Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)(2)As-2
Yamamoto, A; Jaroszynski, J; Tarantini, C; Balicas, L; Jiang, J; Gurevich, A; Larbalestier, DC; Jin, R; Sefat, AS; Mcguire, MA; Sales, BC; Christen, DK; Mandrus, D
| HERO ID | 4797519 |
|---|---|
| In Press | No |
| Year | 2009 |
| Title | Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)(2)As-2 |
| Authors | Yamamoto, A; Jaroszynski, J; Tarantini, C; Balicas, L; Jiang, J; Gurevich, A; Larbalestier, DC; Jin, R; Sefat, AS; Mcguire, MA; Sales, BC; Christen, DK; Mandrus, D |
| Journal | Applied Physics Letters |
| Volume | 94 |
| Issue | 6 |
| Abstract | We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe1-xCox)(2)As-2. Unlike the high-temperature superconductor cuprates and 1111-phase oxypnictides, Ba(Fe1-xCox)(2)As-2 showed practically no broadening of the resistive transitions under magnetic fields up to 45 T. We report the temperature dependencies of the upper critical field H-c2 both parallel and perpendicular to the c-axis, the irreversibility field H-irr(c)(T), and a rather unusual symmetric volume pinning force curve F-p(H) suggestive of a strong pinning nanostructure. The anisotropy parameter gamma=H-c2(ab)/H-c2(c) deduced from the slopes of dH(c2)(ab)/dT=4.9 T/K and dH(c2)(c)/dT=2.5 T/K decreases from similar to 2 near T-c, to similar to 1.5 at lower temperatures, much smaller than gamma for 1111pnictides and high-T-c cuprates. |
| Doi | 10.1063/1.3081455 |
| Wosid | WOS:000263409400068 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | barium compounds; cobalt compounds; doping profiles; fluctuations in superconductors; flux pinning; galvanomagnetic effects; high-temperature superconductors; iron compounds; magnetic anisotropy; magnetisation; nanostructured materials; superconducting critical field; superconducting transition temperature; superconducting transitions |