Journal
JOURNAL OF APPLIED PHYSICS
Volume 103, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2839589
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To study the magnetic and superconducting properties of the Na(x)CoO(2)center dot yH(2)O materials, we perform quantum Monte Carlo calculation on the single-band Hubbard model on a triangular lattice. Through the observation of magnetic susceptibility as a function of electron filling and temperature, it is interesting to see that the ferromagnetic fluctuation dominates in the high-filling region < n >=1.5-1.85 and competes with the antiferromagnetic fluctuation in the filling region < n >similar to 1.33. We also observe that triplet pairing is favorable around the ferromagnetic region, and the f-wave pairing correlation tends to increase faster with decreasing temperature than other pairing channels. (C) 2008 American Institute of Physics.
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