Optical studies of magnons, excitons and polarons in CuO{sub 2}-layer compounds
Conference
·
OSTI ID:538188
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
The optical properties of undoped and lightly doped lamellar copper oxides are reviewed. In the undoped materials the absorption below the charge-transfer gap is dominated by magnetic and crystal field excitations of the CuO{sub 2} layers. The temperature dependence of the charge-transfer absorption provides evidence that free charged excitations form large polarons. However, the optical ionization energy of holes bound to acceptors is much larger than the thermal ionization energy, indicating that the bound polarons are small. The parameters extracted from optical measurements predict the Hall mobility of holes in lightly doped La{sub 2}CuO{sub 4}, with no adjustable parameters, confirming that the carriers are polarons.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 538188
- Report Number(s):
- CONF-960163--; ISBN 0-8194-2070-0
- Country of Publication:
- United States
- Language:
- English
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