(Left) Bi₂Sr₂CaCu₂O₈ single crystal disks glued to a Hall sensor chip. (Right) Nanocrystalline vortex solid imaged by magnetic decoration.

From the article:

Size-Induced Depression of First-Order Transition Lines and Entropy Jump in Extremely Layered Nanocrystalline Vortex Matter
M. I. Dolz, Y. Fasano, N. R. Cejas Bolecek, H. Pastoriza, V. Mosser, M. Li, and M. Konczykowski
Phys. Rev. Lett. 115, 137003 (2015)

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