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Measurement of Conduction-Electron Polarization via the Pairing Resonance Y. M. Xiong and P. W. Adams
 

Summary: Measurement of Conduction-Electron Polarization via the Pairing Resonance
Y. M. Xiong and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
G. Catelani
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
(Received 15 June 2009; published 7 August 2009)
We show that the pairing resonance in the Pauli-limited normal state of ultrathin superconducting Al
films provides a spin-resolved probe of conduction-electron polarization in thin magnetic films. A
superconductor-insulator-ferromagnet tunneling junction is used to measure the density of states in
supercritical parallel magnetic fields that are well beyond the Clogston-Chandresekhar limit, thus greatly
extending the field range of the tunneling density of states technique. The applicability and limitations of
using the pairing resonance as a spin probe are discussed.
DOI: 10.1103/PhysRevLett.103.067009 PACS numbers: 74.50.+r, 74.78.Db, 75.70.Ak, 85.75.Ąd
The possibility of incorporating spin degrees of freedom
into electronic technologies has led to an explosion in
research into mechanisms of spin polarization of conduc-
tion currents in semiconducting and metallic systems [1,2].
In addition to being technologically important, spin polar-
ization in conducting systems remains a fundamentally
interesting many-body problem. Clearly, an accurate de-

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science