Superconductivity and partial violation of spin correlation in electron stripes

Abstract

We examine the electronic state of the electron stripe which can be realized to stabilize local polarization mainly caused by the ion displacement in the c axis direction. In an undoped state, the electrons in the ground state are well localized to form a 2D electron-hole lattice with an antiferromagnetic (AF) order in the stripe direction. From the stability of the elementary excitation of the electron stripe, the lattice constant in the stripe direction, Da, is restricted as 6Å≲Da≲8Å. Upon doping carriers, when the AF state is partially violated due to the transfer (hopping) of the localized charges, the lower bound to Da tends to be reduced to around 4 Å. Given the superconductivity (SC) mediated through the interaction with the elementary excitation of the electron stripe, the optimal transition temperature Tc can be written as Tc≈c/Da5/2, where c is some structure-dependent constant. If the electron stripe exists in layered cuprates, where c is around 100K⋅(4Å)5/2, it is found that SC with Tc of order 100 K can be realized.

Source-reported materials — not catalogue approval

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