Metals, Insulators, and Superconductors

理论将发展为电子和振动 金属、绝缘体和超导体的性能，特别是 结晶氧化物，如氧化铜和氧化铋超导体 和基于钒氧化物的金属-绝缘体系统。 底层 动机是探索仍然模糊的机制， 温度超导性 研究的次要动机 是提高对多样性的理解， 这些材料的电传输特性。 为模特 系统的钡铋氧化物将进行详细研究。 电荷 该绝缘体中的载流子是双极化子。 不断进行变化 从一个奇异的超导态到一个正常的金属态 当铋被铅代替时，就会出现导体。 极化子和 将开发和测试双极化子模型以模拟电阻率， 霍尔系数和超导性。 其他模型系统 研究的是氧化铥和二氧化钒。 后者有一 金属-绝缘体转变温度， 例如存储器元件的应用。 点阵效应 畸变和声子的转变将被研究。 热 还将在非晶硅的模型中研究传导。

Theory will be developed for the electronic and vibrational properties of metals, insulators and superconductors, especially crystalline oxides such as copper-and bismuth-oxide superconductors and vanadium-oxide based metal-insulator systems. The underlying motive is to explore the still obscure mechanism for high temperature superconductivity. A secondary motive for the research is to improve understanding of the diverse and poorly understood electrical transport properties of these materials. As a model system barium-bismuth-oxide will be studied in detail. The charge carriers in this insulator are bipolarons. A continuous evolution through an exotic superconducting state to a normal metallic conductor occurs as bismuth is replaced by lead. Polaron and bipolaron models will be developed and tested to model resistivity, Hall coefficient, and superconductivity. Other model systems to be studied are niobium-oxide and vanadium-dioxide. The latter has a metal-insulator transition at a temperature convenient for device applications such as memory elements. The effect of lattice distortion and phonons on the transition will be studied. Thermal conduction will also be studied in a model of amorphous silicon.