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Title: Metallic state in La-doped YBa 2Cu 3O y thin films with n-type charge carriers
Authors: Zeng, S.W.
Wang, X.
Lü, W.M.
Huang, Z.
Motapothula, M.
Liu, Z.Q.
Zhao, Y.L.
Annadi, A.
Dhar, S. 
Mao, H. 
Chen, W. 
Venkatesan, T. 
Issue Date: 20-Jul-2012
Citation: Zeng, S.W., Wang, X., Lü, W.M., Huang, Z., Motapothula, M., Liu, Z.Q., Zhao, Y.L., Annadi, A., Dhar, S., Mao, H., Chen, W., Venkatesan, T., Ariando (2012-07-20). Metallic state in La-doped YBa 2Cu 3O y thin films with n-type charge carriers. Physical Review B - Condensed Matter and Materials Physics 86 (4) : -. ScholarBank@NUS Repository.
Abstract: We report hole and electron doping in La-doped YBa 2Cu 3O y (YBCO) thin films synthesized by the pulsed laser deposition technique and subsequent in situ postannealing in ambient oxygen and vaccum. The n-type samples show a metallic behavior below the Mott limit and a high carrier density of ∼2.8×1021 cm -3 at room temperature (T) at the optimally reduced condition. The in-plane resistivity(ρ ab) of the n-type samples exhibits a quadratic T dependence in the moderate-T range and shows an anomaly at a relatively higher T probably related to pseudogap formation analogous to underdoped Nd 2-xCe xCuO 4 (NCCO). Furthermore, ρ ab(T), T c, and T with minimum resistivity (T min) were investigated in both p and n sides. The present results reveal the n-p asymmetry (symmetry) within the metallic-state region in an underdoped cuprate and suggest the potential toward ambipolar superconductivity in a single YBCO system. © 2012 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.86.045124
Appears in Collections:Staff Publications

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