title: Emergence of superconductivity in the canonical heavy-electron metal YbRh₂Si₂.
abstract: 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.
authors.affiliation: Walther Meissner Institut für Tieftemperaturforschung der Bayerischen Akademie der Wissenschaften, 85748 Garching, Germany. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany. steglich@cpfs.mpg.de eschuber@ph.tum.de qmsi@rice.edu.
authors.forename: Erwin
authors.initials: E
authors.lastname: Schuberth
authors.affiliation: Walther Meissner Institut für Tieftemperaturforschung der Bayerischen Akademie der Wissenschaften, 85748 Garching, Germany. Physikdepartment, Technische Universität München, 80333 München, Germany.
authors.forename: Marc
authors.initials: M
authors.lastname: Tippmann
authors.affiliation: Walther Meissner Institut für Tieftemperaturforschung der Bayerischen Akademie der Wissenschaften, 85748 Garching, Germany. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Lucia
authors.initials: L
authors.lastname: Steinke
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Lausberg
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Steppke
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Brando
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany. Physics Institute, University of Frankfurt, 60438 Frankfurt, Germany.
authors.forename: Cornelius
authors.initials: C
authors.lastname: Krellner
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Geibel
authors.affiliation: Department of Physics, Renmin University of China, Beijing 100872, China. Department of Physics and Astronomy, Collaborative Innovation Center of Advanced Microstructures, Shanghai Jiaotong University, Shanghai 200240, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Yu
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA. steglich@cpfs.mpg.de eschuber@ph.tum.de qmsi@rice.edu.
authors.forename: Qimiao
authors.initials: Q
authors.lastname: Si
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany. Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang 310058, China. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. steglich@cpfs.mpg.de eschuber@ph.tum.de qmsi@rice.edu.
authors.forename: Frank
authors.initials: F
authors.lastname: Steglich