ISSN:
1572-9605
Schlagwort(e):
manganese oxides
;
high pressure
;
charge-density waves
;
magnetism
;
polarons
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Abstract The localized-itinerant and Mott–Hubbard transitions in single-valent perovskites are distinguished. The approach to the Mott–Hubbard transition from the itinerant-electron side is characterized by the appearance of strong-correlation fluctuations within a metallic matrix; these fluctuations introduce a Curie–Weiss paramagnetism that is added to a strongly enhanced Pauli paramagnetism. As the critical bandwidth is approached, ordering of the strong-correlation fluctuations into a charge-density wave (CDW) may compete with a global Mott-Hubbard transition. The approach to the localized-itinerant electronic transition from the localized-electron side is illustrated by LaMnO3, where orbital ordering localizes the electrons of e-orbital parentage. In the mixed-valent La1−x Sr x MnO3 system, the doped holes evolve from small polarons to two-manganese Zener polarons to itinerant-electron behavior. The Zener polarons order at low temperatures into a CDW.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1026462510687
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