Abstract
An analysis is made to clarify why Allan and Betts and Katsura and Horiguchi could give the correct isothermal perpendicular susceptibility of the Ising model and the XY model, respectively, with the aid of the Kubo formula and some limiting procedure. A comparison is made with the similar situation in the calculation of the two-time correlation function with the use of the two-time Green function. The discussion includes the calculation of the isothermal susceptibility for the ideal spin-wave approximation of a ferromagnet.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
