Abstract
Samples of La1.85Sr0.15Cu1-xMxOy(M = Ni, Zn, and Mg) with a wide range of dopant concentration (0≤x≤0.30) were synthesized. X-ray diffraction analysis shows that the Zn doping results in a tetragonal-orthorhombic transition asx- >0.15. while both Ni- and Mg-doped samples still remain tetragonal up tox = 0.3. Furthermore, the Ni, Zn, and Mg dopings all reduce the local Jahn -Teller distortion of the CuO6 octahedron in a similar way. The metalinsulator transition at the region of higher doping levei (x> 0.1) is observed in all three doped systems. The observed metal-insulator transition can be well interpreted in the context of Anderson’s theory of disorder-induced localization. For most of the semiconducting-like samples with higher doping level (x> 0.1), the conductive behavior is dominated by two-dimensional variable-range-hopping (2D-VRH) with {ie-13-01} This suggests that all the dopings of Ni, Zn, and Mg in Cu sites cause the localization of the holes. In addition, a remarkable difference in the room-temperature resistivity for the heavily doped samples with the same dopant (Zn, Ni, Mg) concentrations is also observed. A possible explanation is provided for this phenomenon.
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References
Physical Properties of High-Temperature Superconductor, II. D. M. Ginsberg, ed. (World Scientific, Singapore, 1989).
S. K. Agarwal, R. Suryanarayanan, O. Gorohov, V. N. Moorthy, and A. V. Narlikar,Solid State Commun. 79, 857 (1991).
R. Ling, T. Nakamura, H. Kawaji, M. Itoh, and T. Nakamura,Physica C 170, 307 (1990).
J. Takeda, T. Nishikawa, and M. Sato,Physica C 231, 293 (1994).
H. Harashina, T. Nishikawa, T. Kiyokura, S. Shamoto, M. Sato, and K. Kakurai,Physica C,212, 142 (1993).
T. Aste, R. Eggenhoffner, and E. Galleani d’Agliano,Solid State Commun. 91, 307 (1994).
A. V. Mahajan, H. Alloul, G. Collin, and J. F. Marucco,Phys. Rev. Lett. 72, 3100 (1994).
L. Raffo, R. Caciuffo, D. Rinaldi, and F. Licci,Supercond. Sci. Technol. 8, 409 (1995).
R. Li, X. Wu, Z. Chen, Y. Qian, C. Zhu, H. Wei, S. Wang, J. Sha, and J. Xai,Phys. Leu. 144A, 35 (1990).
J. M. Tarascon, L. H. Greene, P. Barboux, W. R. Mckinnon, G. W. Hull, J. P. Orlando, K. A. Delin, S. Foner, and E. J. Mcniff,Phys. Rev. B 36, 8393 (1987).
G. Xiao, J. Q. Xiao, C. L. Chien, and Marta Z. Cieplak,Phys. Rev. B 43, 1245 (1991).
P. Mendels, and H. Alloul,Physica C 235-240, 1595–1596 (1994).
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Gaojie, X., Zhiqiang, M., Mingliang, T. et al. Two-dimensional hole localization induced by Zn, Ni, and Mg dopings in Cu sites in La1.85Sr0.15Cu1-x M x O y . J Supercond 10, 13–18 (1997). https://doi.org/10.1007/BF02763944
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DOI: https://doi.org/10.1007/BF02763944