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Is There a Unified Description of Conductivity of Layered Cuprates ? | | C. C. Almasan
; E. Cimpoiasu
; G. A. Levin
; H. Zheng
; A. P. Paulikas
; B. W. Veal
; | | Date: |
17 Aug 1999 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | We present a novel approach to the analysis of the normal state in-plane $sigma_{ab}$ and out-of-plane $sigma_{c}$ conductivities of anisotropic layered crystals such as oxygen deficient $YBa_{2}Cu_{3}O_{x}$. It can be shown that the resistive anisotropy is determined by the ratio of the phase coherence lengths in the respective directions; i.e., $sigma_{ab}/sigma_c=ell_{ab}^2/ell_c^2$. From the idea that at all doping levels and temperatures $T$ the out-of-plane transport in these crystals is incoherent, follows that $ell_c$ is T-independent, equal to the spacing $ell_0$ between the neighboring bilayers. Thus, the T-dependence of $ell_{ab}$ is given by the measured anisotropy, and $sigma_{ab}(ell_{ab})$ dependence is obtained by plotting $sigma_{ab}$ vs $ell=(sigma_{ab}/sigma_c)^{1/2}ell_0$. The analysis of several single crystals of $YBa_{2}Cu_{3}O_{x}$ ($6.35 | | Source: | arXiv, cond-mat/9908233 | | Services: | Forum | Review | PDF | Favorites | |
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