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Pair-breaking mechanisms in Nb/Gd/Nb films

Strunk, Christoph; Paschen, Uwe; Sürgers, Christoph; Löhneysen, Hilbert von

Abstract:
Several series of Nb/Gd/Nb triple layers have been grown in UHV by e--beam evaporation onto sapphire (1120) substrates at 300 K. The superconducting transitions have been measured resistively and by dc-susceptibility, the ferromagnetic transition with the transverse magnetooptical Kerr effect. The Gd layers show long-range ferromagnetic order only above a layer thickness of 20 Å, which is attributed to the formation of a discontinuous film below this thickness. The superconducting properties of the films reflect this transition by a sudden decrease in the Tc(dGd)-curve with increasing dGd. This result indicates that pair breaking by the bulk-Gd exchange field is much more effective than pair breaking by spin-flip scattering. Depending on the thickness of the Nb layers, Tc(dGd) saturates for large values of dGd at a finite temperature or tends to zero.


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 1994
Sprache Englisch
Identifikator ISSN: 0921-4526
KITopen ID: 259594
Erschienen in Physica B: Physics of Condensed Matter
Band 194-196
Heft 2
Seiten 2403-2404
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