Task: Text Categorization
Input (English): This universal property of all spinless boson systems can be derived exactly for all charged scalar fields at any temperature. This property is most easily observed in symmetric electronic structures such as ionic crystals. Materials with this property do not fit into the assumptions of Earnshaws theorem, as they have negative susceptibility. Bismuth has the highest elemental value for this property, and superconductors demonstrate the perfect variety of this property when they expel magnetic fields. For ten points, identify this type of magnetism employed in a namesake type of levitation and distinguished from paramagnetism.
Output (English): Science