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. (Wikipedia).
Capacitors (1 of 9) What is a Capacitor, An Explanation
This video explains what a capacitor is, how charge and energy are stored in a capacitor and how to calculate the capacitance of a capacitor.. A capacitor is a passive electronic device that stores electric charge on its plates and electrical energy in its electric field. A capacitor conta
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From playlist Capacitors and Capacitance
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This video describes how to graphically determine the capacitance of a capacitor. First, five data points are collected, each data point consists of the potential difference across the capacitor and the charge on the plates of the capacitor. Next the data points are plotted on a graph of
From playlist Capacitors and Capacitance
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Three example problems about how to calculate the work done by the battery and the amount of energy stored in a capacitor. A capacitor is a passive electronic device that stores electric charge on its plates and electrical energy in its electric field. A capacitor contains at least two ele
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Tutorial - Microscopic Origin of couplings between spins in Mott... (Tutorial 1) by Karlo Penc
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