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Charge-transfer insulators are a class of materials predicted to be conductors following conventional band theory, but which are in fact insulators due to a charge-transfer process. Unlike in Mott insulators, where the insulating properties arise from electrons hopping between unit cells, the electrons in charge-transfer insulators move between atoms within the unit cell. In the Mott–Hubbard case, it's easier for electrons to transfer between two adjacent metal sites (on-site Coulomb interaction U); here we have an excitation corresponding to the Coulomb energy U with . .

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  • Ladungstransferisolator (de)
  • Charge-transfer insulators (en)
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  • Als Ladungstransferisolator bezeichnet man eine Klasse von Materialien die nach klassischer Bandtheorie eigentlich metallische Eigenschaften aufweisen sollten, in Realität jedoch Isolatoren (siehe Nichtleiter) sind. Im Gegensatz zu Mott-Hubbard-Isolatoren ist hier jedoch die Bandlücke nicht durch Coulomb-Wechselwirkung aufgrund des zwischen den Zuständen der Übergangsmetalle bestimmt, sondern durch die Ladungstransfer-Lücke . Diese entspricht dem Übergang eines Elektrons von einem Liganden, z. B. Sauerstoff, zum Übergangsmetall. (de)
  • Charge-transfer insulators are a class of materials predicted to be conductors following conventional band theory, but which are in fact insulators due to a charge-transfer process. Unlike in Mott insulators, where the insulating properties arise from electrons hopping between unit cells, the electrons in charge-transfer insulators move between atoms within the unit cell. In the Mott–Hubbard case, it's easier for electrons to transfer between two adjacent metal sites (on-site Coulomb interaction U); here we have an excitation corresponding to the Coulomb energy U with . . (en)
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  • Als Ladungstransferisolator bezeichnet man eine Klasse von Materialien die nach klassischer Bandtheorie eigentlich metallische Eigenschaften aufweisen sollten, in Realität jedoch Isolatoren (siehe Nichtleiter) sind. Im Gegensatz zu Mott-Hubbard-Isolatoren ist hier jedoch die Bandlücke nicht durch Coulomb-Wechselwirkung aufgrund des zwischen den Zuständen der Übergangsmetalle bestimmt, sondern durch die Ladungstransfer-Lücke . Diese entspricht dem Übergang eines Elektrons von einem Liganden, z. B. Sauerstoff, zum Übergangsmetall. Ein wichtiger Unterschied ist die Erzeugung eines p-Defektelektrons (Lochs) am Liganden. Das entspricht am Beispiel von Sauerstoff dem Übergang von „normalem“ zu ionisiertem . In diesem Fall wird das Ligandenloch oft als bezeichnet. Die Unterscheidung von Mott-Hubbard- und Ladungstransferisolatoren kann mit Hilfe des erfolgen. (de)
  • Charge-transfer insulators are a class of materials predicted to be conductors following conventional band theory, but which are in fact insulators due to a charge-transfer process. Unlike in Mott insulators, where the insulating properties arise from electrons hopping between unit cells, the electrons in charge-transfer insulators move between atoms within the unit cell. In the Mott–Hubbard case, it's easier for electrons to transfer between two adjacent metal sites (on-site Coulomb interaction U); here we have an excitation corresponding to the Coulomb energy U with . In the charge-transfer case, the excitation happens from the anion (e.g., oxygen) p level to the metal d level with the charge-transfer energy Δ: . U is determined by repulsive/exchange effects between the cation valence electrons. Δ is tuned by the chemistry between the cation and anion. One important difference is the creation of an oxygen p hole, corresponding to the change from a 'normal' to the ionic state. In this case the ligand hole is often denoted as . Distinguishing between Mott-Hubbard and charge-transfer insulators can be done using the Zaanen-Sawatzky-Allen (ZSA) scheme. (en)
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