首页|Spin fluctuations and orbital-selective superconductivity in Ba2CuO4-y:A FLEX study
Spin fluctuations and orbital-selective superconductivity in Ba2CuO4-y:A FLEX study
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Spin fluctuations and orbital-selective superconductivity in Ba2CuO4-y:A FLEX study
Recently discovered Ba2CuO4-y provides new perspectives to the study of high-temperature superconductivity.Whereas,little is known about the spin dynamics of this material.In this work,we employ the fluctuation exchange(FLEX)approximation within the framework of spin-fluctuation mediated superconductivity to examine the behavior of the spin fluctuations of a two-orbital Hubbard model for Ba2CuO4-y.Our calculations reveal an extraordinary spin resonance mode coupled to the superconducting state in the hole-underdoped regime.Furthermore,we confirm that the coupling between the electrons and this resonance mode can lead to a dip-like feature in the electronic spectrum as a feedback effect.In the hole-overdoped regime,by incorporating self energy into our calculations,we obtain orbital-dependent renormalizations and show how these self-energy effects can lead to the detailed gap structures and the orbital-selective superconductivity,which could not be obtained in a previous study using random phase approximation(RPA).This research may shed new light on searching for unconventional superconductors with higher transition temperatures.
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