RT Journal Article
T1 Magnetic instabilities along the superconducting phase boundary of Nb/Ni multilayers
A1 Joshi, Amish G
A1 Kryukov, Sergiy A.
A1 De Long, Lance E.
A1 González Herrera, Elvira María
A1 Navarro Palma, Elena
A1 Villegas, Javier E.
A1 Vicent López, José Luis
AB We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Delta T(C)(H)approximate to 0.01-0.7 K, for a [Nb(23 nm)/Ni(5 nm)](5) multilayer (ML) in dc magnetic fields applied nearly parallel to the ML plane. The vibrating reed data exhibit reproducible structures below T(C) that may reflect multiple SC transitions, but they are sensitive to ac field amplitude and dc field orientation. This striking behavior poses challenges for theoretical and experimental investigations of interfaces between SC and ferromagnetic layers that involve magnetic pair breaking effects, "pi phase shifts" of the SC order parameter, and exotic ("LOFF") pairing states. Alternatively, the anomalies may mark dynamical instabilities within a confined, strongly anisotropic Abrikosov vortex lattice.
PB American Institute of Physics
SN 0021-8979
YR 2007
FD 2007-05-01
LK https://hdl.handle.net/20.500.14352/52121
UL https://hdl.handle.net/20.500.14352/52121
LA eng
NO © 2007 American Institute of Physics.Research at University of Kentucky supported by U.S. Department of Energy and Kentucky Science and Engineering Foundation. Research at Universidad Complutense supported by Spanish Ministerio de Educacion y Ciencia, Comunidad de Madrid y Santander-UCM. One of the authors (A.G.J.) was supported by an Indian Department of Science and Technology BOYSCAST Fellowship No. SR/BY/P-01/ 04.
NO Spanish Ministerio de Educacion y Ciencia
NO Comunidad de Madrid
NO Santander-UCM
DS Docta Complutense
RD 27 abr 2025