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Interband Pairing Interaction in Magnesium Diboride Probed by Tunneling Spectroscopy (2006)

Schneider, Rudolf ; Geerk, Jochen ; Zaitsev, Alexander G. ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Advances in science and technology Vol. 47 (Oct. 2006), p. 69-74

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ISSN: 1662-0356

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Natural Sciences in General , Technology

Notes: We report on the study of the interband pairing interaction in the two-bandsuperconductor MgB2 by tunneling spectroscopy using thin film tunnel junctions. The filmswere deposited in situ by an approach comprising a conventional planar B sputter gun and aspecial homemade Mg evaporator providing a high vapor pressure. For the tunnelingexperiments sandwich-type crossed-strip tunnel junctions with a native MgB2 oxide as thepotential barrier and Al, In or Pb counterelectrodes were prepared. Voltage-dependentdifferential conductance measurements revealed estimates of the barrier thickness and heightof 1.5 nm and 1.6 eV, respectively, and allowed us to determine the phonon-inducedstructures in the tunneling density of states of the phonon-mediated superconductor MgB2.The analysis of the reduced density of states using the standard single-band Eliashbergequations yielded an effective electron-phonon spectral function accounting for the smallerenergy gap. A further analysis involving ab-initio LDA calculations and the two-bandEliashberg equations revealed that the dominant feature in the effective spectral function, astrong peak at 58 meV, was mainly due to the interband pairing interaction

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.47.69.pdf

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Magnetic order and transport in the heavy-fermion system CeCu Au (1998)

von Löhneysen, H. ; Neubert, A. ; Pietrus, T. ; [et al.]

Springer

The European physical journal 5 (1998), S. 447-455

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ISSN: 1434-6036

Keywords: PACS. 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena - 75.25.+z Spin arrangements in magnetically ordered materials - 72.15.Eb Electrical and thermal conduction in crystalline metals and alloys

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: We report on extensive elastic neutron scattering to determine the wave vector of the magnetic order in CeCu6-xAux single crystals for x 〉 0.1. For all values of x investigated (0.2, 0.3, 0.5, 1.0) we find long-range incommensurate antiferromagnetic order with an ordering vector (0.625 0.275) for x =0.2, nearly unchanged for x =0.3, and (0.59) for x =0.5, staying roughly the same for x =1.0. In addition, short-range correlations are observed for x =0.2, reminiscent of those found previously for x =0.1. The ordered magnetic moment is found to increase rapidly for small x, and more slowly for the larger x values. The increase of the specific-heat anomaly at the ordering temperature with x is in qualitative accord with this behavior. Finally, data of the electrical resistivity for current flow along the three crystallographic directions are presented, showing a clear signature of the magnetic order. A theoretical interpretation of the interplay of magnetic order and transport in terms of (i) the partial suppression of the Kondo effect by the staggered magnetization and (ii) the anisotropic band structure induced by the staggered field is shown to account well for the data, provided the ordering vector is close to 2 k F, where k F is a typical Fermi momentum.