In-plane charge dynamics in La 1.6 − x Nd 0.4 Sr x CuO 4 : Absence of a charge gap in the spin/charge ordered state
- 15 September 1999
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 47 (6) , 715-721
- https://doi.org/10.1209/epl/i1999-00449-1
Abstract
We have investigated the optical conductivity of the spin/charge "stripe" order phase in La1.6 − xNd0.4SrxCuO4 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 8000 cm−1. 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.Keywords
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