Recommended literature

General

• N.W. Ashcoft/Mermin: Solid State Physics
• S. Hunklinger: Festkörperphysik
• C. Kittel: Introduction to Solid State Physics
• R. Gross, A. Marx: Festkörperphysik

General - more sophisticated (but really good stuff!)

• D.I. Khomskii: Basic Aspects of the Quantum Theory of Solids: Order and Elementary Excitations (Table of contents)
• P. Fazekas: Lecture notes on electron correlation and magnetism
• J. Ziman: Principles of the theory of solids

Electronic properties and bands:

• J. Singleton: Band theory and electronic properties of solids

Superconductivity

• Buckel/Kleiner: Supraleitung (the textbook on SC)
• Annett: Supraleitung, Suprafluidität und Kondensate

Magnetism

• S. Blundell: Magnetism in Condensed Matter (good introduction)
• W. Nolting, A. Ramakanth: Quantum Theory of Magnetism (theory)
• N. Majlis: The Quantum Theory of Magnetism (theory)