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Joshi, Amish G and Kryukov, Sergiy A. and De Long, Lance E. and González Herrera, Elvira María and Navarro Palma, Elena and Villegas, Javier E. and Vicent López, José Luis (2007) Magnetic instabilities along the superconducting phase boundary of Nb/Ni multilayers. Journal of applied physics, 101 (9). ISSN 0021-8979
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Official URL: http://dx.doi.org/10.1063/1.2714302
Abstract
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.
Item Type: | Article |
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Additional Information: | © 2007 American Institute of Physics. |
Uncontrolled Keywords: | Superlattices; Transition; Vortices; Lattices; State; Field |
Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics |
ID Code: | 45050 |
Deposited On: | 02 Nov 2017 11:10 |
Last Modified: | 02 Nov 2017 11:10 |
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