Frequency evolution of neutron peaks below Commensurate and incommensurate structure in and
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
61
Journal Issue
18
Pages
R11898-R11901
Date Issued
2000
Author(s)
Si, Q.
Abstract
We study the evolution of the neutron cross section with variable frequency (Formula presented) and fixed T below (Formula presented) in two different cuprate families. Our calculations, which predominantly probe the role of d-wave pairing, lead to generic features, independent of Fermi-surface shapes. Among our findings, reasonably consistent with experiment, are (i) for (Formula presented) near the gap energy (Formula presented) both optimal (Formula presented) and slightly underdoped (Formula presented) exhibit (comparably) incommensurate peaks, (ii) peak sharpening below (Formula presented) is seen in LaSrCuO, and (iii) quite generically, a frequency evolution from incommensurate to commensurate and then back to incommensurate structure is found with increasing (Formula presented) Due to their narrow (Formula presented) regime of stability, commensurate peaks in LaSrCuO should be extremely difficult to observe. © 2000 The American Physical Society.
Type
journal article