Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe0.92Co0.08)2 As2

Manan Mehta; Goutam Sheet; D. A. Dikin; S. Lee; C. W. Bark; J. Jiang; J. D. Weiss; E. E. Hellstrom; M. S. Rzchowski; C. B. Eom; V. Chandrasekhar

doi:10.1063/1.3460274

Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe_0.92Co_0.08)2 As₂

Manan Mehta^*, Goutam Sheet, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, M. S. Rzchowski, C. B. Eom, V. Chandrasekhar

^*Corresponding author for this work

Physics and Astronomy

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7 Scopus citations

Abstract

One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba (Fe_0.92 Co_0.08)2 As₂ shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature T_c. We associate this observation with the existence of a gap above T_c that might originate from strong fluctuations of the phase of the superconducting order parameter.

Original language	English (US)
Article number	012503
Journal	Applied Physics Letters
Volume	97
Issue number	1
DOIs	https://doi.org/10.1063/1.3460274
State	Published - Jul 5 2010

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3460274

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@article{15d04bbfe40c4b5f8ec3ec4c629f8a96,

title = "Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe0.92Co0.08)2 As2",

abstract = "One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba (Fe0.92 Co0.08)2 As2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature Tc. We associate this observation with the existence of a gap above Tc that might originate from strong fluctuations of the phase of the superconducting order parameter.",

author = "Manan Mehta and Goutam Sheet and Dikin, {D. A.} and S. Lee and Bark, {C. W.} and J. Jiang and Weiss, {J. D.} and Hellstrom, {E. E.} and Rzchowski, {M. S.} and Eom, {C. B.} and V. Chandrasekhar",

note = "Funding Information: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences through Grant Nos. DE-FG02-06ER46346 at Northwestern University and through DE-FG02-06ER46327 at University of Wisconsin–Madison. The work at the NHMFL was supported under NSF Cooperative Agreement No. DMR-0084173, by the State of Florida and by AFOSR under Grant No. FA9550-06-1-0474.",

year = "2010",

month = jul,

day = "5",

doi = "10.1063/1.3460274",

language = "English (US)",

volume = "97",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "1",

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Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe_0.92Co_0.08)2 As₂. / Mehta, Manan; Sheet, Goutam; Dikin, D. A.; Lee, S.; Bark, C. W.; Jiang, J.; Weiss, J. D.; Hellstrom, E. E.; Rzchowski, M. S.; Eom, C. B.; Chandrasekhar, V.

In: Applied Physics Letters, Vol. 97, No. 1, 012503, 05.07.2010.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe0.92Co0.08)2 As2

AU - Mehta, Manan

AU - Sheet, Goutam

AU - Dikin, D. A.

AU - Lee, S.

AU - Bark, C. W.

AU - Jiang, J.

AU - Weiss, J. D.

AU - Hellstrom, E. E.

AU - Rzchowski, M. S.

AU - Eom, C. B.

AU - Chandrasekhar, V.

N1 - Funding Information: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences through Grant Nos. DE-FG02-06ER46346 at Northwestern University and through DE-FG02-06ER46327 at University of Wisconsin–Madison. The work at the NHMFL was supported under NSF Cooperative Agreement No. DMR-0084173, by the State of Florida and by AFOSR under Grant No. FA9550-06-1-0474.

PY - 2010/7/5

Y1 - 2010/7/5

N2 - One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba (Fe0.92 Co0.08)2 As2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature Tc. We associate this observation with the existence of a gap above Tc that might originate from strong fluctuations of the phase of the superconducting order parameter.

AB - One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba (Fe0.92 Co0.08)2 As2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature Tc. We associate this observation with the existence of a gap above Tc that might originate from strong fluctuations of the phase of the superconducting order parameter.

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Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe_0.92Co_0.08)2 As₂

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