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

doi:10.1103/PhysRevLett.106.067001

Local measurement of the superfluid density in the pnictide superconductor Ba(Fe_1-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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	067001
Number of pages	4
Journal	Physical Review Letters
Volume	106
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.106.067001
Publication status	Published - 9 Feb 2011

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Luanetal2011PhysRevLett 106e067001
© 2011 American Physical Society
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title = "Local measurement of the superfluid density in the pnictide superconductor Ba(Fe1-xCox2)As2 across the superconducting dome",

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.",

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AU - Luan, Lan

AU - Lippman, Thomas M

AU - Hicks, Clifford William

AU - Bert, Julie A

AU - Auslaender, Ophir M

AU - Chu, Jiun-Haw

AU - Analytis, James G

AU - Fisher, Ian R

AU - Moler, Kathryn A

PY - 2011/2/9

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N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.106.067001

M3 - Article

SN - 0031-9007

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

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ER -

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

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Local measurement of the superfluid density in the pnictide superconductor Ba(Fe_1-xCox₂)As₂ across the superconducting dome