Magnetic instabilities along the superconducting phase boundary of NbNi multilayers

Amish G. Joshi; Sergiy A. Kryukov; Lance E. De Long; Elvira M. Gonzalez; Elena Navarro; Javier E. Villegas; Jose L. Vicent

doi:10.1063/1.2714302

Magnetic instabilities along the superconducting phase boundary of NbNi multilayers

Amish G. Joshi, Sergiy A. Kryukov, Lance E. De Long, Elvira M. Gonzalez, Elena Navarro, Javier E. Villegas, Jose L. Vicent

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Δ TC (H) ≈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 TC 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.

Original language	English
Article number	09G117
Journal	Journal of Applied Physics
Volume	101
Issue number	9
DOIs	https://doi.org/10.1063/1.2714302
State	Published - 2007

Bibliographical note

Funding Information:
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.

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.2714302

Cite this

@article{0c1d08e5ea804e2b859ff359a0c9ae2a,

title = "Magnetic instabilities along the superconducting phase boundary of NbNi multilayers",

abstract = "We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Δ TC (H) ≈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 TC 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.",

author = "Joshi, {Amish G.} and Kryukov, {Sergiy A.} and {De Long}, {Lance E.} and Gonzalez, {Elvira M.} and Elena Navarro and Villegas, {Javier E.} and Vicent, {Jose L.}",

note = "Funding Information: 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.",

year = "2007",

doi = "10.1063/1.2714302",

language = "English",

volume = "101",

number = "9",

}

TY - JOUR

T1 - Magnetic instabilities along the superconducting phase boundary of NbNi multilayers

AU - Joshi, Amish G.

AU - Kryukov, Sergiy A.

AU - De Long, Lance E.

AU - Gonzalez, Elvira M.

AU - Navarro, Elena

AU - Villegas, Javier E.

AU - Vicent, Jose L.

N1 - Funding Information: 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.

PY - 2007

Y1 - 2007

N2 - We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Δ TC (H) ≈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 TC 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.

AB - We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Δ TC (H) ≈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 TC 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.

UR - http://www.scopus.com/inward/record.url?scp=34248525146&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34248525146&partnerID=8YFLogxK

U2 - 10.1063/1.2714302

DO - 10.1063/1.2714302

M3 - Article

AN - SCOPUS:34248525146

SN - 0021-8979

VL - 101

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

M1 - 09G117

ER -

Magnetic instabilities along the superconducting phase boundary of NbNi multilayers

Abstract

Bibliographical note

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this