Volume 56, Number 3, November 2001
|Page(s)||434 - 440|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr14Cu24O41
Department of Basic Science, The University of Tokyo
Meguro-ku, Tokyo 153-8902, Japan
2 Department of Advanced Materials Science, The University of Tokyo Bunkyo-ku, Tokyo 113-8656, Japan
3 CREST, Japan Science and Technology Corporation (JST) Kawaguchi 332-0012, Japan
Accepted: 3 August 2001
We have measured the temperature and frequency dependence of the microwave and millimeter wave conductivity along both the ladder (c-axis) and the leg (a-axis) directions in Sr14Cu24O41. Below a temperature T* (), we observed a stronger frequency dependence in than that in , 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 Sr14Cu24O41 below T*.
PACS: 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.72.Jt – Other cuprates
© EDP Sciences, 2001
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