London penetration depth and superfluid density of single-crystalline Fe1+y ( Te1-x Sex ) and Fe1+y ( Te1-x Sx )

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

Research output: Contribution to journalArticle

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Abstract

The in-plane London penetration depth, λ (T), was measured in single crystals of the iron-chalcogenide superconductors Fe1.03 (Te 0.63 Se0.37) and Fe1.06 (Te0.88 S0.14) 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 Fe1.03 (Te0.63 Se 0.37) by using an Al coating technique, giving λ (0) 560±20 nm. The superfluid density ρs (T) = λ2 (0) / λ2 (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 ρs (T), a nonexponential low-temperature behavior requires pair-breaking scattering, and therefore an unconventional (e.g., s± or nodal) order parameter.

Original languageEnglish (US)
Article number180503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number18
DOIs
StatePublished - May 10 2010

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penetration
Iron
Crystalline materials
iron
arsenides
Tunnel diodes
tunnel diodes
Chalcogenides
Temperature
phosphides
Coating techniques
chalcogenides
Superconducting materials
coating
Resonators
radio frequencies
resonators
Single crystals
Scattering
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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-x Sex ) and Fe1+y ( Te1-x Sx ). In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 18.
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Kim, H, Martin, C, Gordon, RT, Tanatar, MA, Hu, J, Qian, B, Mao, ZQ, Hu, R, Petrovic, C, Salovich, N, Giannetta, R & Prozorov, R 2010, 'London penetration depth and superfluid density of single-crystalline Fe1+y ( Te1-x Sex ) and Fe1+y ( Te1-x Sx )', Physical Review B - Condensed Matter and Materials Physics, vol. 81, no. 18, 180503. https://doi.org/10.1103/PhysRevB.81.180503

London penetration depth and superfluid density of single-crystalline Fe1+y ( Te1-x Sex ) and Fe1+y ( Te1-x Sx ). / 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.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 18, 180503, 10.05.2010.

Research output: Contribution to journalArticle

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T1 - London penetration depth and superfluid density of single-crystalline Fe1+y ( Te1-x Sex ) and Fe1+y ( Te1-x Sx )

AU - Kim, H.

AU - Martin, C.

AU - Gordon, R. T.

AU - Tanatar, M. A.

AU - Hu, J.

AU - Qian, B.

AU - Mao, Z. Q.

AU - Hu, Rongwei

AU - Petrovic, C.

AU - Salovich, N.

AU - Giannetta, R.

AU - Prozorov, R.

PY - 2010/5/10

Y1 - 2010/5/10

N2 - The in-plane London penetration depth, λ (T), was measured in single crystals of the iron-chalcogenide superconductors Fe1.03 (Te 0.63 Se0.37) and Fe1.06 (Te0.88 S0.14) 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 Fe1.03 (Te0.63 Se 0.37) by using an Al coating technique, giving λ (0) 560±20 nm. The superfluid density ρs (T) = λ2 (0) / λ2 (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 ρs (T), a nonexponential low-temperature behavior requires pair-breaking scattering, and therefore an unconventional (e.g., s± or nodal) order parameter.

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