Impact of Iron-site defects on Superconductivity in LiFeAs

Shun Chi; Rama Krishna Prasad Aluru; Udai Raj Singh; Ruixing Liang; Walter N Hardy; D.A. Bonn; A Kreisel; Brian M. Andersen; R. Nelson; T. Berlijn; W. Ku; P.J. Hirschfeld; Peter Wahl

doi:10.1103/PhysRevB.94.134515

Impact of Iron-site defects on Superconductivity in LiFeAs

Shun Chi, Rama Krishna Prasad Aluru, Udai Raj Singh, Ruixing Liang, Walter N Hardy, D.A. Bonn, A Kreisel, Brian M. Andersen, R. Nelson, T. Berlijn, W. Ku, P.J. Hirschfeld, Peter Wahl

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

Abstract

In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s order parameter they can occur for both magnetic and non-magnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter.
Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. Detailed comparison of tunneling spectra measured on impurities with spin fluctuation theory reveals a continuous evolution from negligible impurity bound state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multi-orbital physics.

Original language	English
Article number	134515
Journal	Physical Review. B, Condensed matter and materials physics
Volume	94
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.94.134515
Publication status	Published - 19 Oct 2016

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Chi_2016_lifeas_PhysRevB_AAM
© 2016, American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org / https://doi.org/10.1103/PhysRevB.94.134515
Accepted author manuscript, 611 KB

Challening the Limits of Photonics: stru: Challenging the Limits of Photonics: Structured Light
Dholakia, K. (PI), Krauss, T. F. (CoI) & Samuel, I. D. W. (CoI)
EPSRC
1/06/12 → 31/05/17
Project: Standard
Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Data underpinning - Impact of Iron-site defects on Superconductivity in LiFeAs
Chi, S. (Creator), Aluru, R. K. P. (Creator), Singh, U. R. (Creator), Liang, R. (Creator), Hardy, W. N. (Creator), Bonn, D. A. (Creator), Kreisel, A. (Creator), Andersen, B. M. (Creator), Nelson, R. (Creator), Berlijn, T. (Creator), Ku, W. (Creator), Hirschfeld, P. J. (Creator) & Wahl, P. (Creator), University of St Andrews, 3 Mar 2017
DOI: 10.17630/64f6517a-02e0-407f-8954-cc8f81d4014a
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Cite this

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title = "Impact of Iron-site defects on Superconductivity in LiFeAs",

abstract = "In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s order parameter they can occur for both magnetic and non-magnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter.Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. Detailed comparison of tunneling spectra measured on impurities with spin fluctuation theory reveals a continuous evolution from negligible impurity bound state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multi-orbital physics.",

author = "Shun Chi and Aluru, {Rama Krishna Prasad} and Singh, {Udai Raj} and Ruixing Liang and Hardy, {Walter N} and D.A. Bonn and A Kreisel and Andersen, {Brian M.} and R. Nelson and T. Berlijn and W. Ku and P.J. Hirschfeld and Peter Wahl",

note = "PW acknowledges funding from the MPG-UBC center and financial support from EPSRC (EP/I031014/1).",

year = "2016",

month = oct,

day = "19",

doi = "10.1103/PhysRevB.94.134515",

language = "English",

volume = "94",

journal = "Physical Review. B, Condensed matter and materials physics",

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publisher = "American Physical Society",

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TY - JOUR

T1 - Impact of Iron-site defects on Superconductivity in LiFeAs

AU - Chi, Shun

AU - Aluru, Rama Krishna Prasad

AU - Singh, Udai Raj

AU - Liang, Ruixing

AU - Hardy, Walter N

AU - Bonn, D.A.

AU - Kreisel, A

AU - Andersen, Brian M.

AU - Nelson, R.

AU - Berlijn, T.

AU - Ku, W.

AU - Hirschfeld, P.J.

AU - Wahl, Peter

N1 - PW acknowledges funding from the MPG-UBC center and financial support from EPSRC (EP/I031014/1).

PY - 2016/10/19

Y1 - 2016/10/19

N2 - In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s order parameter they can occur for both magnetic and non-magnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter.Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. Detailed comparison of tunneling spectra measured on impurities with spin fluctuation theory reveals a continuous evolution from negligible impurity bound state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multi-orbital physics.

AB - In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s order parameter they can occur for both magnetic and non-magnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter.Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. Detailed comparison of tunneling spectra measured on impurities with spin fluctuation theory reveals a continuous evolution from negligible impurity bound state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multi-orbital physics.

U2 - 10.1103/PhysRevB.94.134515

DO - 10.1103/PhysRevB.94.134515

M3 - Article

SN - 1098-0121

VL - 94

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

IS - 13

M1 - 134515

ER -

Impact of Iron-site defects on Superconductivity in LiFeAs

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Challening the Limits of Photonics: stru: Challenging the Limits of Photonics: Structured Light

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Data underpinning - Impact of Iron-site defects on Superconductivity in LiFeAs

Cite this