Local measurement of the superfluid density in the pnictide superconductor Ba(Fe1-xCox2)As2 across the superconducting dome

Lan Luan, Thomas M Lippman, Clifford William Hicks, Julie A Bert, Ophir M Auslaender, Jiun-Haw Chu, James G Analytis, Ian R Fisher, Kathryn A Moler

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

We measure the penetration depth λab(T) in Ba(Fe1-xCox)2As2 using local techniques that do not average over the sample. The superfluid density ρs(T)≡1/λab(T)2 has three main features. First, ρs(T=0) falls sharply on the underdoped side of the dome. Second, λab(T) is flat at low T at optimal doping, indicating fully gapped superconductivity, but varies more strongly in underdoped and overdoped samples, consistent with either a power law or a small second gap. Third, ρs(T) varies steeply near Tc for optimal and underdoping. These observations are consistent with an interplay between magnetic and superconducting phases.
Original languageEnglish
Article number067001
Number of pages4
JournalPhysical Review Letters
Volume106
Issue number6
DOIs
Publication statusPublished - 9 Feb 2011

Fingerprint

Dive into the research topics of 'Local measurement of the superfluid density in the pnictide superconductor Ba(Fe1-xCox2)As2 across the superconducting dome'. Together they form a unique fingerprint.

Cite this