Back to Search
Start Over
Anisotropic Hc2 of K0.8Fe1.76Se2 determined up to 60 T.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Mar2011, Vol. 83 Issue 10, p100514.1-100514.4. 4p. - Publication Year :
- 2011
-
Abstract
- The anisotropic upper critical field, Hc2(T), curves for K0.8Fe1.76Se2 are determined over a wide range of temperatures down to 1.5 K and magnetic fields up to 60 T. Anisotropic initial slopes of Hc2 ∼ -1.4 T/K and -4.6 T/K for magnetic field applied along c axis and ab plane, respectively, were observed. Whereas the c axis Hc2c (T) increases quasilinearly with decreasing temperature, the ab plane Hc2ab(T) shows a flattening, starting near 25 K above 30 T. This leads to a nonmonotonic temperature dependence of the anisotropy parameter γH≡ Hc2ab/Hc2c. The anisotropy parameter is ∼2 near Tc∼32 K and rises to a maximum γH∼ 3.6 around 27 K. For lower temperatures, γH decreases with T in a linear fashion, dropping to γH∼2.5 by T∼18 K. Despite the apparent differences between the K0.8Fe1.76Se2 and (Ba0.55K0.45)Fe2As2 or Ba(Fe0.926Co0.074)2As2, in terms of the magnetic state and proximity to an insulating state, the Hc2(T) curves are remarkably similar. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANISOTROPY
*SUPERCONDUCTORS
*MAGNETIC fields
*QUASILINEARIZATION
*LOW temperatures
Subjects
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 83
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 67419164
- Full Text :
- https://doi.org/10.1103/PhysRevB.83.100514