Measurement of Conduction Electron Polarization Via the Pairing Resonance

Details Measurement of Conduction Electron Polarization Via the Pairing Resonance Measurement of Conduction Electron Polarization Via the Pairing Resonance

2009-07-10

arxiv.org/abs/0907.1800v1

Phys. Rev. Lett. 103, 067009 (2009)

Physics

Condensed Matter

Superconductivity

4 figures; to appear in PRL

Scientific paper

10.1103/PhysRevLett.103.067009

We show that the pairing resonance in the Pauli-limited normal state of ultra-thin 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.

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