Microscopic origin of Cooper pairing in the iron-based superconductor Ba1−xKxFe2As2

Thomas Böhm; Florian Kretzschmar; Andreas Baum; Michael Rehm; Daniel Jost; Ramez Hosseinian Ahangharnejhad; Ronny Thomale; Christian Platt; Thomas A. Maier; Werner Hanke; Brian Moritz; Thomas P. Devereaux; Douglas J. Scalapino; Saurabh Maiti; Peter J. Hirschfeld; Peter Adelmann; Thomas Wolf; Hai Hu Wen; Rudi Hackl

doi:10.1038/s41535-018-0118-z

Microscopic origin of Cooper pairing in the iron-based superconductor Ba_1−xK_xFe₂As₂

Thomas Böhm, Florian Kretzschmar, Andreas Baum, Michael Rehm, Daniel Jost, Ramez Hosseinian Ahangharnejhad, Ronny Thomale, Christian Platt, Thomas A. Maier, Werner Hanke, Brian Moritz, Thomas P. Devereaux, Douglas J. Scalapino, Saurabh Maiti, Peter J. Hirschfeld, Peter Adelmann, Thomas Wolf, Hai Hu Wen, Rudi Hackl

Computational Sciences & Engineering Div

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

19 Scopus citations

Abstract

Resolving the microscopic pairing mechanism and its experimental identification in unconventional superconductors is among the most vexing problems of contemporary condensed matter physics. We show that Raman spectroscopy provides an avenue towards this aim by probing the structure of the pairing interaction at play in an unconventional superconductor. As we study the spectra of the prototypical Fe-based superconductor Ba_1−xK_xFe₂As₂for 0.22 ≤ x ≤ 0.70 in all symmetry channels, Raman spectroscopy allows us to distill the leading s-wave state. In addition, the spectra collected in the B_1gsymmetry channel reveal the existence of two collective modes which are indicative of the presence of two competing, yet sub-dominant, pairing tendencies of dx2-y2 symmetry type. A comprehensive functional Renormalization Group and random-phase approximation study on this compound confirms the presence of the two sub-leading channels, and consistently matches the experimental doping dependence of the related modes. The consistency between the experimental observations and the theoretical modeling suggests that spin fluctuations play a significant role in superconducting pairing.

Original language	English
Article number	48
Journal	npj Quantum Materials
Volume	3
Issue number	1
DOIs	https://doi.org/10.1038/s41535-018-0118-z
State	Published - Dec 1 2018

Funding

We acknowledge useful discussions with L. Benfatto, A. Eberlein, D. Einzel, S. A. Kivelson, C. Meingast, and I. Tüttő. W.H. gratefully acknowledges the hospitality of the Institute for Theoretical Physics at the University of California Santa Barbara. Financial support for the work came from the Deutsche Forschungsgemeinschaft (DFG) via the Priority Program SPP 1458 (T.B., A.B., R.H., C.P. and W.H., project nos. HA 2071/7-2 and HA 1537/24-2), the Collaborative Research Centers SFB 1170 (W.H., C.P., and R.T.), and TRR 80 (F.K. and R.H.), the Bavaria California Technology Center BaCaTeC (T.B. and R. H., project no. A5 [2012-2]), the European Research Council (ERC) through ERC-StG-Thomale-TOPOLECTRICS (R.T.), and from the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract Nos. DE-AC02-76SF00515 (B.M. and T.P.D.) and DE-FG02-05ER46236 (P.J.H. and S.M.). The RPA calculations were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The work in China (H.-H.W.) was supported by the National Key Research and Development Program of China (2016YFA0300401), and the National Natural Science Foundation of China (NSFC) via projects A0402/11534005 and A0402/11374144.

Funders	Funder number
ERC-StG-Thomale-TOPOLECTRICS
Office of Basic Energy Sciences
U.S. Department of Energy
Basic Energy Sciences	DEAC02-76SF00515
Division of Materials Sciences and Engineering
European Research Council
Deutsche Forschungsgemeinschaft	2012-2
National Natural Science Foundation of China	A0402/11534005, A0402/11374144
Friedrich-Ebert-Stiftung	DJ-1738642
National Basic Research Program of China (973 Program)	2016YFA0300401

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Böhm, T., Kretzschmar, F., Baum, A., Rehm, M., Jost, D., Hosseinian Ahangharnejhad, R., Thomale, R., Platt, C., Maier, T. A., Hanke, W., Moritz, B., Devereaux, T. P., Scalapino, D. J., Maiti, S., Hirschfeld, P. J., Adelmann, P., Wolf, T., Wen, H. H., & Hackl, R. (2018). Microscopic origin of Cooper pairing in the iron-based superconductor Ba_1−xK_xFe₂As₂ npj Quantum Materials, 3(1), Article 48. https://doi.org/10.1038/s41535-018-0118-z

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title = "Microscopic origin of Cooper pairing in the iron-based superconductor Ba1−xKxFe2As2 ",

abstract = "Resolving the microscopic pairing mechanism and its experimental identification in unconventional superconductors is among the most vexing problems of contemporary condensed matter physics. We show that Raman spectroscopy provides an avenue towards this aim by probing the structure of the pairing interaction at play in an unconventional superconductor. As we study the spectra of the prototypical Fe-based superconductor Ba1−xKxFe2As2for 0.22 ≤ x ≤ 0.70 in all symmetry channels, Raman spectroscopy allows us to distill the leading s-wave state. In addition, the spectra collected in the B1gsymmetry channel reveal the existence of two collective modes which are indicative of the presence of two competing, yet sub-dominant, pairing tendencies of dx2-y2 symmetry type. A comprehensive functional Renormalization Group and random-phase approximation study on this compound confirms the presence of the two sub-leading channels, and consistently matches the experimental doping dependence of the related modes. The consistency between the experimental observations and the theoretical modeling suggests that spin fluctuations play a significant role in superconducting pairing.",

author = "Thomas B{\"o}hm and Florian Kretzschmar and Andreas Baum and Michael Rehm and Daniel Jost and {Hosseinian Ahangharnejhad}, Ramez and Ronny Thomale and Christian Platt and Maier, {Thomas A.} and Werner Hanke and Brian Moritz and Devereaux, {Thomas P.} and Scalapino, {Douglas J.} and Saurabh Maiti and Hirschfeld, {Peter J.} and Peter Adelmann and Thomas Wolf and Wen, {Hai Hu} and Rudi Hackl",

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doi = "10.1038/s41535-018-0118-z",

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Böhm, T, Kretzschmar, F, Baum, A, Rehm, M, Jost, D, Hosseinian Ahangharnejhad, R, Thomale, R, Platt, C, Maier, TA, Hanke, W, Moritz, B, Devereaux, TP, Scalapino, DJ, Maiti, S, Hirschfeld, PJ, Adelmann, P, Wolf, T, Wen, HH & Hackl, R 2018, 'Microscopic origin of Cooper pairing in the iron-based superconductor Ba_1−xK_xFe₂As₂ ', npj Quantum Materials, vol. 3, no. 1, 48. https://doi.org/10.1038/s41535-018-0118-z

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AU - Kretzschmar, Florian

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AU - Jost, Daniel

AU - Hosseinian Ahangharnejhad, Ramez

AU - Thomale, Ronny

AU - Platt, Christian

AU - Maier, Thomas A.

AU - Hanke, Werner

AU - Moritz, Brian

AU - Devereaux, Thomas P.

AU - Scalapino, Douglas J.

AU - Maiti, Saurabh

AU - Hirschfeld, Peter J.

AU - Adelmann, Peter

AU - Wolf, Thomas

AU - Wen, Hai Hu

AU - Hackl, Rudi

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N2 - Resolving the microscopic pairing mechanism and its experimental identification in unconventional superconductors is among the most vexing problems of contemporary condensed matter physics. We show that Raman spectroscopy provides an avenue towards this aim by probing the structure of the pairing interaction at play in an unconventional superconductor. As we study the spectra of the prototypical Fe-based superconductor Ba1−xKxFe2As2for 0.22 ≤ x ≤ 0.70 in all symmetry channels, Raman spectroscopy allows us to distill the leading s-wave state. In addition, the spectra collected in the B1gsymmetry channel reveal the existence of two collective modes which are indicative of the presence of two competing, yet sub-dominant, pairing tendencies of dx2-y2 symmetry type. A comprehensive functional Renormalization Group and random-phase approximation study on this compound confirms the presence of the two sub-leading channels, and consistently matches the experimental doping dependence of the related modes. The consistency between the experimental observations and the theoretical modeling suggests that spin fluctuations play a significant role in superconducting pairing.

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Microscopic origin of Cooper pairing in the iron-based superconductor Ba_1−xK_xFe₂As₂

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