Foundations of heavy-fermion superconductivity: lattice Kondo effect and Mott physics
- 4 July 2016
- journal article
- research article
- Published by IOP Publishing in Reports on Progress in Physics
- Vol. 79 (8), 084502
- https://doi.org/10.1088/0034-4885/79/8/084502
Abstract
This article overviews the development of heavy-fermion superconductivity, notably in such rare-earth-based intermetallic compounds which behave as Kondo-lattice systems. Heavy-fermion superconductivity is of unconventional nature in the sense that it is not mediated by electron-phonon coupling. Rather, in most cases the attractive interaction between charge carriers is apparently magnetic in origin. Fluctuations associated with an antiferromagnetic (AF) quantum critical point (QCP) play a major role. The first heavy-fermion superconductor CeCu2Si2 turned out to be the prototype of a larger group of materials for which the underlying, often pressure-induced, AF QCP is likely to be of a three-dimensional (3D) spin-density-wave (SDW) variety. For UBe13, the second heavy-fermion superconductor, a magnetic-field-induced 3D SDW QCP inside the superconducting phase can be conjectured. Such a 'conventional', itinerant QCP can be well understood within Landau's paradigm of order-parameter fluctuations. In contrast, the low-temperature normal-state properties of a few heavy-fermion superconductors are at odds with the Landau framework. They are characterized by an 'unconventional', local QCP which may be considered a zero-temperature 4 f-orbital selective Mott transition. Here, as concluded for YbRh2Si2, the breakdown of the Kondo effect concurring with the AF instability gives rise to an abrupt change of the Fermi surface. Very recently, superconductivity was discovered for this compound at ultra-low temperatures. Therefore, YbRh2Si2 along with CeRhIn5 under pressure provide a natural link between the large group of about fifty low-temperature heavy-fermion superconductors and other families of unconventional superconductors with substantially higher T c, e.g. the doped Mott insulators of the perovskite-type cuprates and the organic charge-transfer salts.Keywords
Funding Information
- Deutsche Forschungsgesellschaft (Research Unit 960)
This publication has 100 references indexed in Scilit:
- Destruction of the Kondo effect in the cubic heavy-fermion compound Ce3Pd20Si6Nature Materials, 2012
- Fermi-surface collapse and dynamical scaling near a quantum-critical pointProceedings of the National Academy of Sciences of the United States of America, 2010
- Signatures of quantum criticality in pure Cr at high pressureProceedings of the National Academy of Sciences of the United States of America, 2010
- Visualizing the formation of the Kondo lattice and the hidden order in URu 2 Si 2Proceedings of the National Academy of Sciences of the United States of America, 2010
- Magnetism and superconductivity driven by identical 4 f states in a heavy-fermion metalProceedings of the National Academy of Sciences of the United States of America, 2010
- Heavy holes as a precursor to superconductivity in antiferromagnetic CeIn 3Proceedings of the National Academy of Sciences of the United States of America, 2009
- Non-Fermi liquid normal state of the heavy-fermion superconductor UBe13Physica C: Superconductivity and its Applications, 2004
- Unconventional heavy-fermion superconductordc magnetization study at temperatures down to 50 mKPhysical Review B, 2002
- Superconductivity and magnetic order in a strongly interacting fermi-system: URu2Si2Zeitschrift für Physik B Condensed Matter, 1986
- Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13Zeitschrift für Physik B Condensed Matter, 1986