Abstract
It is conjectured that in underdoped cuprate high-Tc superconductors in the pseudogap state at T⩽T*(psh) the transition of the CuO2 plane to metallic behavior with decreasing temperature is due to quantum diffusion, which was predicted for “defectons” by A. F. Andreev and I. M. Lifshitz in 1969. It is shown that the features of the pseudogap state are determined solely by the properties of the CuO2 plane and the doping concentration psh. When the temperature is decreased to T⩽TAL(psh), the joint magnetic phase diagram of states has a universal line TAL(psh)=815psh of transition of the CuO2 plane to a 2D vortex metal state with mobile charge carriers—2D vortices, which are compatible with antiferromagnetism of the CuO2 plane. A phase diagram of states, with the line TAL(psh)⩽T*(psh), is constructed for the underdoped single crystal YBaCu3Oy; it agrees with the known experimental data for other underdoped cuprate HTSCs.
Published Version
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