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Possible nodal superconducting gap in Fe1+y(Te1-xSex) single crystals from ultralow temperature penetration depth measurements.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Sep2013, Vol. 88 Issue 10, p104502-1-104502-7. 7p. - Publication Year :
- 2013
-
Abstract
- Using a radio-frequency tunnel diode oscillator technique, we measured the temperature dependence of the in-plane London penetration depth Δλah(T) in Fe1+y(Te1-xSex) single crystals, down to temperatures as low as 50 mK. A significant number of samples, with nominal Se concentrations x = 0.36, 0.40, 0.43, and 0.45, respectively, were studied and in many cases we found that Δλah(T) shows an upturn below 0.7 K, indicative of a paramagnetic-type contribution. After subtracting the magnetic background, the low-temperature behavior of penetration depth is best described by a power law with exponent n ≈ 2 and with no systematic dependence on the Se concentration. Most importantly, in the limit of T → 0, in some samples we observed a narrow region of linear temperature dependence of penetration depth, suggestive of nodes in the superconducting gap of Fe1+y(Te1-xSex). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 88
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 91682187
- Full Text :
- https://doi.org/10.1103/PhysRevB.88.104502