期刊
PHYSICAL REVIEW B
卷 79, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.020508
关键词
coherence length; fluctuations in superconductors; high-temperature superconductors; iron compounds; magnetisation; neodymium compounds; penetration depth (superconductivity); specific heat; superconducting critical field
资金
- Department of Energy
- Basic Energy Sciences [DEAC02-07CH11358]
- Slovak Research and Development Agency [LPP-0101-06]
The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (T-c similar to 32-35 K). The anisotropy of the penetration depth (Gamma(lambda)) is temperature independent and on the order of 4.0 +/- 1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Gamma(xi)similar to 5.5 +/- 1.5 close to T-c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (similar to 5 K large at 2 T).
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