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| Sr2RuO4 | |
|---|---|
| Name | Sr2RuO4 |
| Category | Oxide superconductor |
| Formula | Sr2RuO4 |
| Crystal system | Tetragonal (K2NiF4-type) |
| Space group | I4/mmm |
| Tc | ~1.5 K |
Sr2RuO4 Sr2RuO4 is a layered perovskite oxide known for unconventional superconductivity discovered in the late 20th century; it sparked extensive research linking solid-state experiments with theoretical models developed by figures associated with Nobel Prize in Physics, John Bardeen, Leon Cooper, Robert Schrieffer, Alexei Abrikosov, and institutions such as Bell Labs, IBM Research, and University of Cambridge, and it motivated comparisons with correlated materials studied at Los Alamos National Laboratory, Max Planck Society, Stanford University, Harvard University, and Massachusetts Institute of Technology.
Sr2RuO4 was first identified as a correlated oxide material by groups influenced by work at University of Tokyo, Oak Ridge National Laboratory, Argonne National Laboratory, and Columbia University; early transport and thermodynamic characterization involved collaborations comparable to those at Cavendish Laboratory, Paul Scherrer Institute, and ETH Zurich. The compound's layered structure and low superconducting critical temperature attracted attention from researchers associated with Ginzburg, Anderson, Abrikosov, Leggett, and led to experimental campaigns using tools developed at European Synchrotron Radiation Facility, Brookhaven National Laboratory, National Institute of Standards and Technology, and Rutherford Appleton Laboratory.
The crystal lattice of Sr2RuO4 adopts the K2NiF4-type tetragonal structure familiar from studies at University of Oxford, Princeton University, Yale University, and University of California, Berkeley; early crystallography benefited from methods advanced at Royal Society, Max Planck Institute for Solid State Research, and Institut Laue–Langevin. The electronic structure comprises three quasi-two-dimensional Fermi surface sheets derived from Ru 4d t2g orbitals, a detail elucidated by angle-resolved photoemission spectroscopy pioneered at SLAC National Accelerator Laboratory, Soleil, and DESY, and by band-structure calculations influenced by methods from Density Functional Theory developers associated with Walter Kohn and groups at IBM Research. The multi-band character links Sr2RuO4 to research on cuprate superconductors at Bell Labs, University of Geneva, and Los Alamos National Laboratory, while spin-orbit coupling effects echo studies by groups at University of Chicago and Columbia University.
In the normal state Sr2RuO4 exhibits Fermi-liquid behavior at low temperatures similar to observations in heavy-fermion compounds investigated at Los Alamos National Laboratory and University of California, Irvine, and shows resistivity, specific heat, and magnetic susceptibility signatures measured with apparatus from National High Magnetic Field Laboratory and NIST. Quantum oscillation experiments tracing de Haas–van Alphen signals used techniques refined at ETH Zurich and MPI CPfS and revealed effective masses consistent with correlated metals studied by groups at Cambridge University Press-linked institutions. The compound's proximity to magnetic instabilities connects it to research on ferromagnetic and antiferromagnetic fluctuations explored at Argonne National Laboratory and ISIS Neutron and Muon Source.
The superconducting state of Sr2RuO4 has been central to debates over unconventional pairing, with proposals ranging from spin-triplet chiral p-wave states advocated by theorists in the tradition of Anderson, Balian-Werthamer, and Sigrist to singlet and multi-component scenarios inspired by work at Princeton University and University of Chicago. Experiments invoking the Knight shift by NMR groups at RIKEN, University of California, San Diego, and University of Birmingham and muon spin relaxation studies from teams at TRIUMF and Paul Scherrer Institute produced contrasting signals that generated international efforts involving Columbia University, UCL, and Kyoto University. The issue touches on topology and edge currents in superconductors, themes prominent in research at Microsoft Station Q, Perimeter Institute, and Institute for Advanced Study.
Key measurements include angle-resolved photoemission spectroscopy at facilities like Stanford Synchrotron Radiation Lightsource and MAX IV, scanning tunneling microscopy from groups at University of Illinois Urbana–Champaign and Cornell University, thermal conductivity and specific heat by teams associated with Los Alamos National Laboratory and University of Tokyo, and NMR and muSR performed by researchers connected to RIKEN, TRIUMF, and Paul Scherrer Institute. Precision strain experiments executed in laboratories at Harvard University and MIT altered Tc and revealed sensitivity to lattice symmetry, paralleling strain studies on iron-based superconductors at IFW Dresden and University of Twente. Neutron scattering and inelastic spectroscopy at ISIS and ILL probed spin fluctuations analogous to experiments on UPt3 and CeCoIn5 done at Oak Ridge National Laboratory.
Theoretical frameworks for Sr2RuO4 span weak-coupling treatments, functional renormalization group analyses influenced by work at University of British Columbia and University of Cambridge, and strong-coupling approaches related to dynamical mean-field theory developed at Rutgers University and Max Planck Institute for Chemical Physics of Solids. Models incorporate multi-orbital Hubbard interactions, spin-orbit coupling, and nematic tendencies, referencing techniques used by theorists affiliated with Princeton University, Perimeter Institute, Caltech, and Institut des Hautes Études Scientifiques. Competing mechanisms—spin-fluctuation-mediated pairing versus orbital- or phonon-driven channels—reflect debates similar to those about pairing in SrTiO3 and iron pnictides, studied broadly across University of Tokyo, University of Science and Technology of China, and Iowa State University.
Chemical substitutions and related Ruddlesden–Popper phases were explored in contexts comparable to substitutional studies on La2−xSrxCuO4 at Bell Labs and University of Geneva, and investigations into Ca-substituted analogues used techniques from Oak Ridge National Laboratory and Argonne National Laboratory. Proximate materials include layered ruthenates such as Sr3Ru2O7 and Ca2RuO4, with comparative studies conducted by groups at Max Planck Institute for Solid State Research, University of St Andrews, and Tohoku University; these comparisons tie into broader oxide research themes pursued at University of California, Los Angeles and University of Minnesota.
Category:Oxide superconductors