Emergence of superconductivity in the canonical heavy-electron metal YbRh2Si2

• Autores: Erwin Schuberth, Marc Tippmann, Lucia Steinke, Stefan Lausberg
• Localización: Science, ISSN 0036-8075, Vol. 351, Nº 6272, 2016, págs. 485-488
• Idioma: inglés
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• Resumen

  • The smooth disappearance of antiferromagnetic order in strongly correlated metals commonly furnishes the development of unconventional superconductivity. The canonical heavy-electron compound YbRh2Si2 seems to represent an apparent exception from this quantum critical paradigm in that it is not a superconductor at temperature T ≥ 10 millikelvin (mK). Here we report magnetic and calorimetric measurements on YbRh2Si2, down to temperatures as low as T ≈ 1 mK. The data reveal the development of nuclear antiferromagnetic order slightly above 2 mK and of heavy-electron superconductivity almost concomitantly with this order. Our results demonstrate that superconductivity in the vicinity of quantum criticality is a general phenomenon.