Oxygen-isotope shift of the charge-stripe ordering temperature in La 2- x Sr x CuO 4 from x-ray absorption spectroscopy
1999; IOP Publishing; Volume: 11; Issue: 48 Linguagem: Inglês
10.1088/0953-8984/11/48/103
ISSN1361-648X
AutoresAlessandra Lanzara, Guo‐meng Zhao, N. L. Saini, A. Bianconi, K. Conder, H. Keller, K. A. Müller,
Tópico(s)Advanced Condensed Matter Physics
ResumoA very large oxygen-isotope shift of the charge-stripe ordering temperature in the high-temperature superconductors La2-xSrxCuO4 has been observed using x-ray absorption spectroscopy, a fast (~10-15 seconds) and local probe (~5 A). Upon replacing 16O with 18O, the charge-stripe ordering temperature in La1.94Sr0.06CuO4 increases from about 110 K to 180 K. The present results provide compelling evidence for a strong electron-phonon interaction in this compound, and thus place important constraints on the microscopic origin of the stripe formation.
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