Pseudogap behavior of nuclear spin relaxation in high Tc superconductors in terms of phase separation

Abstract

We analyze anew experiments on the NMR in cuprates and find an important information on their phase separation and its stripe character hidden in the dependence of $1{/}^{63}{T}_1$ on degree of doping. In a broad class of materials $1{/}^{63}{T}_1$ is the sum of two terms: the temperature independent one attributed to ``incommensurate'' stripes that occur at external doping, and an ``universal'' temperature dependent term ascribed to moving metallic and AF sub-phases. We argue that the frustrated first order phase transition in a broad temperature interval bears a dynamical character.

arXiv comment5 pages, 3 figures; some comments and references added; accepted for publication in JETP Letters

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• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Universal Behavior and the Two-component Character of Magnetically Underdoped Cuprate Superconductors
• Phenomenological model of protected behavior in the cuprate superconductors
• Central peak in the pseudogap of high T_c superconductors