Experimental determination of the key energy scales in the colossal magnetoresistive manganites
- Univ. of Colorado, Boulder, CO (United States)
- Stanford Univ., CA (United States). Dept. of Applied Physics
- Univ. of Tokyo, Tsukuba, Ibaraki (Japan)
The authors have performed X-ray absorption (XAS) and angle-resolved photoemission (ARPES) on single crystals of both the layered and cubic colossal magnetoresistive manganites to determine the electronic structure and the relevant energy scales in the problem: the intra-atomic exchange energy J ({approximately} 2.7 eV), the Jahn-Teller energy gain E{sub J-T} (< .25 eV), the one-electron bandwidth W (> 3 eV for layered compounds) and the lattice relaxation or polaron binding energy E{sub B} (.65 eV ferromagnetic phase and .8 eV paramagnetic phase). Lattice polarons are deemed important especially in the paramagnetic but also to a degree in the ferromagnetic phase. Due to the energy scale mismatch, the Jahn-Teller effect is unlikely to be the cause for these lattice polarons, at least for the layered samples.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); New Energy and Industrial Technology Development Organization, Tokyo (Japan)
- OSTI ID:
- 323412
- Report Number(s):
- CONF-971201--; ISBN 1-55899-399-1
- Country of Publication:
- United States
- Language:
- English
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