Hall coefficient and Hc2 in underdoped LaFeAsO0.95F0.05

Details Hall coefficient and Hc2 in underdoped LaFeAsO0.95F0.05 Hall coefficient and Hc2 in underdoped LaFeAsO0.95F0.05

2008-06-26

arxiv.org/abs/0806.4215v1

Europhys Letters, 84 (2008) 37005

Physics

Condensed Matter

Superconductivity

12 pages and 4 figures

Scientific paper

10.1209/0295-5075/84/37005

The electrical resistivity and Hall coefficient of LaFeAsO0.95F0.05 polycrystalline samples were measured in pulsed magnetic fields up to m0H = 60 T from room temperature to 1.5 K. The resistance of the normal state shows a negative temperature coefficient (dr/dT < 0) below 70 K for this composition, indicating insulating ground state in underdoped LaFeAsO system in contrast to heavily doped compound. The charge carrier density obtained from Hall effect can be described as constant plus a thermally activated term with an energy gap DE = 630 K. Upper critical field, Hc2, estimated from resistivity measurements, exceeds 75 T with zero-field Tc = 26.3 K, suggesting an unconventional nature for superconductivity.

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