Change of electronic state and crystal structure by postannealing in superconducting SrFe2(As0.65P0.35)2
T. Kobayashi, S. Miyasaka, S. Tajima, T. Nakano, Y. Nozue, N. Chikumoto, H. Nakao, R. Kumai, Y. Murakami
DOI 10.1103/PhysRevB.87.174520 · Physical Review B
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Abstract
We investigated the annealing effects on the physical properties of SrFe2(As1−xPx)2(x=0.35). The superconducting transition temperature (Tc) increased from 26 to 33 K by annealing. The x-ray diffraction measurement suggested that the annealed crystals have the shorter/longer a/c axes and the larger pnictogen height hPn. This must be linked to the Tc enhancement by annealing. Moreover, it was found that the postannealing decreased the electronic specific heat coefficient at T=0K,γr, and changed the magnetic field (H) dependence from sublinear γr∝H0.7 to H linear γr∝H. This can be attributed the electronic change from dirty to clean superconductors with a s± gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | midpoint |
| SrFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | midpoint |
| SrFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| SrFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | onset |
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