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Orbital Response Of Evanescent Cooper Pairs in Paramagnetically Limited Al Films X. S. Wu and P. W. Adams
 

Summary: Orbital Response Of Evanescent Cooper Pairs in Paramagnetically Limited Al Films
X. S. Wu and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
G. Catelani
Physics Department, Columbia University, New York, New York 10027, USA
(Received 16 March 2005; revised manuscript received 14 June 2005; published 10 October 2005)
We report a detailed study of the pairing resonance via tunneling density of states in ultrathin
superconducting Al films in supercritical magnetic fields. Particular emphasis is placed on the effects
of the perpendicular component of the magnetic field on the resonance energy and magnitude. Though the
resonance is broadened and attenuated by H? as expected, its energy is shifted upward linearly with H?.
Extension of the original theory of the resonance to include strong perpendicular fields shows that at
sufficiently large H? the overlap of the broadened resonance tail with the underlying degenerate Fermi sea
alters the spectral distribution of the resonance via the exclusion principle. This leads to the shift of the
resonance feature to higher energy.
DOI: 10.1103/PhysRevLett.95.167001 PACS numbers: 74.25.Qt, 74.25.Op, 74.40.+k
Though superconductivity is one of the most ubiquitous
and extensively studied phenomenon in condensed matter
physics, little is known about how an attractive electron-
electron interaction mode, whether mediated by phonons
or some more exotic coupling, evolves from a noncoherent

  

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

 

Collections: Materials Science