The general expressions based on the Fermi distribution of the free charge carriers are applied for estimation of the transport characteristics in superconductors at the temperature well above the superconducting phas...The general expressions based on the Fermi distribution of the free charge carriers are applied for estimation of the transport characteristics in superconductors at the temperature well above the superconducting phase transition temperature TC. The Hall-effect experimental results in the normal state of the superconductor YBa2Cu3O7-δ are not finally explained. On the ground of the randomly moving charge carriers, the transport characteristics of the randomly moving charge carriers for both single type and two types of the charge carriers are presented. The particular attention has been pointed to the Hall-effect measurement results of the high-TC superconductor YBa2Cu3O7-δ. It is at the first time derived the Hall coefficient expression for two type of highly degenerate charge carriers (electrons and holes) on the ground of the randomly moving charge carriers at the Fermi surface. It is shown that the Hall coefficient and other transport characteristics are determined by the ratio between the electron-like and hole-like densities of states at the Fermi surface.展开更多
Study on the electronic structure of material surfaces is an important branch ofsolid surface physics. The scanning tunneling spectroscopy(STS) developed recentlybased on STM has shown specific advantages on the surfa...Study on the electronic structure of material surfaces is an important branch ofsolid surface physics. The scanning tunneling spectroscopy(STS) developed recentlybased on STM has shown specific advantages on the surface electronic structure re-search. The most attractive feature is that it can give spatially resolved surface densityof states in valence and conduction band of materials When combined with STM. This isvery important to studies of local electronic states around different atoms or展开更多
文摘The general expressions based on the Fermi distribution of the free charge carriers are applied for estimation of the transport characteristics in superconductors at the temperature well above the superconducting phase transition temperature TC. The Hall-effect experimental results in the normal state of the superconductor YBa2Cu3O7-δ are not finally explained. On the ground of the randomly moving charge carriers, the transport characteristics of the randomly moving charge carriers for both single type and two types of the charge carriers are presented. The particular attention has been pointed to the Hall-effect measurement results of the high-TC superconductor YBa2Cu3O7-δ. It is at the first time derived the Hall coefficient expression for two type of highly degenerate charge carriers (electrons and holes) on the ground of the randomly moving charge carriers at the Fermi surface. It is shown that the Hall coefficient and other transport characteristics are determined by the ratio between the electron-like and hole-like densities of states at the Fermi surface.
文摘Study on the electronic structure of material surfaces is an important branch ofsolid surface physics. The scanning tunneling spectroscopy(STS) developed recentlybased on STM has shown specific advantages on the surface electronic structure re-search. The most attractive feature is that it can give spatially resolved surface densityof states in valence and conduction band of materials When combined with STM. This isvery important to studies of local electronic states around different atoms or
