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Thermodynamic Properties of Electron-doped Cuprate Superconductors

Author: WuE
Tutor: HanFuXiang
School: Dalian University of Technology
Course: Condensed Matter Physics
Keywords: Copper oxide superconducting Electron doping Slavery boson force law Order parameter t-t'-t \
CLC: TM263
Type: Master's thesis
Year: 2006
Downloads: 81
Quote: 0
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Abstract

The mechanism of high-temperature copper oxide superconductors is still cutting-edge issues in condensed matter physics . The nature of the well-known electron - doped copper oxide superconducting materials different from the hole-doped cuprate superconductors . Since in recent years , one of the electron - doped superconductor in the superconducting state and normal state of nature have done a lot of research work , and some of the results have reached a consensus , but there are still some problems there is controversy , for example : in the hole and electron doping the phase diagram of the copper oxide superconductors , the electron - doped copper oxide at the cross point of the anti - ferromagnetic state and the superconducting state is not resolved the problem . The major work of this paper is to use tt' - t - J model and slavery boson mean-field approximation method for calculating electron -doped copper oxide superconductors in the antiferromagnetic state chemical potential , entropy and electronic specific heat . Structure of the paper as follows : save the first chapter on mechanisms of high - temperature copper oxide superconductors and several common theory ; in the second chapter , a brief description of the properties of the electron - doped cuprate superconductors ; Chapter Introduction of strongly correlated systems tt'-t \Chapter tt' - t - J model and slavery boson mean-field approximation method to calculate the electron -doped cuprate superconductors in the antiferromagnetic state chemical potential , entropy and specific heat . Chemical potential the calculation results can be seen , the chemical potential and electronic doped into a linear relationship in a certain range of doping ; chemical potential and temperature into a square relationship discovered by the entropy calculation results , entropy is suppressed in the anti - ferromagnetic state phenomena; entropy as the temperature increases and decreases. can know by the calculation result of the electronic specific heat , electronic specific heat at a low temperature into a square relationship with the temperature ; also found two peaks appeared electronic specific heat at a low temperature at rendered with spin degree spin peak , while showing at high temperatures , the charge associated with the charge freedom peak with the doping degree increase of the size of the charge peak becomes small and moves to the low temperature ; spin peak size is also constantly smaller , but moving to the high temperature .

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