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Dulić D Pimenov A van der Marel D Broun DM Kamal S Hardy WN Tsvetkov AA Sutjaha IM Liang R Menovsky AA Loidl A Saxena SS 《Physical review letters》2001,86(18):4144-4147
We present microwave and infrared measurements on SmLa0.8Sr0.2CuO4-delta, which are direct evidence for the existence of a transverse optical plasma mode, observed as a peak in the c-axis optical conductivity. This mode appears as a consequence of the existence of two different intrinsic Josephson couplings between the CuO2 layers, one with a Sm2O2 block layer, and the other one with a (La,Sr)2O2-delta block layer. From the frequencies and the intensities of the collective modes we determine the value of the compressibility of the two dimensional electron fluid in the copper oxygen planes. 相似文献
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