Co-Existence of Superconductivity and Ferromagnetism in Pr Doped YBCO

ISBN-13: 9783847313229 / Angielski / Miękka / 2011 / 72 str.

Moges Tsega

Opis

The Green functions are especially useful for summing over the restricted classes of perturbation theory of diagrams, and are very powerful when combined with spectral representations. They play the most important part in the field-theoretical treatment of the many-body problem, and they are flexible enough to describe the effects of retarded interactions and all quantities of physical interest like thermodynamic properties can be derived from them. There are different types of Green functions,or propagators: One particle, two-particle,..., n particle, advanced, retarded, zero-temperature, finite-temperature, real-time, imaginary time, and so on. The Greens functions enjoy popularity because they yield, in a direct way, the most important physical properties in a systematic way. Among the types, we prefer the retarded double-time Greens function (GF) for our theoretical work because this implies the principle of causality.

O autorze

Moges Tsega has obtained his MSc in Solid State Physics in 2005.Since then he has worked in Bahir Dar University, Ethiopia for teaching undergraduate students in the field of Classical Mechanics, Statistical Physics, Electricity and Magnetism.