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Phase diagram and calorimetric properties of NaFe1-xCox As.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Jun2012, Vol. 85 Issue 22, p1-7. 7p. - Publication Year :
- 2012
-
Abstract
- We measured the resistivity and magnetic susceptibility to map out the phase diagram of single crystalline NaFe1-xCoxAs. Replacement of Fe by Co suppresses both the structural and magnetic transitions; however, it also enhances the superconducting transition temperature (Tc) and superconducting component fraction. Magnetic susceptibility exhibits temperature-linear dependence in high temperatures up to 500 K for all the superconducting samples, but such behavior suddenly breaks down for the nonsuperconducting overdoped crystal, suggesting that the superconductivity is closely related to the T-linear dependence of susceptibility. Analysis on the superconducting-state specific heat of the optimally doped crystal provides strong evidence for a two-band s-wave order parameter with gap amplitudes of &Dgr;1(0)/kBTC = 1.78 and &Dgr;2(0)/kBTC = 3.11, being consistent with the nodeless gap symmetry revealed by angle-resolved photoemission spectroscopy experiment. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 85
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 78584470
- Full Text :
- https://doi.org/10.1103/PhysRevB.85.224521