Balancing act: Evidence for a strong subdominant d-wave pairing channel in Ba0.6K0.4Fe2As2

Böhm, T.; Kemper, A. F.; Moritz, B.; Kretzschmar, F.; Muschler, B.; Eiter, H. -M.; Hackl, R.; Devereaux, T. P.; Scalapino, D. J.; Wen, Hai -Hu

doi:10.1103/PhysRevX.4.041046

Title: Balancing act: Evidence for a strong subdominant $d$ -wave pairing channel in ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$

Journal Article · Thu Dec 18 00:00:00 EST 2014 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.4.041046· OSTI ID:1215434

Böhm, T. ^[1]; Kemper, A. F. ^[2]; Moritz, B. ^[3]; Kretzschmar, F. ^[4]; Muschler, B. ^[5]; Eiter, H. -M. ^[4]; Hackl, R. ^[6]; Devereaux, T. P. ^[7]; Scalapino, D. J. ^[8]; Wen, Hai -Hu ^[9]

Bayerishe Akademie der Wissenshaften (Germany); Technishe Univ. München (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Bayerishe Akademie der Wissenshaften (Germany); Technishe Univ., München (Germany)
Bayerishe Akademie der Wissenshaften (Germany); Technishe Univ. München (Germany)
Bayerishe Akademie der Wissenshaften (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials.
Univ. of California, Santa Barbara, CA (United States)
Nanjing Univ. (China). National Lab. of Solid State Microstructures.

We present detailed measurements of the temperature-dependent Raman spectra of optimally doped Ba_0.6K_0.4Fe₂As₂ and analyze the low-temperature spectra based on local-density-approximation band-structure calculations and the subsequent estimation of effective Raman vertices. Experimentally, a narrow, emergent mode appears in the B_1g (d_x²-y²) Raman spectra only below T_c, well into the superconducting state and at an energy below twice the energy gap on the electron Fermi-surface sheets. The Raman spectra can be reproduced quantitatively with estimates for the magnitude and momentum-space structure of an A_1g (s-wave) pairing gap on different Fermi-surface sheets, as well as the identification of the emergent sharp feature as a Bardasis-Schrieffer exciton. Formed as a Cooper-pair bound state in a subdominant d_x²-y² channel, the binding energy of the exciton relative to the gap edge shows that the coupling strength in the subdominant channel is as strong as 60% of that in the dominant s-wave channel. This result suggests that d_x²-y² may be the dominant pairing symmetry in Fe-based superconductors that lack central hole bands.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: HA 2071/7; A5; AC02-76SF00515

OSTI ID:: 1215434

Journal Information:: Physical Review. X, Vol. 4, Issue 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Title: Balancing act: Evidence for a strong subdominant $d$ -wave pairing channel in ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$