We have performed several experiments to explore the role of local lattice in the cuprate superconductors. The Cu K-edge X-ray absorption fine structure (EXAFS) results provide a direct evidence for the Jahn-Teller polaronic distortions of the CuO2 lattice in these materials. The Jahn-Teller polarons in the cuprates are found to be associated with Q(2) mode which is degenerate with the Q(3) Jahn-Teller mode. It is discussed that the Jahn-Teller polarons get ordered in the stripes. The temperature dependent Cu K-edge X-ray absorption near edge structure (XANES) measurements reveal a particular change in the local lattice at the charge stripe ordering temperature in different superconducting cuprate systems. This response of the local lattice to the stripe charge ordering has been used to study oxygen isotope effect (O-16-->O-18) in the La1.94Sr0.06CuO4 superconducting system. The results show that the isotope substitution introduces a large increase to the onset temperature of the charge-stripe ordering by similar to 60K, providing a compelling evidence for the vital role of the electron-lattice interactions to be an important ingredient for the charge-stripe ordering in the high T-c cuprate superconductors.

Local Structure and Stripes in the Cuprate Superconductors / Saini, Naurang Lal; Bianconi, Antonio. - STAMPA. - 4058:(2000), pp. 41-50. (Intervento presentato al convegno Superconducting and Related Oxides: Physics and Nanoengineering IV) [10.1117/12.397865].

Local Structure and Stripes in the Cuprate Superconductors

SAINI, Naurang Lal;BIANCONI, Antonio
2000

Abstract

We have performed several experiments to explore the role of local lattice in the cuprate superconductors. The Cu K-edge X-ray absorption fine structure (EXAFS) results provide a direct evidence for the Jahn-Teller polaronic distortions of the CuO2 lattice in these materials. The Jahn-Teller polarons in the cuprates are found to be associated with Q(2) mode which is degenerate with the Q(3) Jahn-Teller mode. It is discussed that the Jahn-Teller polarons get ordered in the stripes. The temperature dependent Cu K-edge X-ray absorption near edge structure (XANES) measurements reveal a particular change in the local lattice at the charge stripe ordering temperature in different superconducting cuprate systems. This response of the local lattice to the stripe charge ordering has been used to study oxygen isotope effect (O-16-->O-18) in the La1.94Sr0.06CuO4 superconducting system. The results show that the isotope substitution introduces a large increase to the onset temperature of the charge-stripe ordering by similar to 60K, providing a compelling evidence for the vital role of the electron-lattice interactions to be an important ingredient for the charge-stripe ordering in the high T-c cuprate superconductors.
2000
0819436844
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/208794
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact