Journal
PHYSICAL REVIEW B
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024508
Keywords
arsenic alloys; barium alloys; calcium alloys; iron alloys; magnetic susceptibility; muon probes; phase separation; potassium alloys; sodium alloys; strontium alloys; superconducting energy gap; superconducting materials; superconductivity
Funding
- NSF [DMR-05-02706, 08-06846, DMR-07-56568, DMR-08-04173]
- Florida state at FSU
- DOE [DE-AC02-07CH11358]
- NSERC
- CIFAR (Canada)
- CBPF (Brazil)
- NSFC
- CAS
- 973 project of MOST (China)
- JSPS U. S.-Japan
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0756568] Funding Source: National Science Foundation
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By muon spin-relaxation measurements on single-crystal specimens, we show that superconductivity in the AFe(2)As(2) (A=Ca,Ba,Sr) systems, in both the cases of composition and pressure tunings, coexists with a strong static magnetic order in a partial volume fraction. The superfluid response from the remaining paramagnetic volume fraction of (Ba0.5K0.5)Fe2As2 exhibits a nearly linear variation in T at low temperatures, suggesting an anisotropic energy gap with line nodes and/or multigap effects.
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