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Specific heat of metastable Zr1-xSix alloys

Flinspach, Gunter 1; Sürgers, Christoph 1; Löhneysen, Hilbert v.
1 Universität Karlsruhe (TH)

Abstract (englisch):
Non-equilibrium phases in the system Zr 1-x Si x prepared by liquid quenching are superconducting with intermediate electron-phonon coupling as determined from specific heat, low-field DC magnetisation and electrical resistance measurements. Analysis of the authors data clearly shows that amorphous samples (0.12<or=x<or=0.20) are more homogeneous compared to samples of a metastable BCC phase (0.08<or=x<or=0.11). In the latter samples, a minority phase, presumably amorphous, strongly influences the superconducting properties. The concentration dependence of the transition temperature T c of the majority phase is dominated by the electronic density of states. The data at very low temperatures suggest the existence of a linear specific heat contribution which may be due to the presence of two-level tunnelling states in both places.


Originalveröffentlichung
DOI: 10.1088/0953-8984/2/20/002
Scopus
Zitationen: 2
Dimensions
Zitationen: 3
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 1990
Sprache Englisch
Identifikator ISSN: 0953-8984
KITopen-ID: 167690
Erschienen in Journal of Physics: Condensed Matter
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 20
Heft 2
Seiten 4559-4565
Schlagwörter Non-equilibrium phases in the system Zr 1-x Si x prepared by liquid quenching are superconducting with intermediate electron-phonon coupling as determined from specific heat, low-field DC magnetisation and electrical resistance measurements. Analysis of the authors data clearly shows that amorphous samples (0.12<or=x<or=0.20) are more homogeneous compared to samples of a metastable BCC phase (0.08<or=x<or=0.11). In the latter samples, a minority phase, presumably amorphous, strongly influences the superconducting properties. The concentration dependence of the transition temperature T c of the majority phase is dominated by the electronic density of states. The data at very low temperatures suggest the existence of a linear specific heat contribution which may be due to the presence of two-level tunnelling states in both places.
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