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Quantum magnetism

A watched pot on a quantum stove

Experimental evidence for discontinuous behaviour of the magnetization suggests that ferromagnetic transitions at very low temperatures are different from their high-temperature brethren, for which the phase transitions are usually continuous.

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Figure 1: Phase diagrams.
Figure 2: Magnetic TP phase diagram for materials such as UGe2, ZrZn2 or MnSi.

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Belitz, D., Kirkpatrick, T. A watched pot on a quantum stove. Nature Phys 3, 15–16 (2007). https://doi.org/10.1038/nphys485

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