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Work function changes in the double layered manganite La1.2Sr1.8Mn2O7 by Schulte, K.; James, M. A.; Tjeng, L. H.; Steeneken, P. G.; Sawatzky, G. A.; Suryanarayanan, R.; Dhalenne, G.; Revcolevschi, A. is a scholarly article available to read on EtoBox.

What is Work function changes in the double layered manganite La1.2Sr1.8Mn2O7 about?

We have investigated the behaviour of the work function of La1.2Sr1.8Mn2O7 as a function of temperature by means of photoemission. We found a decrease of 55 +/- 10 meV in going from 60 K to just above the Curie temperature (125 K) of the sample. Above T_C the work function appears to be roughly constant. Our results are exactly opposite to the work function changes calculated from the double-exchange model by Furukawa, but are consistent with other measurements. The disagreement with double-exchange can be explained using a general thermodynamic relation valid for second order transitions and including the extra processes involved in the manganites besides double-exchange interaction.

Author

Schulte, K.; James, M. A.; Tjeng, L. H.; Steeneken, P. G.; Sawatzky, G. A.; Suryanarayanan, R.; Dhalenne, G.; Revcolevschi, A.

Published

2001

Language

EN