Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr$_{14}$Cu$_{24}$O$_{41}$

Details Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr$_{14}$Cu$_{24}$O$_{41}$ Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr$_{14}$Cu$_{24}$O$_{41}$

2001-08-14

arxiv.org/abs/cond-mat/0108222v1

Europhysics Letters, vol.56, 434 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figure, to be published in Europhysics Letters

Scientific paper

10.1209/epl/i2001-00537-2

We have measured the temperature- and frequency dependence of the microwave and millimeter wave conductivity $\sigma_1(T,\omega)$ along both the ladder (c-axis) and the leg (a-axis) directions in Sr$_{14}$Cu$_{24}$O$_{41}$. Below a temperature $T^*$($\sim$170 K), we observed a stronger frequency dependence in $\sigma_1^c(T,\omega)$ than that in $\sigma_1^a(T,\omega)$, forming a small resonance peak developed between 30 GHz and 100 GHz. We also observed nonlinear dc conduction along the c-axis at rather low electric fields below $T^*$. These results suggest some collective excitation contributes to the c-axis charge dynamics of the slightly hole-doped ladders of Sr$_{14}$Cu$_{24}$O$_{41}$ below $T^*$.

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