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Title: Indication of subdominant d-wave interaction in superconducting CaKFe4 As4

Abstract

We report inelastic light scattering results on the stoichiometric and fully ordered superconductor CaKFe4 As4 as a function of temperature and light polarization. In the energy range between 10 and 315 cm-1 (1.24 and 39.1 meV) we observe the particle-hole continuum above and below the superconducting transition temperature Tc and seven of the eight Raman active phonons. The main focus is placed on the analysis of the electronic excitations. Below Tc all three symmetries projected with in-plane polarizations display a redistribution of spectral weight characteristic for superconductivity. The energies of the pair-breaking peaks in A1g and B2g symmetry are in approximate agreement with the results from photoemission studies. In B1g symmetry the difference between the normal and superconducting state is most pronounced, and the feature is shifted downwards with respect to those in A1g and B2g symmetry. The maximum peaking at 134 cm-1 (16.6 meV) has a substructure on the high-energy side. We interpret the peak at 134 cm-1 in terms of a collective Bardasis-Schrieffer (BS) mode and the substructure as a remainder of the pair-breaking feature on the electron bands. Finally, there is a very weak peak at 50 cm-1 (6.2 meV) which is tentatively assigned to another BSmore » mode.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Bayerische Akademie der Wissenschaften, Garching (Germany). Walther Meissner Inst.; Technical University of Munich, Garching (Germany). Fakultät für Physik E23
  2. Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  3. Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
  4. Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  5. Univ. of Belgrade, Belgrade (Serbia). Center for Solid State Physics and New Materials, Inst. of Physics Belgrade
  6. Bavarian Academy of Sciences and Humanities, Garching (Germany). Walther Meissner Inst.
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; German Academic Exchange Service (DAAD); Serbian Ministry of Education, Science and Technological Development; Gordon and Betty Moore Foundation (GBMF); USDOE
OSTI Identifier:
1464473
Alternate Identifier(s):
OSTI ID: 1460127
Report Number(s):
IS-J-9711
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1902388
Grant/Contract Number:  
56267076; 57142964; AC02-07CH11358; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Jost, D., Scholz, J. -R., Zweck, U., Meier, W. R., Böhmer, A.  E., Canfield, P. C., Lazarević, N., and Hackl, R. Indication of subdominant d-wave interaction in superconducting CaKFe4 As4. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.020504.
Jost, D., Scholz, J. -R., Zweck, U., Meier, W. R., Böhmer, A.  E., Canfield, P. C., Lazarević, N., & Hackl, R. Indication of subdominant d-wave interaction in superconducting CaKFe4 As4. United States. doi:10.1103/PhysRevB.98.020504.
Jost, D., Scholz, J. -R., Zweck, U., Meier, W. R., Böhmer, A.  E., Canfield, P. C., Lazarević, N., and Hackl, R. Sun . "Indication of subdominant d-wave interaction in superconducting CaKFe4 As4". United States. doi:10.1103/PhysRevB.98.020504. https://www.osti.gov/servlets/purl/1464473.
@article{osti_1464473,
title = {Indication of subdominant d-wave interaction in superconducting CaKFe4 As4},
author = {Jost, D. and Scholz, J. -R. and Zweck, U. and Meier, W. R. and Böhmer, A.  E. and Canfield, P. C. and Lazarević, N. and Hackl, R.},
abstractNote = {We report inelastic light scattering results on the stoichiometric and fully ordered superconductor CaKFe4 As4 as a function of temperature and light polarization. In the energy range between 10 and 315 cm-1 (1.24 and 39.1 meV) we observe the particle-hole continuum above and below the superconducting transition temperature Tc and seven of the eight Raman active phonons. The main focus is placed on the analysis of the electronic excitations. Below Tc all three symmetries projected with in-plane polarizations display a redistribution of spectral weight characteristic for superconductivity. The energies of the pair-breaking peaks in A1g and B2g symmetry are in approximate agreement with the results from photoemission studies. In B1g symmetry the difference between the normal and superconducting state is most pronounced, and the feature is shifted downwards with respect to those in A1g and B2g symmetry. The maximum peaking at 134 cm-1 (16.6 meV) has a substructure on the high-energy side. We interpret the peak at 134 cm-1 in terms of a collective Bardasis-Schrieffer (BS) mode and the substructure as a remainder of the pair-breaking feature on the electron bands. Finally, there is a very weak peak at 50 cm-1 (6.2 meV) which is tentatively assigned to another BS mode.},
doi = {10.1103/PhysRevB.98.020504},
journal = {Physical Review B},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}

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Figures / Tables:

Figure 1 Figure 1: Structure and Fermi surface of CaKFe4As4. (a) Tetragonal unit cell with the Ca, K, Fe, and As atoms shown in blue, gold, red, and respectively, green. (b) Quasi 2D Fe2As2 layer with the full orange line depicting the 1 Fe unit cell. (c) Brillouin zone of the 1more » Fe cell. The three hole bands labeled α, β, and γ (blue) encircle the Γ point. The electron bands δ1 and δ2 (red) are centered at the X and Y point, respectively [adopted from Mou et al.].« less

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Works referenced in this record:

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Enhancement of the Superconducting Gap by Nesting in CaKFe 4 As 4 : A New High Temperature Superconductor
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    Works referencing / citing this record:

    High- T c superconductivity in CaKFe 4 As 4 in absence of nematic fluctuations
    journal, October 2018


    Cavity superconductor-polaritons
    journal, January 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.