Positive Curvature of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi><mi></mi><mn>2</mn></mrow></msub></mrow></math></span>-versus-<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span> Boundaries in Layered Superconductors

John A. Woollam; Robert B. Somoano; Paul O'Connor

doi:10.1103/PhysRevLett.32.712

Positive Curvature of the $H_{c 2}$ -versus- $T_{c}$ Boundaries in Layered Superconductors

John A. Woollam, Robert B. Somoano, and Paul O'Connor

Phys. Rev. Lett. 32, 712 – Published 1 April 1974

Abstract

We have found what we believe to be a universal characteristic of layered superconductors: A positive curvature of the $H_{c 2}$ -versus- $T_{c}$ boundary. The origins of the effect are believed to be associated with strong anisotropies of the Fermi surface and electronphonon interaction.

Received 3 December 1973

DOI:https://doi.org/10.1103/PhysRevLett.32.712

Authors & Affiliations

John A. Woollam

National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio 44135

Robert B. Somoano^*

Jet Propulsion Laboratory, Pasadena, California 91103

Paul O'Connor^†

Oberlin College, Oberlin, Ohio 44074

^*Jet Propulsion Laboratory part of this research sponsored by the National Aeronautics and Space Administration under contract No. NAS7-100.
^†Winter term student at the National Aeronautics and Space Administration Lewis Research Center during January 1974.