Physics – Condensed Matter – Superconductivity
Scientific paper
2001-09-11
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.66.064520
An improved U(1) slave-boson approach is applied to study the optical conductivity of the two dimensional systems of antiferromagnetically correlated electrons over a wide range of hole doping and temperature. Interplay between the spin and charge degrees of freedom is discussed to explain the origin of the peak-dip-hump structure in the in-plane conductivity of high $T_C$ cuprates. The role of spin fluctuations of short range order(spin singlet pair) is investigated. It is shown that the spin fluctuations of the short range order can cause the mid-infrared hump, by exhibiting a linear increase of the hump frequency with the antiferromagnetic Heisenberg coupling strength.
Eom Jae-Hyeon
Kim Ki-Seok
Lee Sung-Sik
Salk Sung-Ho Suck
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