubility and superconductivity in MgB2
• Effects of Al doping on the structural and electronic properties of Mg(1-x)Al(x)B2
• Superconductivity in the C32 Intermetallic Compounds AAl(2-x)Si(x), with A=Ca and Sr, and 0.6<x<1.2
• Effects of Boron Purity, Mg Stoichiometry and Carbon Substitution on Properties of Polycrystalline MgB${}_2$
• High-pressure synthesis of pure and doped superconducting MgB2 compounds
• Two-band effects in transport properties of MgB2
• Influence of the starting composition on the structural and superconducting properties of MgB2 phase
• Physical Property Characterization of Bulk MgB2 Superconductor
• In-plane Hall effect in c-axis-oriented MgB2 thin films
• Superconducting properties and c-axis superstructure of Mg1-xAlxB2
• Study on the formation of MgB2 phase
• Structural and superconducting properties of MgB${}_{2-x}$Be${}_x$
• Superconducting properties of nanocrystalline MgB${}_2$
• A magnetization and ${}^{11}$B NMR study of Mg${}_{1-x}$Al${}_x$B${}_2$ superconductors
• Aluminium substitution induced superstructures in Mg1-xAlxB2 (x = 0.0 to 0.50): An X-ray diffraction study
• Thermoelectric power of MgB${}_{2-x}$Be${}_x$
• Heat capacity of mesoscopically disordered superconductors:implications to MgB${}_2$
• Anomalous thermoelectric power of Mg1-xAlxB2 system with x = 0.0 to 1.0
• Phase formation and superconductivity of Fe-tube encapsulated and vacuum annealed MgB2
• Band filling and disorder effects on the normal state thermoelectric behavior in MgB2
• Pressure Effects and Large Polarons in Layered MgB_2 Superconductor