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Title: 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 )

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1385910
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 18; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; phonons; thermal conductivity; energy storage (including batteries and capacitors); superconductivity; defects; spin dynamics

Citation Formats

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., and Prozorov, R. London penetration depth and superfluid density of single-crystalline Fe1+y(Te1-xSex) and Fe1+y(Te1-xSx). United States: N. p., 2010. Web. doi:10.1103/PhysRevB.81.180503.
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. London penetration depth and superfluid density of single-crystalline Fe1+y(Te1-xSex) and Fe1+y(Te1-xSx). United States. https://doi.org/10.1103/PhysRevB.81.180503
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., and Prozorov, R. Sat . "London penetration depth and superfluid density of single-crystalline Fe1+y(Te1-xSex) and Fe1+y(Te1-xSx)". United States. https://doi.org/10.1103/PhysRevB.81.180503.
@article{osti_1385910,
title = {London penetration depth and superfluid density of single-crystalline Fe1+y(Te1-xSex) and Fe1+y(Te1-xSx)},
author = {Kim, H. and Martin, C. and Gordon, R. T. and Tanatar, M. A. and Hu, J. and Qian, B. and Mao, Z. Q. and Hu, Rongwei and Petrovic, C. and Salovich, N. and Giannetta, R. and Prozorov, R.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.81.180503},
url = {https://www.osti.gov/biblio/1385910}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 18,
volume = 81,
place = {United States},
year = {2010},
month = {5}
}

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