Low temperature thermal conductivity of bilayer lanthanum-strontium-manganite (La1.2Sr1.8Mn2O7
- Los Alamos National Laboratory
- INHA UNIV.
- LA STATE UNIV.
Thermal conductivity measurements were performed on bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} down to 0.1 K and up to 7.5 T. Due to the fact that ferromagnetic magnons can be largely gapped with a magnetic field, we could separate the magnon contribution to the thermal conductivity as well as the specific heat. Consequently, we find evidence for the transport of heat by 2-dimensional ferromagnetic magnons which are scattered by electrons. Assuming that the Wiedemann-Franz law is obeyed we find a self consistent analysis which shows a phonon thermal conductivity at low temperatures proportional to T{sup 1.7}. This is evidence that structurally glassy dynamics persist down to very low temperatures in the manganites.
- Research Organization:
- Los Alamos National Laboratory (LANL)
- Sponsoring Organization:
- DOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 960928
- Report Number(s):
- LA-UR-08-06559; LA-UR-08-6559
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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