Work function changes in the double layered manganite La1.2Sr1.8Mn2O7

Details Work function changes in the double layered manganite La1.2Sr1.8Mn2O7 Work function changes in the double layered manganite La1.2Sr1.8Mn2O7

2001-05-28

arxiv.org/abs/cond-mat/0105531v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures included in text

Scientific paper

10.1103/PhysRevB.64.134428

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.

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