Spin density for two components of a hidden order parameter -- the rank five multipole tensor w⁶¹⁵ -- in URu₂Si₂.

From the article:

Itinerant Magnetic Multipole Moments of Rank Five as the Hidden Order in ${\mathrm{URu}}_2{\mathrm{Si}}_2$
Francesco Cricchio, Fredrik Bultmark, Oscar Grånäs, and Lars Nordström
Phys. Rev. Lett. 103, 107202 (2009)

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