Indication of subdominant d-wave interaction in superconducting CaKFe4 As4

Jost, D.; Scholz, J. -R.; Zweck, U.; Meier, W. R.; Böhmer, A.  E.; Canfield, P. C.; Lazarević, N.; Hackl, R.

doi:10.1103/PhysRevB.98.020504

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 T_c and seven of the eight Raman active phonons. The main focus is placed on the analysis of the electronic excitations. Below T_c 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 A_1g and B_2g symmetry are in approximate agreement with the results from photoemission studies. In B_1g symmetry the difference between the normal and superconducting state is most pronounced, and the feature is shifted downwards with respect to those in A_1g and B_2g 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:

Jost, D. ^[1]; Scholz, J. -R. ^[1]; Zweck, U. ^[1]; Meier, W. R. ^[2]; Böhmer, A. E. ^[3]; Canfield, P. C. ^[4]; Lazarević, N. ^[5]; Hackl, R. ^[6]

Bayerische Akademie der Wissenschaften, Garching (Germany). Walther Meissner Inst.; Technical University of Munich, Garching (Germany). Fakultät für Physik E23
Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Univ. of Belgrade, Belgrade (Serbia). Center for Solid State Physics and New Materials, Inst. of Physics Belgrade
Bavarian Academy of Sciences and Humanities, Garching (Germany). Walther Meissner Inst.

Publication Date:: Sun Jul 01 00:00:00 EDT 2018

Research Org.:: Ames Laboratory (AMES), 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.

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                    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.  https://doi.org/10.1103/PhysRevB.98.020504

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                    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.  https://doi.org/10.1103/PhysRevB.98.020504.  https://www.osti.gov/servlets/purl/1464473.

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@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         = {Sun Jul 01 00:00:00 EDT 2018},

  month        = {Sun Jul 01 00:00:00 EDT 2018}

}

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https://doi.org/10.1103/PhysRevB.98.020504

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Cited by: 11 works

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Figures / Tables:

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 »

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Works referenced in this record:

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journal, December 2016

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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

Zhang, W. -L.; Meier, W. R.; Kong, T.
Physical Review B, Vol. 98, Issue 14
DOI: 10.1103/physrevb.98.140501

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

Abstract

Citation Formats

Figures / Tables:

Anisotropic thermodynamic and transport properties of single-crystalline CaKFe 4 As 4 journal, August 2016

Signature of the Leggett mode in the A 1 g Raman response: From MgB 2 to iron-based superconductors journal, August 2016

Superconductivity at 38 K in the Iron Arsenide ( Ba 1 − x K x ) Fe 2 As 2 journal, September 2008

Excitons and Plasmons in Superconductors journal, February 1961

Collective d -wave exciton modes in the calculated Raman spectrum of Fe-based superconductors journal, October 2009

Critical quadrupole fluctuations and collective modes in iron pnictide superconductors journal, February 2016

Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 − x F x journal, July 2008

Optimization of the crystal growth of the superconductor CaKFe 4 As 4 from solution in the FeAs − CaFe 2 As 2 − KFe 2 As 2 system journal, June 2017

Balancing Act: Evidence for a Strong Subdominant d -Wave Pairing Channel in Ba 0.6 K 0.4 Fe 2 As 2 journal, December 2014

Inelastic light scattering from correlated electrons journal, January 2007

Observation of Incipient Charge Nematicity in Ba ( Fe 1 − X Co X ) 2 As 2 journal, December 2013

New-Structure-Type Fe-Based Superconductors: Ca A Fe 4 As 4 ( A = K, Rb, Cs) and Sr A Fe 4 As 4 ( A = Rb, Cs) journal, March 2016

Raman-Scattering Detection of Nearly Degenerate s -Wave and d -Wave Pairing Channels in Iron-Based Ba 0.6 K 0.4 Fe 2 As 2 and Rb 0.8 Fe 1.6 Se 2 Superconductors journal, May 2013

Charge-induced nematicity in FeSe journal, August 2016

Signature of multigap nodeless superconductivity in CaKFe 4 As 4 journal, April 2017

Theory of Raman scattering with final-state interaction in high- T c BCS superconductors: Collective modes journal, May 1990

Critical spin fluctuations and the origin of nematic order in Ba(Fe1−xCox)2As2 journal, January 2016

Using gap symmetry and structure to reveal the pairing mechanism in Fe-based superconductors journal, January 2016

Enhancement of the Superconducting Gap by Nesting in CaKFe 4 As 4 : A New High Temperature Superconductor journal, December 2016

Anomalous phonon behavior in superconducting CaKFe 4 As 4 : An optical study journal, February 2017

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

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

Anisotropic thermodynamic and transport properties of single-crystalline ${CaKFe}_{4} {As}_{4}$
journal, August 2016

Signature of the Leggett mode in the $A_{1 g}$ Raman response: From ${MgB}_{2}$ to iron-based superconductors
journal, August 2016

Superconductivity at 38 K in the Iron Arsenide $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$
journal, September 2008

Excitons and Plasmons in Superconductors
journal, February 1961

Collective $d$ -wave exciton modes in the calculated Raman spectrum of Fe-based superconductors
journal, October 2009

Critical quadrupole fluctuations and collective modes in iron pnictide superconductors
journal, February 2016

Unconventional Superconductivity with a Sign Reversal in the Order Parameter of ${LaFeAsO}_{1 - x} F_{x}$
journal, July 2008

Optimization of the crystal growth of the superconductor ${CaKFe}_{4} {As}_{4}$ from solution in the $FeAs − {CaFe}_{2} {As}_{2} − {KFe}_{2} {As}_{2}$ system
journal, June 2017

Balancing Act: Evidence for a Strong Subdominant $d$ -Wave Pairing Channel in ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$
journal, December 2014

Inelastic light scattering from correlated electrons
journal, January 2007

Observation of Incipient Charge Nematicity in ${Ba (Fe_{1 - X} Co_{X})}_{2} As_{2}$
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New-Structure-Type Fe-Based Superconductors: Ca A Fe ₄ As ₄ ( A = K, Rb, Cs) and Sr A Fe ₄ As ₄ ( A = Rb, Cs)
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Raman-Scattering Detection of Nearly Degenerate $s$ -Wave and $d$ -Wave Pairing Channels in Iron-Based ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$ and ${Rb}_{0.8} {Fe}_{1.6} {Se}_{2}$ Superconductors
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