Volume 47, Number 6, September II 1999
|Page(s)||715 - 721|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
In-plane charge dynamics in : Absence of a charge gap in the spin/charge ordered state
Superconductivity Research Laboratory, ISTEC - Tokyo 135-0062, Japan
2 Department of Applied Physics, The University of Tokyo - Tokyo 113-8656, Japan
3 Department of Basic Science, The University of Tokyo - Tokyo 153-0041, Japan
Accepted: 13 July 1999
We have investigated the optical conductivity of the spin/charge "stripe” order phase in in the microwave and the infrared regions. The in-plane conductivity is appreciably suppressed with respect to the spectrum for the Nd-free crystal over a wide frequency range of up to . The suppression persists even at room temperature, indicating a strong fluctuation of this order. Nevertheless, the spectrum is basically metallic without showing a gap associated with charge order. It was found that the magnetic penetration depth is extremely long in the superconducting state which coexists with the static spin/charge order.
PACS: 74.25.Gz – Optical properties / 74.72.Dn – La-based cuprates / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 1999
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