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Interlayer Josephson couplings in Hg-based multi-layered cuprates

Hirata, Yasuyuki*; Kojima, Kenji*; Uchida, Shinichi*; Ishikado, Motoyuki; Iyo, Akira*; Eisaki, Hiroshi*; Tajima, Setsuko*

Infrared reflectivity spectra of the multilayered HgBa$$_{2}$$Ca$$_{n-1}$$Cu$$_{n}$$O$$_{2n+2+delta}$$ (${it n}$ = 2, 3, 4, and 5) are measured. Optical plasma modes associated with the Josephson coupling between CuO$$_{2}$$ planes within a multilayer appear below $$T$$$$_{rm c}$$ in the c-axis component of the reflectivity spectrum. For the bilayer and trilayer compound an optical Josephson plasma mode appears at unprecedentedly high frequency, $$sim$$ 700-800 cm$$^{-1}$$, below $$T$$$$_{rm c}$$. The plasma frequencies appreciably decrease in four- and five-layer compounds which indicates the suppression of superconducting order in the inner CuO$$_{2}$$ planes, consistent with the result of NMR experiment.

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Category:Physics, Applied

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