Kinetic energy driven superconductivity in the electron doped cobaltate Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O

Bin Liu; Ying Liang; Shiping Feng; Wei Yeu Chen

doi:10.1088/0253-6102/43/6/034

paper

Kinetic energy driven superconductivity in the electron doped cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O

arXiv:cond-mat/0405168 · doi:10.1088/0253-6102/43/6/034

Abstract

Within the charge-spin separation fermion-spin theory, we have shown that the mechanism of superconductivity in the electron doped cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O is ascribed to its kinetic energy. The dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions, then the electron Cooper pairs originating from the dressed fermion pairing state are due to the charge-spin recombination, and their condensation reveals the superconducting ground state. The superconducting transition temperature is identical to the dressed fermion pair transition temperature, and is suppressed to a lower temperature due to the strong magnetic frustration. The optimal superconducting transition temperature occurs in the electron doping concentration $δ \approx 0.29$ , and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results.

6 pages, 2 figs, corrected typos, accepted for publication in Commun. Theor. Phys

Kinetic energy driven superconductivity in the electron doped cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O

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Kinetic energy driven superconductivity in the electron doped cobaltate Nax​CoO2​⋅yH2​O

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Cited by in corpus (9)

Kinetic energy driven superconductivity in the electron doped cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O