Projects per year
Abstract
In a superconductor, the ratio of the carrier density, n, to its effective mass, m*, is a fundamental property directly reflecting the length scale of the superfluid flow, the London penetration depth, lambda(L). In twodimensional systems, this ratio n/m* (similar to 1/lambda(2)(L)) determines the effective Fermi temperature, TF. We report a sharp peak in the xdependence of lambda(L) at zero temperature in clean samples of BaFe2(As1xPx)(2) at the optimum composition x = 0.30, where the superconducting transition temperature Tc reaches a maximum of 30 kelvin. This structure may arise from quantum fluctuations associated with a quantum critical point. The ratio of Tc/TF at x = 0.30 is enhanced, implying a possible crossover toward the BoseEinstein condensate limit driven by quantum criticality.
Original language  English 

Pages (fromto)  15541557 
Number of pages  4 
Journal  Science 
Volume  336 
Issue number  6088 
DOIs  
Publication status  Published  22 Jun 2012 
Keywords
 HIGHTC
 QUANTUM CRITICALITY
 SUPERCONDUCTORS
 CROSSOVER
 BCS
Fingerprint Dive into the research topics of 'A Sharp Peak of the ZeroTemperature Penetration Depth at Optimal Composition in BaFe<sub>2</sub>(As<sub>1x</sub>P<sub>x</sub>)<sub>2</sub>'. Together they form a unique fingerprint.
Projects
 1 Finished

Normal and superconducting state electronic structure of iron based superconductors
1/09/10 → 1/09/14
Project: Research