Emergence of superconductivity in the canonical heavy-electron metal YbRh2Si2

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Science  29 Jan 2016:
Vol. 351, Issue 6272, pp. 485-488
DOI: 10.1126/science.aaa9733

Going to extremes to find superconductivity

Quantum phase transitions (QPTs) occur at zero temperature when parameters such as magnetic field or pressure are varied. In heavy fermion compounds, superconductivity often accompanies QPTs, a seeming exception being the material YbRh2Si2, which undergoes a magnetic QPT. Schuberth et al. performed magnetic and calorimetric measurements at extremely low temperatures and magnetic fields and found that it does become superconducting after all. Almost simultaneously with superconductivity, another order appeared that showed signatures of nuclear spin origin.

Science, this issue p. 485

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