Phase-incoherent superconducting pairs in the normal state of Ba(Fe1-xCox)2As2

Goutam Sheet; Manan Mehta; 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:10.1103/PhysRevLett.105.167003

Phase-incoherent superconducting pairs in the normal state of Ba(Fe1-xCox)2As2

Goutam Sheet^*, Manan Mehta, 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

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

21 Scopus citations

Abstract

The normal state properties of the recently discovered ferropnictide superconductors might hold the key to understanding their exotic superconductivity. Using point-contact spectroscopy we show that Andreev reflection between an epitaxial thin film of Ba(Fe0.92Co0.08)2As2 and a silver tip can be seen in the normal state of the film up to temperature T∼1.3Tc, where Tc is the critical temperature of the superconductor. Andreev reflection far above Tc can be understood only when superconducting pairs arising from strong fluctuation of the phase of the complex superconducting order parameter exist in the normal state. Our results provide spectroscopic evidence of phase-incoherent superconducting pairs in the normal state of the ferropnictide superconductors.

Original language	English (US)
Article number	167003
Journal	Physical review letters
Volume	105
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.105.167003
State	Published - Oct 11 2010

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1103/PhysRevLett.105.167003

Cite this

@article{c3332bdf85334e5a863dab811e4c60c2,

title = "Phase-incoherent superconducting pairs in the normal state of Ba(Fe1-xCox)2As2",

abstract = "The normal state properties of the recently discovered ferropnictide superconductors might hold the key to understanding their exotic superconductivity. Using point-contact spectroscopy we show that Andreev reflection between an epitaxial thin film of Ba(Fe0.92Co0.08)2As2 and a silver tip can be seen in the normal state of the film up to temperature T∼1.3Tc, where Tc is the critical temperature of the superconductor. Andreev reflection far above Tc can be understood only when superconducting pairs arising from strong fluctuation of the phase of the complex superconducting order parameter exist in the normal state. Our results provide spectroscopic evidence of phase-incoherent superconducting pairs in the normal state of the ferropnictide superconductors.",

author = "Goutam Sheet and Manan Mehta 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",

year = "2010",

month = oct,

day = "11",

doi = "10.1103/PhysRevLett.105.167003",

language = "English (US)",

volume = "105",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "16",

}

TY - JOUR

T1 - Phase-incoherent superconducting pairs in the normal state of Ba(Fe1-xCox)2As2

AU - Sheet, Goutam

AU - Mehta, Manan

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.

PY - 2010/10/11

Y1 - 2010/10/11

N2 - The normal state properties of the recently discovered ferropnictide superconductors might hold the key to understanding their exotic superconductivity. Using point-contact spectroscopy we show that Andreev reflection between an epitaxial thin film of Ba(Fe0.92Co0.08)2As2 and a silver tip can be seen in the normal state of the film up to temperature T∼1.3Tc, where Tc is the critical temperature of the superconductor. Andreev reflection far above Tc can be understood only when superconducting pairs arising from strong fluctuation of the phase of the complex superconducting order parameter exist in the normal state. Our results provide spectroscopic evidence of phase-incoherent superconducting pairs in the normal state of the ferropnictide superconductors.

AB - The normal state properties of the recently discovered ferropnictide superconductors might hold the key to understanding their exotic superconductivity. Using point-contact spectroscopy we show that Andreev reflection between an epitaxial thin film of Ba(Fe0.92Co0.08)2As2 and a silver tip can be seen in the normal state of the film up to temperature T∼1.3Tc, where Tc is the critical temperature of the superconductor. Andreev reflection far above Tc can be understood only when superconducting pairs arising from strong fluctuation of the phase of the complex superconducting order parameter exist in the normal state. Our results provide spectroscopic evidence of phase-incoherent superconducting pairs in the normal state of the ferropnictide superconductors.

UR - http://www.scopus.com/inward/record.url?scp=77957913290&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77957913290&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.105.167003

DO - 10.1103/PhysRevLett.105.167003

M3 - Article

C2 - 21230998

AN - SCOPUS:77957913290

SN - 0031-9007

VL - 105

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 167003

ER -

Phase-incoherent superconducting pairs in the normal state of Ba(Fe1-xCox)2As2

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this