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

Physical Review X

Volumn 4, Issue 4, 2014, Pages

  Bohm T ^a,b,c   Kemper, A F ^d   Moritz, B ^c   Kretzschmar, F ^a,b   Muschler, B ^a,b,h   Eiter, H M ^a,b   Hackl, R ^a   Devereaux, T P ^c,e   Scalapino, D J ^f   Wen, Hai Hu ^g  

^a WALTHER MEISSNER INSTITUT   (Germany)

^b TECHNICAL UNIVERSITY OF MUNICH   (Germany)

^c SLAC NATIONAL ACCELERATOR LABORATORY   (United States)

^d LAWRENCE BERKELEY NATIONAL LABORATORY   (United States)

^e STANFORD UNIVERSITY   (United States)

^f UNIVERSITY OF CALIFORNIA   (United States)

^g NANJING UNIVERSITY   (China)

^h Zoller and Fröhlich GmbH   (Germany)

Author keywords

Condensed matter physics; Superconductivity

Indexed keywords

ARSENIC COMPOUNDS; BARIUM COMPOUNDS; BINDING ENERGY; CONDENSED MATTER PHYSICS; DOPING (ADDITIVES); EXCITONS; FERMI SURFACE; IRON COMPOUNDS; IRON-BASED SUPERCONDUCTORS; LOCAL DENSITY APPROXIMATION; RAMAN SCATTERING; SHEAR WAVES; SUPERCONDUCTIVITY; TEMPERATURE;

BAND STRUCTURE CALCULATION; COUPLING STRENGTHS; LOW TEMPERATURES; MEASUREMENTS OF; MOMENTUM SPACES; PAIRING SYMMETRIES; SUPERCONDUCTING STATE; TEMPERATURE-DEPENDENT RAMAN;

POTASSIUM COMPOUNDS;

EID: 84921467733     PISSN: None     EISSN: 21603308     Source Type: Journal    
DOI: 10.1103/PhysRevX.4.041046     Document Type: Article

References (70)

1. x, Phys. Rev. Lett. 101, 057003 (2008).
2. R. M. Fernandes and A. J. Millis, Suppression of Superconductivity by Néel-Type Magnetic Fluctuations in the Iron Pnictides, Phys. Rev. Lett. 110, 117004 (2013).
3. S. Liang, A. Moreo, and E. Dagotto, Nematic State of Pnictides Stabilized by Interplay between Spin, Orbital, and Lattice Degrees of Freedom, Phys. Rev. Lett. 111, 047004 (2013).
4. A. F. Kemper, T. A. Maier, S. Graser, H.-P. Cheng, P. J. Hirschfeld, and D. J. Scalapino, Sensitivity of the Superconducting State and Magnetic Susceptibility to Key Aspects of Electronic Structure in Ferropnictides, New J. Phys. 12, 073030 (2010).
5. P. J. Hirschfeld, M. M. Korshunov, and I. I. Mazin, Gap Symmetry and Structure of Fe-Based Superconductors, Rep. Prog. Phys. 74, 124508 (2011).
6. S. He et al., Phase Diagram and Electronic Indication of High-Temperature Superconductivity at 65 K in Single- Layer FeSe Films, Nat. Mater. 12, 605 (2013).
7. 3 due to Anomalous Interfacial Mode Coupling, arXiv:1312.2633.
8. R. Thomale, C. Platt, J. Hu, C. Honerkamp, and B. Andrei Bernevig, Functional Renormalization-Group Study of the Doping Dependence of Pairing Symmetry in the Iron Pnictide Superconductors, Phys. Rev. B 80, 180505 (2009).
9. R. Thomale, C. Platt, W. Hanke, and B. Andrei Bernevig, Mechanism for Explaining Differences in the Order Parameters of FeAs-Based and FeP-Based Pnictide Superconductors, Phys. Rev. Lett. 106, 187003 (2011).
10. L. Sun, X.-J. Chen, J. Guo, P. Gao, Q.-Z. Huang, H. Wang, M. Fang, X. Chen, G. Chen, Q. Wu, C. Zhang, D. Gu, X. Dong, L. Wang, K. Yang, A. Li, X. Dai, H.-k. Mao, and Z. Zhao, Re-emerging Superconductivity at 48 Kelvin in Iron Chalcogenides, Nature (London) 483, 67 (2012).
11. 2, Nat. Phys. 9, 349 (2013).
12. 2: A Possible Link between Inelastic Scattering and Pairing Symmetry, Phys. Rev. B 89, 134502 (2014).
13. 2 from Inelastic Neutron Scattering, Nature (London) 456, 930 (2008).
14. H. Kontani and S. Onari, Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five- Orbital Hubbard-Holstein Model, Phys. Rev. Lett. 104, 157001 (2010).
15. S. Graser, T. A. Maier, P. J. Hirschfeld, and D. J. Scalapino, Near-Degeneracy of Several Pairing Channels in Multiorbital Models for the Fe Pnictides, New J. Phys. 11, 025016 (2009).
16. 2, Phys. Rev. B 81, 214503 (2010).
17. T. Hanaguri, S. Niitaka, K. Kuroki, and H. Takagi, Unconventional s-Wave Superconductivity in Fe(Se, Te), Science 328, 474 (2010).
18. T. P. Devereaux and R. Hackl, Inelastic Light Scattering from Correlated Electrons, Rev. Mod. Phys. 79, 175 (2007).
19. A. J. Leggett, Number-Phase Fluctuations in Two-Band Superconductors, Prog. Theor. Phys. 36, 901 (1966).
20. 2, Phys. Rev. B 82, 014507 (2010).
21. 2 Superconductor, Phys. Rev. Lett. 99, 227002 (2007).
22. R. Sooryakumar and M. V. Klein, Raman Scattering by Superconducting-Gap Excitations and Their Coupling to Charge-Density Waves, Phys. Rev. Lett. 45, 660 (1980).
23. P. B. Littlewood and C. M. Varma, Gauge-Invariant Theory of the Dynamical Interaction of Charge Density Waves and Superconductivity, Phys. Rev. Lett. 47, 811 (1981).
24. I. Tütto and A. Zawadowski, Theory of Raman Scattering of Superconducting Amplitude Modes in Charge-Density- Wave Superconductors, Phys. Rev. B 45, 4842 (1992).
25. C. M. Varma, Higgs Boson in Superconductors, J. Low Temp. Phys. 126, 901 (2002).
26. Y. Barlas and C. M. Varma, Amplitude or Higgs Modes in d-Wave Superconductors, Phys. Rev. B 87, 054503 (2013).
27. D. Einzel (private communication).
28. P. B. Littlewood and C. M. Varma, Amplitude Collective Modes in Superconductors and Their Coupling to Charge- Density Waves, Phys. Rev. B 26, 4883 (1982).
29. 3Sn, J. Phys. C 16, 1729 (1983).
30. R. Hackl, R. Kaiser, andW. Gläser, Electronic and Phonon- Mediated Gap Modes in A15 Compounds, Physica (Amsterdam) 162C-164C, 431 (1989).
31. M.-A. Méasson, Y. Gallais, M. Cazayous, B. Clair, P. Rodière, L. Cario, and A. Sacuto, Amplitude Higgs Mode in the 2H-NbSe2 Superconductor, Phys. Rev. B 89, 060503 (2014).
32. W. Rehwald, M. Rayl, R.W. Cohen, and G. D. Cody, Elastic Moduli and Magnetic Susceptibility of Monocrystalline Nb3Sn, Phys. Rev. B 6, 363 (1972).
33. c BCS Superconductors: Collective Modes, Phys. Rev. B 41, 8798 (1990).
34. A. Bardasis and J. R. Schrieffer, Excitons and Plasmons in Superconductors, Phys. Rev. 121, 1050 (1961).
35. M. V. Klein and S. B. Dierker, Theory of Raman Scattering in Superconductors, Phys. Rev. B 29, 4976 (1984).
36. A. V. Chubukov, I. Eremin, and M. M. Korshunov, Theory of Raman Response of a Superconductor with Extended s-Wave Symmetry: Application to the Iron Pnictides, Phys. Rev. B 79, 220501 (2009).
37. T. P. Devereaux and D. Einzel, Electronic Raman Scattering in Superconductors as a Probe of Anisotropic Electron Pairing, Phys. Rev. B 51, 16 336 (1995).
38. T. J. Greytak and J. Yan, Light Scattering from Rotons in Liquid Helium, Phys. Rev. Lett. 22, 987 (1969).
39. A. Zawadowski, J. Ruvalds, and J. Solana, Bound Roton Pairs in Superfluid Helium, Phys. Rev. A 5, 399 (1972).
40. 2 Superconductors, Phys. Rev. Lett. 110, 187002 (2013).
41. D. J. Scalapino and T. P. Devereaux, Collective d-Wave Exciton Modes in the Calculated Raman Spectrum of Fe-Based Superconductors, Phys. Rev. B 80, 140512 (2009).
42. W.-C. Lee, S.-C. Zhang, and C. Wu, Pairing State with a Time-Reversal Symmetry Breaking in FeAs-Based Superconductors, Phys. Rev. Lett. 102, 217002 (2009).
43. W.-C. Lee and P.W. Phillips, Orbital Resonance Mode in Superconducting Iron Pnictides, Europhys. Lett. 103, 57 003 (2013).
44. T. P. Devereaux, Theory for the Effects of Impurities on the Raman Spectra of Superconductors, Phys. Rev. B 45, 12 965 (1992).
45. T. P. Devereaux, Theory for the Effects of Impurities on the Raman Spectra of Superconductors. II. Temperature Dependence and Influence of Final-State Interactions, Phys. Rev. B 47, 5230 (1993).
46. D. Manske, Theory of Unconventional Superconductors, Springer Tracts in Modern Physics Vol. 202 (Springer, New York, 2004).
47. 2, Phys. Rev. B 79, 054517 (2009).
48. 2 as Seen via Electronic Raman Scattering, Phys. Rev. B 80, 180510 (2009).
49. 2g symmetry.
50. What we call background here is the particle-hole continuum containing information on the electron dynamics that can be extracted in a similar way as from the optical conductivity [51]. Since we do not have a microscopic model, we use a smooth analytic function to approximate it, so as to extract reliably the peak frequencies of the pair-breaking maximum and the BS mode.
51. c Cuprates: A Raman Scattering Study, Phys. Rev. B 61, 9752 (2000).
52. 2 via Band-Structure Calculations and Electronic Raman Scattering, Phys. Rev. B 82, 180502 (2010).
53. 2 Pairing, Phys. Rev. Lett. 72, 396 (1994).
54. P. B. Allen, Fermi-Surface Harmonics: A General Method for Nonspherical Problems. Application to Boltzmann and Eliashberg Equations, Phys. Rev. B 13, 1416 (1976).
55. W. Hayes and R. Loudon, Scattering of Light by Crystals (Dover, New York, 2005).
56. N.W. Ashcroft and N. D. Mermin, Solid State Physics (Saunder College, Philadelphia, 1976), p. 848.
57. 2, Phys. Rev. B 82, 180521 (2010).
58. T. Tsuneto, Transverse Collective Excitations in Superconductors and Electromagnetic Absorption, Phys. Rev. 118, 1029 (1960).
59. T. P. Devereaux, A. Virosztek, and A. Zawadowski, Multiband Electronic Raman Scattering in Bilayer Superconductors, Phys. Rev. B 54, 12 523 (1996).
60. G. R. Boyd, T. P. Devereaux, P. J. Hirschfeld, V. Mishra, and D. J. Scalapino, Probing the Pairing Symmetry of the Iron Pnictides with Electronic Raman Scattering, Phys. Rev. B 79, 174521 (2009).
61. 2 Studied by Angle-Resolved Photoemission Spectroscopy, Europhys. Lett. 85, 67 002 (2009).
62. x an Electron-Phonon Superconductor?, Phys. Rev. Lett. 101, 026403 (2008).
63. 2 (R = Ba, Sr) Investigated by Raman Light Scattering, Phys. Rev. B 80, 064509 (2009).
64. R. Yu, P. Goswami, Q. Si, P. Nikolic, and J.-X. Zhu, Superconductivity at the Boarder of Electron Localization and Itineracy, Nat. Commun. 4, 2783 (2013).
65. 2 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy, Phys. Rev. Lett. 106, 187001 (2011).
66. 2 Superconductors, Phys. Rev. B 84, 024529 (2011).
67. 2, Europhys. Lett. 99, 67 001 (2012).
68. M. Khodas and A. V. Chubukov, Interpocket Pairing and Gap Symmetry in Fe-Based Superconductors with Only Electron Pockets, Phys. Rev. Lett. 108, 247003 (2012).
69. C.-H. Lin, T. Berlijn, L. Wang, C.-C. Lee, W.-G. Yin, and W. Ku, One-Fe versus Two-Fe Brillouin Zone of Fe-Based Superconductors: Creation of the Electron Pockets by Translational Symmetry Breaking, Phys. Rev. Lett. 107, 257001 (2011).
70. H.-M. Eiter, M. Lavagnini, R. Hackl, E. A. Nowadnick, A. F. Kemper, T. P. Devereaux, J.-H. Chu, J. G. Analytis, I. R. Fisher, and L. Degiorgi, Alternative Route to Charge Density Wave Formation in Multiband Systems, Proc. Natl. Acad. Sci. U.S.A. 110, 64 (2013).