Question

Diamagnetic materials with negative susceptibility?

Answer 1

Alternatively, if χ is negative, the material isdiamagnetic. In this case, the magnetic field in the material is weakened by the induced magnetization. Generally, nonmagnetic materials are said to be para- or diamagnetic because they do not possess permanent magnetization without external magnetic field.

Answer 2

Landau Quantization

Landau Quantization tells us that in a magnetic field, almost everything inside an atom changes. Electrons are quantized in a whole different way, which leads to a complete new picture. This picture, explained by Landau, is used to define diamagnetism.