Journal
PHYSICAL REVIEW LETTERS
Volume 91, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.91.167401
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We report on the interlayer far infrared response for a series of La2-xSrxCuO4 crystals with 0.08<0.20 focusing on the survey of the Josephson plasmon resonance (JPR). The analysis of the JPR mode provides information on the local variation of the superfluid density within the CuO2 planes thus empowering one with a tool for microscopy on the superconducting condensate. Our results uncover the presence of regions with characteristic length of similar to100-200 Angstrom within which superconductivity is strongly depressed or completely depleted. An examination of the doping trends suggests that development of superconducting inhomogeneities is triggered by the formation of the unidirectional spin density wave state in La2-xSrxCuO4 at x=1/8.
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