EFFECTIVE DIMENSIONALITY OF CUPRATE SUPERCONDUCTORS

被引：12

作者：

BOZOVIC, I

机构：

[1] Varian Research Center, Palo Alto, 94303, California

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1991年 / 4卷 / 02期

关键词：

CUPRATE SUPERCONDUCTIVITY; SLAB CARRIER CONCENTRATION; DIELECTRIC LOSS FUNCTION; TC;

D O I：

10.1007/BF00617726

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A novel optical method for accurate monitoring of the carrier density N in layered conductors is introduced. It is applied to several cuprate superconductors, and it is found that T(c) does not scale with N. However, if the closely spaced pairs or triplets of CuO2 planes were coupled together to act as distinct metallic slabs, the relevant variable could be n, the slab carrier density. Indeed, we found that T(c) does scale nicely with n. This suggests that high-T(c) superconductivity is effectively a two-dimensional phenomenon; it can occur in a cuprate slab which is only one unit cell thick. Finally, estimates are obtained for the length scales of localization of charge carriers: d almost-equal-to 8 angstrom and d perpendicular-to less-than-or-similar-to 2 angstrom in all the cuprates under study.

引用

页码：193 / 197

页数：5

共 20 条

[1] Uemura Y.J., Et al., Phys. Rev. Lett., 62, (1989)
[2] Tajima S., Nakahashi T., Uchida S., Tanaka S., Physica C, 156, (1988)
[3] Shafer M.W., Penney T., Olson B.L., Phys. Rev. B, 36, (1987)
[4] Torrance J.B., Tokura Y., Nazzal A.I., Bezinge A., Huang T.C., Parkin S.S.P., Phys. Rev. Lett., 61, (1988)
[5] Hundley M.F., Zettl A., Stacy A., Cohen M.L., Phys. Rev. B, 35, (1987)
[6] Timusk T., Tanner D.B., The Physical Properties of High-Temperature Superconductors, (1989)
[7] Bozovic I., Phys. Rev. B, 42, (1990)
[8] Bozovic I., Kim J., Lee W., Harris J.S., Optical study of plasmons inTl2Ba2Ca2Cu3O10, Physical Review B, 43, (1991)
[9] Bozovic I., Optical studies of cuprate superconductors: The nature of low-energy excitations, Physica C: Superconductivity, 162-164, (1989)
[10] Schlesinger Z., Collins R.T., Holtzberg F., Feild C., Blanton S.H., Welp U., Crabtree G.W., Fang Y., Liu J.Z., Phys. Rev. Lett., 65, (1990)

← 1 2 →