In-plane optical spectral weight transfer in optimally doped Bi$_{2}$Sr$_{2}$Ca$_{2}$Cu$_{3}$O$_{10}$

F. Carbone; A. B. Kuzmenko; H. J. A. Molegraaf; E. van Heumen; E. Giannini; D. van der Marel

doi:10.1103/PhysRevB.74.024502

paper

In-plane optical spectral weight transfer in optimally doped Bi $_{2}$ Sr $_{2}$ Ca $_{2}$ Cu $_{3}$ O $_{10}$

arXiv:cond-mat/0603737 · doi:10.1103/PhysRevB.74.024502

Abstract

We examine the redistribution of the in-plane optical spectral weight in the normal and superconducting state in tri-layer \bbb (Bi2223) near optimal doping ( $T_{c}$ = 110 K) on a single crystal via infrared reflectivity and spectroscopic ellipsometry. We report the temperature dependence of the low-frequency integrated spectral weight $W (Ω_{c})$ for different values of the cutoff energy $Ω_{c}$ . Two different model-independent analyses consistently show that for $Ω_{c}$ = 1 eV, which is below the charge transfer gap, $W (Ω_{c})$ increases below $T_{c}$ , implying the lowering of the kinetic energy of the holes. This is opposite to the BCS scenario, but it follows the same trend observed in the bi-layer compound \bb (Bi2212). The size of this effect is larger in Bi2223 than in Bi2212, approximately scaling with the critical temperature. In the normal state, the temperature dependence of $W (Ω_{c})$ is close to $T^{2}$ up to 300 K.

In-plane optical spectral weight transfer in optimally doped Bi2​Sr2​Ca2​Cu3​O10​

Abstract

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In-plane optical spectral weight transfer in optimally doped Bi $_{2}$ Sr $_{2}$ Ca $_{2}$ Cu $_{3}$ O $_{10}$