Local Lattice Instability and Superconductivity in La${}_{1.85}$Sr${}_{0.15}$Cu${}_{1-x}$M${}_x$O${}_4$ (M=Mn, Ni, and Co)

Abstract

Local lattice structures of La${}_{1.85}$Sr${}_{0.15}$Cu${}_{1-x}$M${}_x$O${}_4$ (M=Mn, Ni, and Co) single crystals are investigated by polarized extended x-ray absorption fine structure (EXAFS). The local lattice instability at low temperature is described by in-plane Cu-O bond splitting. We find that substitution of Mn for Cu causes little perturbation of local lattice instability while Ni and Co substitution strongly suppresses the instability. The suppression of superconductivity by Cu-site substitution is related to the perturbation of lattice instability, indicating that local lattice instability (polaron) plays an important role in superconductivity.

References in corpus (3)

• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• Charge order, metallic behavior and superconductivity in La_{2-x}Ba_xCuO_4 with x=1/8
• Nature of the Magnetic Order in the Charge-Ordered Cuprate La${}_{1.48}$Nd${}_{0.4}$Sr${}_{0.12}$CuO${}_4$

Cited by in corpus (4)

• Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9
• Kuramoto synchronization of quantum tunneling polarons for describing the dynamic structure in cuprate superconductors
• d-Wave Pairing Driven by Bipolaric Modes Related to Giant Electron-Phonon Anomalies in High-$T_c$ Superconductors
• Record high superconducting transition temperature in Ti${}_{1-x}$Mn${}_x$ alloy with rich magnetic element Mn