BCS Theory of Superconductivity Explains Universal Behavior

Highlight Date: 
11/11/2013
Display Section: 
Broad Audience Highlights
Article Title: 
Homes Scaling and BCS
Author(s): 
V. G. Kogan
Article Link: 
Journal Name: 
Physical Review B
Volume: 
87
Year: 
2013
Page Number(s): 
220507
Highlight Text: 

A recent discovery suggested to be a universal behavior of superconductors does not require a fancy new explanation; it elegantly falls out from the BCS theory of superconductivity, first published in 1957.The universal behavior is scaling relationship, known as Homes scaling, that relates the penetration depth of the magnetic field to the superconducting transition temperature and conductivity.  It is valid over many orders of magnitude from the so-called “dirty”, short mean-free path, superconductors up to as clean materials as one can synthesize. Thus, Homes scaling can be considered another confirmation of BCS theory, if any is still needed.