Uranium ruthenium silicide explained

Uranium ruthenium silicide (URu₂Si₂) is a heavy fermion alloy composed of uranium, ruthenium, and silicon. URu₂Si₂ has the same '122' tetragonal crystal structure as many other compounds of present condensed matter research. URu₂Si₂ is a superconductor with a hastatic order (HO) phase below a temperature of 17.5 K.^{[1] [2]} Below this temperature, it is magnetic, and below about 1.5 K it superconducts.^[3] However, the nature of the ordered phase below 17.5K is still under debate despite a wide variety of scenarios that have been proposed to explain this phase.

Notes and References

1. H.-H. Kung1 . R. E. Baumbach . E. D. Bauer . V. K. Thorsmølle . W.-L. Zhang . K. Haule . J. A. Mydosh . G. Blumberg . Chirality density wave of the "hidden order" phase in URu2Si2 . Science . 20 March 2015 . 347 . 6228 . 1339–1342 . 10.1126/science.1259729 . 25678557 . 1410.6398 . 2015Sci...347.1339K . 30976070 .
2. Premala Chandra . Piers Coleman . Rebecca Flint . Hastatic order in the heavy-fermion compound URu2Si2 . Nature . 31 January 2013 . 493 . 7434 . 621–626 . 10.1038/nature11820 . 23364741 . 1207.4828 . 2013Natur.493..621C . 205232317 .
3. Book: Goll, Gernot . Unconventional Superconductors: Experimental Investigation of the Order-Parameter Symmetry . 107–111 . Springer. 2006 . 978-3-540-28985-2 .