Crystal growth and in-plane optical properties of Tl$_2$Ba$_2$Ca$_{n-1}$Cu$_n$O$_x$ (n=1,2,3) superconductors

Y. C. Ma; N. L. Wang

doi:10.1103/PhysRevB.72.104518

paper

Crystal growth and in-plane optical properties of Tl $_{2}$ Ba $_{2}$ Ca $_{n - 1}$ Cu $_{n}$ O $_{x}$ (n=1,2,3) superconductors

arXiv:cond-mat/0503250 · doi:10.1103/PhysRevB.72.104518

Abstract

Single crystals of thallium-based cuprates with the general formula Tl $_{2}$ Ba $_{2}$ Ca $_{n - 1}$ Cu $_{n}$ O $_{x}$ (n=1,2,3) have been grown by the flux method. The superconducting transition temperatures determined by the ac magnetic susceptibility are 92 K, 109 K, and 119 K for n=1,2,3 respectively. X-ray diffraction measurements and EDX compositional analysis were described. We measured in-plane optical reflectance from room temperature down to 10 K, placing emphasis on Tl-2223. The reflectance roughly has a linear-frequency dependence above superconducting transition temperature, but displays a pronounced knee structure together with a dip-like feature at higher frequency below T $_{c}$ . Correspondingly, the ratio of the reflectances below and above T $_{c}$ displays a maximum and a minimum near those feature frequencies. In particular, those features in Tl2223 appear at higher energy scale than Tl2212, and Tl2201. The optical data are analyzed in terms of spectral function. We discussed the physical consequences of the data in terms of both clean and dirty limit.

8 pages, 13 figures, to be published in Phys. Rev. B

Crystal growth and in-plane optical properties of Tl $_{2}$ Ba $_{2}$ Ca $_{n - 1}$ Cu $_{n}$ O $_{x}$ (n=1,2,3) superconductors

Abstract

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Crystal growth and in-plane optical properties of Tl2​Ba2​Can−1​Cun​Ox​ (n=1,2,3) superconductors

Abstract

References in corpus (5)

Cited by in corpus (7)

Crystal growth and in-plane optical properties of Tl $_{2}$ Ba $_{2}$ Ca $_{n - 1}$ Cu $_{n}$ O $_{x}$ (n=1,2,3) superconductors