Phases, phase transitions and spin dynamics in strongly correlated electron systems, from antiferromagnets to HTC superconductors: NMR-NQR insights
Phase transitions (PT) are typical collective phenomena occurring in many-body systems with interparticle interactions. A rather general description of the PT’s and of the accompanying “critical dynamics” can be given in the framework of Landau-type statistical theory, which includes more specific theories such as the Weiss mean field theory for magnetic systems and the Van der Waals theory for fluids. This approach is suited for second order or slightly first-order PT3.
KeywordsNuclear Magnetic Resonance Relaxation Rate Correlation Length Percolation Threshold Spin Dynamic
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