Effect of external magnetic field on superconducting and spin density wave gaps of high-Tc superconductors |
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Authors: | B. Pradhan B.K. Raj G.C. Rout |
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Affiliation: | 1. Govt. Science College, Malkangiri 764 048, India;2. B.J.B. College, Bhubaneswar 751 014, India;3. Condensed Matter Physics Group P.G. Dept. of Applied Physics and Ballistics, F.M. University, Balasore 756 019, India |
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Abstract: | A theoretical model is addressed here to study the interplay of the superconductivity (SC) and the spin density wave (SDW) long range orders in underdoped region in the vicinity of on-set of superconductivity in presence of an external magnetic field. The order parameters are calculated by using Zubarev’s technique of Green’s functions and determined numerically self-consistently. The gap parameters are found to be strongly coupled to each other through their coupling constants. The interplay displays BCS type two gaps in the quasi-particle density of states (DOS) which resemble the tunneling conductance of STM experiments. The gap edges in the DOS appear at ±(z+z1) and ±(z-z1). The applied magnetic field further induces Zeeman splitting which is explained on the basis of spin-filter effect of tunneling experiment. |
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Keywords: | 74.90.+n 75.30.Fv 71.70.Ej |
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