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

Abstract

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.

6 pages, 4 figures included in text

References in corpus (6)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Electronic Raman scattering and photoluminescence from La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ exhibiting giant magnetoresistance
• Neutron scattering investigation of magnetic bilayer correlations in $L{a}_{1.2}S{r}_{1.8}M{n}_2{O}_7$
• Temperature-Dependent Pseudogaps in Colossal Magnetoresistive Oxides
• Anomalous Shift of Chemical Potential in the Double-Exchange Systems
• Long range Coulomb forces and the behaviour of the chemical potential of electrons in metals at a second order phase transition

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• Chemical potential shift induced by double-exchange and polaronic effects in Nd_{1-x}Sr_xMnO_3