Unusual superconducting state at 49 K in electron-doped CaFe 2As 2at ambient pressure

Proceedings of the National Academy of Sciences of the United States of America

Volumn 108, Issue 38, 2011, Pages 15705-15709

  Lv, Bing ^a   Deng, Liangzi ^a,b   Gooch, Melissa ^a   Wei, Fengyan ^a,b   Sun, Yanyi ^a   Meen, James K ^a,b   Xue, Yu Yi ^a,b   Lorenz, Bernd ^a,b   Chu, Ching Wu ^a,b,c  

^a UNIVERSITY OF HOUSTON   (United States)

^b University of Houston   (United States)

^c LAWRENCE BERKELEY NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; CONDUCTANCE; ELECTRON; LOW TEMPERATURE; MAGNETIC FIELD; PRESSURE MEASUREMENT; PRIORITY JOURNAL; TRANSITION TEMPERATURE; X RAY DIFFRACTION;

ARSENICALS; ATMOSPHERIC PRESSURE; CALCIUM COMPOUNDS; CRYSTALLIZATION; ELECTRIC CONDUCTIVITY; ELECTRONS; FERROUS COMPOUNDS; PHASE TRANSITION; TRANSITION TEMPERATURE; X-RAY DIFFRACTION;

EID: 80053138822     PISSN: 00278424     EISSN: 10916490     Source Type: Journal    
DOI: 10.1073/pnas.1112150108     Document Type: Article

References (29)

1. c = 26 K. J Am Chem Soc 130:3296-3297.
2. x . Phys Rev B Condens Matter Mater Phys 78:012505.
3. 2. Phys Rev Lett 101:107006.
4. 2 with A = K and Cs with transition temperatures up to 37 K. Phys Rev Lett 101:107007.
5. c = 18 K. Phys Rev B Condens Matter Mater Phys 78:060505(R).
6. 1-xFeAs induced by pressure. Europhys Lett 88:47008.
7. 2 (0 ≤ x ≤ 1.0). Phys Rev B Condens Matter Mater Phys 82:180520(R).
8. Hsu FC, et al. (2008) Superconductivity in the PbO-type structure α-FeSe. Proc Natl Acad Sci USA 105:14262-14264.
9. c = 37 K). Phys Rev B Condens Matter Mater Phys 80:064506.
10. x. Nature 453:761-762.
11. 0.15FeAs. J Supercond Nov Magn 21:213-215.
12. c cuprate superconductors. Phys Rev B Condens Matter Mater Phys 78:180508(R).
13. Chu CW (2011) 100 Years of Superconductivity, eds H Rogalla and PH Kes (Chapman & Hall/CRC), Chapter 4 (in press).
14. Ishida K, Nakai Y, Hosono H (2009) To what extent iron-pnictide new superconductors have been clarified: A progress report. J Phys Soc Jpn 78:062001.
15. Johnston DC (2010) The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides. Adv Phys 59:803-1061.
16. Paglione J, Greene RL (2010) High-temperature superconductivity in iron-based materials. Nat Phys 29:645-658.
17. x)OFeAs. Europhys Lett 82:17009.
18. 1-δ. Phys Rev B Condens Matter Mater Phys 78:092503.
19. c = 22 K. Phys Rev B Condens Matter Mater Phys 82:180512(R).
20. Tokura Y, Takagi H, Uchida S (1989) A superconducting copper oxide compound with electrons as the charge carriers. Nature 337:345-347.
21. Mazin II (2010) Superconductivity gets an iron boost. Nature 464:183-186.
22. Marsiglio F, Hirsch JE (2008) Hole superconductivity in arsenic-iron compounds. Physica C 468:1047-1052.
23. 2 at high pressures. J Phys Condens Matter 21:012208.
24. 2. J Phys Condens Matter 22:222203.
25. 2. Phys Rev Lett 101:057006.
26. 2under pressure: A single-crystal neutron and X-ray diffraction investigation. Phys Rev B Condens Matter Mater Phys 79:024513.
27. 2 under hydrostatic pressure. Phys Rev B Condens Matter Mater Phys 79:020511(R).
28. Allender D, Bray J, Bardeen J (1973) Model for an exciton mechanism of superconductivity. Phys Rev B Condens Matter Mater Phys 7:1020-1029.
29. Saha SR, et al. (2011) Structural collapse and 45 K superconductivity in electron-doped CaFe2As2. arXiv:1105.4798v1 [cond-mat.supr-con].