Origin of superconductivity suppression in (Dy1-xPrx)Ba2Cu3O7 studied by soft-x-ray absorption spectroscopy
Journal
Physical Review B
Journal Volume
55
Journal Issue
21
Pages
14586-14591
Date Issued
1997
Author(s)
Abstract
O K-edge and Cu (Formula presented)-edge x-ray-absorption near-edge structure (XANES) spectra for the series of ((Formula presented)(Formula presented))(Formula presented)(Formula presented)(Formula presented) compounds (x=0-0.7) were measured to investigate how the variation of hole states related to the superconductivity. Near the O 1s edge, prepeaks at ∼527.6 and ∼528.4 eV are assigned to transitions into O 2p holes located in the (Formula presented) ribbons and (Formula presented) planes, respectively. Both the O 2p hole concentration in the (Formula presented) planes and (Formula presented) ribbons decrease monotonically with increasing Pr doping, giving evidence in support of the hole depletion model proposed by Liechtenstein and Mazin. It clearly demonstrates that the suppression of superconductivity with Pr-doping results predominantly from the hole depletion effect. In the Cu 2p absorption edge, the high-energy shoulders originating from Cu (Formula presented)L defected states show a linear decrease in spectral weight as the Pr doping increases, where L denotes the ligand O 2p hole on the (Formula presented) ribbons and the (Formula presented) planes. © 1997 The American Physical Society.
Type
journal article