London penetration depth and superfluid density of single-crystalline Fe1+y(Te1-xSex) and Fe1+y(Te1-xSx)

Kim, H.; Martin, C.; Gordon, R. T.; Tanatar, M. A.; Hu, J.; Qian, B.; Mao, Z. Q.; Hu, Rongwei; Petrovic, C.; Salovich, N.; Giannetta, R.; Prozorov, R.

doi:10.1103/PhysRevB.81.180503

London penetration depth and superfluid density of single-crystalline ${Fe}_{1 + y} ({Te}_{1 - x} {Se}_{x})$ and ${Fe}_{1 + y} ({Te}_{1 - x} S_{x})$

Journal Article · Sat May 01 04:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.81.180503· OSTI ID:1385910

Kim, H.; Martin, C.; Gordon, R. T.; Tanatar, M. A.; Hu, J.; Qian, B.; Mao, Z. Q.; Hu, Rongwei; Petrovic, C.; Salovich, N.; Giannetta, R.; Prozorov, R.

The in-plane London penetration depth, λ ( T ) , was measured in single crystals of the iron-chalcogenide superconductors Fe 1.03 ( Te 0.63 Se 0.37 ) and Fe 1.06 ( Te 0.88 S 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 λ ( T ) at low temperatures. The absolute value of the penetration depth in the T → 0 limit was determined for Fe 1.03 ( Te 0.63 Se 0.37 ) by using an Al coating technique, giving λ ( 0 ) ≈ 560 ± 20 nm . The superfluid density ρ s ( T ) = λ 2 ( 0 ) / λ 2 ( T ) was fitted with a self-consistent two-gap γ model. While two different gaps are needed to describe the full-range temperature variation in ρ s ( T ) , a nonexponential low-temperature behavior requires pair-breaking scattering, and therefore an unconventional (e.g., s ± or nodal) order parameter.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385910

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; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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