Structures and incommensurate spin excitations in excess oxygen-doped La{sub 2}CuO{sub 4+y}
Conference
·
OSTI ID:442179
- Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Physics; and others
Over the past decade, we have studied in detail the low energy spin fluctuations in La{sub 2-x}Sr{sub x}CuO{sub 4} for x between 0 and 0.18. Our experiments, as well as those by others, have revealed a fascinating interplay between the hole doping, the static and dynamic spin fluctuations and the superconductivity. Recently, using electrochemical techniques, we have learned how to produce large single crystals of La{sub 2}CuO{sub 4+y} which are relatively homogenous. In this latter system, the dopants are characterized by annealed rather than quenched disorder. Furthermore, we have demonstrated staging behavior of the excess oxygen analogous to staging in intercalated graphite. We have now succeeded in carrying out measurements of the low energy spin fluctuations in stage-6 La{sub 2}CuO{sub 4+y}. Specifically, we find that in this system which has T{sub c} = 31 K, the spin fluctuations are incommensurate with energy and temperature dependencies very much like those in La{sub 1.85}Sr{sub 0.15}CuO{sub 4} with T{sub c} = 33 K. In addition, we find that T{sub c}/{delta} is a constant for high quality materials in both La{sub 2-x}Sr{sub x}CuO{sub 4} and La{sub 2}CuO{sub 4+y} here 6 is the incommensurability.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); US-Japan Cooperative Neutron Scattering Program
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 442179
- Report Number(s):
- BNL--63842; CONF-9609315--1; ON: DE97002902; CNN: NSF Grant DMR 93-15714; NSF Grant 94-00334
- Country of Publication:
- United States
- Language:
- English
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