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Title: Superconducting state of very thin Pd films deposited on a diluted insulating EuxSr1-xS ferromagnet
Authors: Cosceev, Alexandr
Suergers, Christoph
BOYEN, Hans-Gerhard 
Schweiss, Peter
v Loehneysen, Hilbert
Issue Date: 2011
Source: PHYSICAL REVIEW B, 83(17)
Abstract: The electronic transport in very thin Pd films deposited on insulating EuxSr1-xS (0 <= x <= 1) is investigated. The temperature dependent resistance R(T) of films with d(Pd) >= 14 nm shows metallic behavior and a logarithmic increase toward low temperatures characteristic of (anti-)localization and electron-electron interaction effects also observed for Pd films on Si(111). Films with d(Pd) = 7 nm are superconducting below a transition temperature T-c which decreases with increasing Eu concentration from T-c = 0.9 K for x = 0 to T-c < 50 mK for x = 1. The origin of superconductivity in the thin Pd films is presumably due to the formation of an interfacial Pd-S alloy and/or to a charge transfer at the Pd/EuxSr1-xS interface. The decrease of T-c vs x is attributed to the magnetic pair breaking of the ferromagnetic EuxSr1-xS underneath. The R(T) behavior of films with d(Pd) >= 10 nm suggests that these are not superconducting or have a strongly reduced Tc presumably due to the proximity effect of the nonsuperconducting S-free upper part of the Pd film.
Notes: [Cosceev, Alexandr; Suergers, Christoph; v Loehneysen, Hilbert] Karlsruhe Inst Technol, Inst Phys, D-76049 Karlsruhe, Germany. [Cosceev, Alexandr; Suergers, Christoph; v Loehneysen, Hilbert] DFG Ctr Funct Nanostruct, D-76049 Karlsruhe, Germany. [Boyen, Hans-Gerd] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Schweiss, Peter; v Loehneysen, Hilbert] Karlsruhe Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany.
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ISSN: 1098-0121
DOI: 10.1103/PhysRevB.83.174516
ISI #: 000291005300003
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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