Superconducting anisotropy in single-crystalline Ba(Fe0.93Co0.07)2As2 near Tc

✍ Scribed by T. Nojima; Y. Honda; Y. Nakajima; T. Tamegai

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 228 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.11.090

✦ Synopsis

The superconducting anisotropy c has been studied on single-crystalline Ba(Fe 0.93 Co 0.07 ) 2 As 2 ðT c ¼ 22:5 KÞ at temperatures T P 20 K and fields H 6 10 T by measuring magnetic torque s as a function of angle h between the c axis and the H direction. The reversible part in sðhÞ can be well-described with c ¼ 3-3:5, which is almost T and H independent within the measurement range. The result manifests that this material, known as the multigap superconductor, behaves as a simple anisotropic superconductor at least near T c . The irreversible part in sðhÞ shows broad peak at h ¼ 90 , indicating the absence of strong layer pinning.