Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors

R. T. Gordon; N. Ni; C. Martin; M. A. Tanatar; M. D. Vannette; H. Kim; G. D. Samolyuk; J. Schmalian; S. Nandi; A. Kreyssig; A. I. Goldman; J. Q. Yan; S. L. Bud'Ko; P. C. Canfield; R. Prozorov

doi:10.1103/PhysRevLett.102.127004

Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors

R. T. Gordon, N. Ni, C. Martin, M. A. Tanatar, M. D. Vannette, H. Kim, G. D. Samolyuk, J. Schmalian, S. Nandi, A. Kreyssig, A. I. Goldman, J. Q. Yan, S. L. Bud'Ko, P. C. Canfield, R. Prozorov

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Abstract

The London penetration depth λ(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of λ(T) follows a power law, Δλ(T)∼Tn with n/2.4±0.1, indicating the existence of normal quasiparticles down to at least 0.02Tc. This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.

Original language	English
Article number	127004
Journal	Physical Review Letters
Volume	102
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.102.127004
State	Published - Mar 23 2009
Externally published	Yes

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Gordon, R. T., Ni, N., Martin, C., Tanatar, M. A., Vannette, M. D., Kim, H., Samolyuk, G. D., Schmalian, J., Nandi, S., Kreyssig, A., Goldman, A. I., Yan, J. Q., Bud'Ko, S. L., Canfield, P. C., & Prozorov, R. (2009). Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors. Physical Review Letters, 102(12), Article 127004. https://doi.org/10.1103/PhysRevLett.102.127004

@article{bd5353609ab3463eae8dfbd45e29766e,

title = "Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors",

abstract = "The London penetration depth λ(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of λ(T) follows a power law, Δλ(T)∼Tn with n/2.4±0.1, indicating the existence of normal quasiparticles down to at least 0.02Tc. This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.",

author = "Gordon, {R. T.} and N. Ni and C. Martin and Tanatar, {M. A.} and Vannette, {M. D.} and H. Kim and Samolyuk, {G. D.} and J. Schmalian and S. Nandi and A. Kreyssig and Goldman, {A. I.} and Yan, {J. Q.} and Bud'Ko, {S. L.} and Canfield, {P. C.} and R. Prozorov",

year = "2009",

month = mar,

day = "23",

doi = "10.1103/PhysRevLett.102.127004",

language = "English",

volume = "102",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

}

Gordon, RT, Ni, N, Martin, C, Tanatar, MA, Vannette, MD, Kim, H, Samolyuk, GD, Schmalian, J, Nandi, S, Kreyssig, A, Goldman, AI, Yan, JQ, Bud'Ko, SL, Canfield, PC & Prozorov, R 2009, 'Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors', Physical Review Letters, vol. 102, no. 12, 127004. https://doi.org/10.1103/PhysRevLett.102.127004

TY - JOUR

T1 - Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors

AU - Gordon, R. T.

AU - Ni, N.

AU - Martin, C.

AU - Tanatar, M. A.

AU - Vannette, M. D.

AU - Kim, H.

AU - Samolyuk, G. D.

AU - Schmalian, J.

AU - Nandi, S.

AU - Kreyssig, A.

AU - Goldman, A. I.

AU - Yan, J. Q.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Prozorov, R.

PY - 2009/3/23

Y1 - 2009/3/23

N2 - The London penetration depth λ(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of λ(T) follows a power law, Δλ(T)∼Tn with n/2.4±0.1, indicating the existence of normal quasiparticles down to at least 0.02Tc. This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.

AB - The London penetration depth λ(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of λ(T) follows a power law, Δλ(T)∼Tn with n/2.4±0.1, indicating the existence of normal quasiparticles down to at least 0.02Tc. This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.

UR - http://www.scopus.com/inward/record.url?scp=64049095043&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.102.127004

DO - 10.1103/PhysRevLett.102.127004

M3 - Article

AN - SCOPUS:64049095043

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 127004

ER -

Unconventional london penetration depth in single-crystal Ba(Fe0.93Co0.07)2As2 superconductors

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