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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
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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