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@ARTICLE{Prozorov2009,
  author = {R. Prozorov and M.A. Tanatar and R.T. Gordon and C. Martin and H.
	Kim and V.G. Kogan and N. Ni and M.E. Tillman and S.L. Bud'ko and
	P.C. Canfield},
  title = {Anisotropic London penetration depth and superfluid density in single
	crystals of iron-based pnictide superconductors},
  journal = {Physica C: Superconductivity},
  year = {2009},
  volume = {469},
  pages = {582 - 589},
  number = {9-12},
  note = {Superconductivity in Iron-Pnictides},
  abstract = {In- and out-of-plane magnetic penetration depths were measured in
	three iron-based pnictide superconducting systems. The 122 system
	was represented by electron-doped Ba(Fe1-xCox)2As2 with the doping
	through the whole phase diagram with x [approximate] 0.038, 0.047,
	0.058, 0.074 and 0.10 (Tc ranged from 13 to 24 K) and by hole-doped
	(Ba1-xKx)Fe2As2 with doping close to optimal, with measured x [approximate] 0.45
	(Tc [approximate] 28 K) and an underdoped sample with x [approximate] 0.15
	(Tc [approximate] 19 K). The 1111 system was represented by single
	crystals of NdFeAs(O1-xFx) with nominal x = 0.1 (Tc [approximate] 43 K).
	All studied samples of both 122 systems show a robust power-law behavior,
	[lambda](T)[is proportional to]Tn, with the sample-dependent exponent
	n = 2-2.5, which is indicative of unconventional pairing. This scenario
	could be possible either through scattering in a S± state or due
	to nodes in the superconducting gap. In the Nd-1111 system, the interpretation
	of the results is complicated by magnetism of the rare-earth ions.
	For all three systems, the anisotropy ratio, [gamma][lambda][reverse
	not equivalent][lambda]c/[lambda]ab, was found to decrease with increasing
	temperature, whereas the anisotropy of the coherence lengths, , has
	been found to increase (both opposite to the trend in two-band MgB2).
	The overall anisotropy of the pnictide superconductors is small,
	in fact much smaller than that of the cuprates (except YBa2Cu3O7-x
	(YBCO)). The 1111 system is about two times more anisotropic than
	the 122 system. Our data and analysis suggest that the iron-based
	pnictides are complex superconductors in which a multiband three-dimensional
	electronic structure and strong magnetic fluctuations play important
	roles.},
  doi = {DOI: 10.1016/j.physc.2009.03.012},
  issn = {0921-4534},
  keywords = {Penetration depth},
  owner = {Ruslan Prozorov},
  url = {http://dx.doi.org/10.1016/j.physc.2009.03.012}
}