COMPARISON OF THE HIGH-FREQUENCY MAGNETIC FLUCTUATIONS IN INSULATING AND SUPERCONDUCTING LA2-XSRXCUO4

Authors
HAYDEN SM AEPPLI G MOOK HA PERRING TG MASON TE CHEONG SW FISK Z
Citation
Sm. Hayden et al., COMPARISON OF THE HIGH-FREQUENCY MAGNETIC FLUCTUATIONS IN INSULATING AND SUPERCONDUCTING LA2-XSRXCUO4, Physical review letters, 76(8), 1996, pp. 1344-1347
Citations number
33
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
76
Issue
8
Year of publication
1996
Pages
1344 - 1347
Database
ISI
SICI code
0031-9007(1996)76:8<1344:COTHMF>2.0.ZU;2-9
Abstract
Inelastic neutron scattering performed at a spallation source is used to make absolute measurements of the dynamic susceptibility of insulat ing La2CuO4 and superconducting La1.86Sr0.14CuO4 over the energy range 15 less than or equal to (h) over bar omega less than or equal to 350 meV. The effect of Sr doping on the magnetic excitations is to cause a large broadening in the wave vector and a substantial change in the spectrum of the local spin fluctuations. Comparison of the two composi tions reveals a new energy scale (h) over bar Gamma = 22 +/- 5 meV in La1.86Sr0.14CuO4.