Physics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11d5003w&link_type=abstract
New Journal of Physics, Volume 11, Issue 4, pp. 045003 (2009).
Physics
62
Scientific paper
In this paper, we systematically study the transport, susceptibility and heat capacity of single crystals of BaFe2-xCoxAs2. In the underdoped region, spin density wave (SDW) transition was observed in both resistivity and susceptibility. The magnetic susceptibility shows unusual T-linear dependence above the SDW transition up to 700 K. With Co doping, SDW ordering is gradually suppressed and superconductivity emerges with a dome-like shape. The electrical transport, specific heat and magnetic susceptibility indicate that the SDW and superconductivity coexist in the BaFe2-xCoxAs2 sample around x=0.17, similar to the case of (Ba,K)Fe2As2. The superconductivity completely disappears for samples with x>0.34. A crossover from the SDW state to the Fermi-liquid state is observed with an increase in Co doping. A detailed electronic phase diagram of the evolution from the SDW to the superconducting state is given.
Chen Haibin
Chen Hua-Xing
Liu Hu Ran
Wang Xiang-Feng
Wu Guangheng
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