Unconventional London Penetration Depth in Single-Crystal Ba(Fe0.93Co0.07)2As2 Superconductors
R. T. Gordon, N. Ni, C. Martin, M. A. Tanatar, M. D. Vannette, H. Kim, G. D. Samolyuk, J. Schmalian, S. Nandi, A. Kreyssig, A. I. Goldman, J. Q. Yan, S. L. Bud’ko, P. C. Canfield, R. Prozorov
DOI 10.1103/PhysRevLett.102.127004 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The London penetration depth λ(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of λ(T) follows a power law, Δλ(T)∼Tn with n≈2.4±0.1, indicating the existence of normal quasiparticles down to at least 0.02Tc. This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1−xFx and SmFeAsO1−xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.93Co0.07)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | zero_resistance |
| Ba(Fe0.93Co0.07)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
| LaFeAs(O1-xFx) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| SmFeAs(O1-xFx) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
Similar papers
Anisotropy in the Electrical Resistivity and Susceptibility of Superconducting BaFe2As2 Single Crystals
similarity 0.94X. F. Wang et al.
Source status unknown — claims are unverified
Nonexponential London penetration depth of external magnetic fields in superconducting Ba1−xKxFe2As2 single crystals
similarity 0.94C. Martin et al.
Source status unknown — claims are unverified
Appearance of pressure-induced superconductivity in BaFe2As2 under hydrostatic conditions and its extremely high sensitivity to uniaxial stress
similarity 0.93Takehiro Yamazaki et al.
Source status unknown — claims are unverified
Superconductivity in LaFe1−xCoxAsO
similarity 0.93Athena S. Sefat et al.
Source status unknown — claims are unverified
Superconductivity at 23 K and low anisotropy in Rb-substituted BaFe2As2 single crystals
similarity 0.93Z. Bukowski et al.
Source status unknown — claims are unverified
Superconductivity above 50 K in Tb1−xThxFeAsO
similarity 0.93Lin-Jun Li et al.
Source status unknown — claims are unverified