Log-T divergence and insulator-to-metal crossover in the normal state resistivity of fluorine doped AmFeAsO1-xFx
- Los Alamos National Laboratory
- FL STATE UNIV
- CHINA
We report the resistivity of a series of fluorine-doped SmFeAsO{sub 1-x}F{sub x} polycrystalline superconductors in magnetic fields up to 60T. For underdoped samples (x < 0.15), the low-temperature resistive state is characterized by pronounced magneto-resistance and a resistive upturn at low temperatures. The 'insulating behavior' is characterized by a log-T divergence observed over a decade in temperature. In contrast, the normal state for samples with doping x > 0.15 display metallic behavior with little magnetoresistance, where intense magnetic fields broaden the superconducting transition rather than suppress T{sub c}. The location of the insulator-to-metal crossover coincides with the reported suppression of the structural phase transition (SPT) in the phase diagram for SmFeAsO{sub 1-x}F{sub x} series.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 960579
- Report Number(s):
- LA-UR-08-05343; LA-UR-08-5343; PRLTAO; TRN: US1002075
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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