Physics – Condensed Matter – Superconductivity
Scientific paper
2008-10-17
Phys. Rev. B 79, 014514 (2009)
Physics
Condensed Matter
Superconductivity
23 pages, 7 figures. accepted in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.79.014514
Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used to investigate the vortex phase diagram of an under-doped Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used to investigate the vortex phase diagram of an under-doped (Ba,K)Fe2As2 single crystal with Tc=26.2 K. It is found that the anisotropy ratio of the upper critical field Hc2 decreases from 4 to 2.8 with decreasing temperature from Tc to 24.8 K. Consistent with the vortex-glass theory, the I-V curves measured at H=9 T can be well scaled with the vortex-glass transition temperature of Tg=20.7 K and critical exponents z=4.1 and v=1. Analyses in different magnetic fields produced almost identical critical exponent values, with some variation in Tg, corroborating the existence of the vortex-glass transition in this under-doped (Ba,K)Fe2As2 single crystal up to 9 T. A vortex phase diagram is presented, based on the evolution of Tg and Hc2 with magnetic field.
Khim Seunghyun
Kim Hyeong-Jin
Kim Ingyu
Kim Kee Hoon
Liu Yong.
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