Integer and half-integer flux-quantum transitions in a niobium-iron pnictide loop

Nature Physics

Volumn 6, Issue 4, 2010, Pages 260-264

  Chen, C T ^a   Tsuei, C C ^a   Ketchen, M B ^a   Ren, Z A ^b   Zhao, Z X ^b  

^a IBM T J WATSON RESEARCH CENTER   (United States)

^b INSTITUTE OF PHYSICS   (China)

Author keywords

[No Author keywords available]

Indexed keywords

ARSENIC COMPOUNDS; FLUORINE COMPOUNDS; IRON COMPOUNDS; NEODYMIUM COMPOUNDS; NIOBIUM; QUANTUM INTERFERENCE DEVICES; SHEAR WAVES;

FE-AS BASED SUPERCONDUCTORS; FERMI SURFACE TOPOLOGY; HALF-INTEGER FLUX QUANTA; HIGH-TEMPERATURE SUPERCONDUCTIVITY; MICROSCOPIC MODELS; PAIRING SYMMETRIES; PHASE-SENSITIVE TECHNIQUE; POLYCRYSTALLINE IRON;

IRON-BASED SUPERCONDUCTORS;

EID: 77950488944     PISSN: 17452473     EISSN: 17452481     Source Type: Journal    
DOI: 10.1038/nphys1531     Document Type: Article

References (30)

1. x D 0:05-0:12) with Tc D 26 K. J. Am. Chem. Soc. 130, 3296-3297 (2008). (Pubitemid 351456027)
2. x FeAs. Europhys. Lett. 82, 57002 (2008).
3. 2 . Phys. Rev. Lett. 101, 107006 (2008).
4. x V A low carrier density superconductor near itinerant magnetism. Phys. Rev. Lett. 100, 237003 (2008).
5. Ding, H. et al. Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0:6K0:4Fe2As2. Europhys. Lett. 83, 47001 (2008).
6. x FeAs systems. Nature 453, 899-902 (2008). (Pubitemid 351832571)
7. Yang, W. L. et al. Evidence for weak electronic correlations in iron pnictides. Phys. Rev. B 80, 014508 (2009).
8. Mazin, I. I.& Schmalian, J. Pairing symmetry and pairing state in ferropnictides: Theoretical overview. Physica C 469, 614-627 (2009).
9. x . Phys. Rev. Lett. 101, 057003 (2008).
10. x . Phys. Rev. Lett. 101, 087004 (2008).
11. Chen, W.-Q., Yang, K.-Y., Zhou, Y. & Zhang, F.-C. Strong coupling theory for superconducting iron pnictides. Phys. Rev. Lett. 102, 047006 (2008).
12. Graser, S., Maier, T. A., Hirschfeld, P. J. & Scalpino, D. J. Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides. New J. Phys. 11, 025016 (2009).
13. Wang, F., Zhai, H., Ran, Y., Vishwanath, A. & Lee, D.-H. Functional renormalization-group study of the pairing symmetry and pairing mechanism of the FeAs-based high-temperature superconductor. Phys. Rev. Lett. 102, 047005 (2009).
14. Seo, K., Bernevig, B. A. & Hu, J. Pairing symmetry in a two-orbital exchange coupling model of oxypnictides. Phys. Rev. Lett. 101, 206404 (2008).
15. Lee, P. A. & Wen, X. G. Spin-triplet p-wave pairing in a three-orbital model for iron pnictide superconductors. Phys. Rev. B 78, 144517 (2008).
16. Si, Q. & Abrahams, E. Strong correlations in magnetic frustration in the high Tc iron pnictides. Phys. Rev. Lett. 101, 076401 (2008).
17. Zhang, X. et al. Observation of the Josephson effect in Pb=Ba1-xKxFe2As2 single crystal junctions. Phys. Rev. Lett. 102, 147002 (2009).
18. Christianson, A. D. et al. Unconventional superconductivity in Ba0:6K0:4Fe2As2 from inelastic neutron scattering. Nature 456, 930-932 (2008).
19. Tsuei, C. C. & Kirtley, J. R. Pairing symmetry in cuprate superconductors. Rev. Mod. Phys. 72, 969-1016 (2000).
20. y from scanning SQUID microscopy. J. Phys. Soc. Jpn 78, 013708 (2009).
21. Martin, C. et al. Non-exponential London penetration depth in RFeAsO0:9F0:1RDLa, Nd single crystals. Phys. Rev. Lett. 102, 247002 (2009).
22. 1-y single crystals: Evidence for a full-gap superconductor. Phys. Rev. Lett. 102, 017002 (2009).
23. x ) revealed by 75As and 139La nuclear magnetic resonance. J. Phys. Soc. Jpn 77, 073701 (2008).
24. Chen, T. Y., Tesanovic, Z., Liu, R. H., Chen, X. H. & Chien, C. L. The BCS-like gap in superconductor SmFeAsO0:85F0:15. Nature 453, 1224-1227 (2008).
25. Gough, C. E. et al. Flux quantization in a high-Tc superconductor. Nature 326, 835 (1987).
26. Chen, W. Q., Ma, F., Liu, Z. Y. & Zhang, F. C.π-junction to probe antiphase s-wave pairing in iron pnictide superconductors. Phys. Rev. Lett. 103, 207001 (2009).
27. Parker, D. & Mazin, I. I. Possible phase-sensitive tests of pairing symmetry in pnictide superconductors. Phys. Rev. Lett. 102, 227007 (2009).
28. Lazarides, N. Mobileπ-links and half-integer zero-field-like steps in highly discrete alternation 0-π Josephson junction arrays. Supercond. Sci. Technol. 21, 045003 (2008). (Pubitemid 351763282)
29. Chandran, M. & Kulkarni, R. V. Fractionalization of a flux quantum in a one-dimensional parallel Josephson junction array with alternatingπ junctions. Phys. Rev. B 68, 104505 (2003).
30. Ryazanov, V. V. et al. Coupling of two superconductors through a ferromagnet: Evidence for aπ junction. Phys. Rev. Lett. 86, 2427-2430 (2001).