London Penetration Depth and Superfluid Density of Single-crystalline Fe1+y(Te1−xSex)and Fe1+y(Te1−xSx)
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
OSTI ID:984808
The in-plane London penetration depth, {lambda}(T), was measured in single crystals of the iron-chalcogenide superconductors Fe{sub 1.03}(Te{sub 0.63}Se{sub 0.37}) and Fe{sub 1.06}(Te{sub 0.88}S{sub 0.14}) by using a radio-frequency tunnel diode resonator. Similar to the iron-arsenides and in stark contrast to the iron-phosphides, iron-chalcogenides exhibit a nearly quadratic temperature variation of {lambda}(T) at low temperatures. The absolute value of the penetration depth in the T {yields} 0 limit was determined for Fe{sub 1.03}(Te{sub 0.63}Se{sub 0.37}) by using an Al coating technique, giving {lambda}(0) {approx} 560 {+-} 20 nm. The superfluid density {rho}{sub s}(T) = {lambda}{sup 2}(0)/{lambda}{sup 2}(T) was fitted with a self-consistent two-gap {gamma} model. While two different gaps are needed to describe the full-range temperature variation in {rho}s(T), a nonexponential low-temperature behavior requires pair-breaking scattering, and therefore an unconventional (e.g., s or nodal) order parameter.
- Research Organization:
- BROOKHAVEN NATIONAL LABORATORY (BNL)
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 984808
- Report Number(s):
- BNL--93796-2010-JA; KC0202010
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 81; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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