| Issue |
Europhys. Lett.
Volume 47, Number 6, September II 1999
|
|
|---|---|---|
| Page(s) | 715 - 721 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00449-1 | |
| Published online | 01 September 2002 | |
In-plane charge dynamics in 
: Absence of
a charge gap in the spin/charge ordered state
1
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
Received:
10
June
1999
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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