The Intriguing Superconductivity of Strontium Ruthenate

Maeno, Y.; Rice, T. M.; Sigrist, Manfred

doi:10.1063/1.1349611

Cited by 357 publications

(278 citation statements)

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“…It is further established that superconductivity in Sr 2 RuO 4 is made of spintriplet Cooper pairs and breaks time-reversal symmetry [2,4]. The strongest experimental argument for that can be found in the uniform susceptibility measured either by the NMR-Knight-shift or polarized neutrons experiments [5,6] and in the appearance of spontaneous fields in the superconducting state reported by µSR [7].…”

Section: Introductionmentioning

confidence: 99%

Inelastic neutron scattering study of magnetic excitations inSr2RuO4

et al. 2002

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Magnetic excitations in Sr2RuO4 have been studied by inelastic neutron scattering. The magnetic fluctuations are dominated by incommensurate peaks related to the Fermi surface nesting of the quasi-one-dimensional dxz-and dyz-bands. The shape of the incommensurate signal agrees well with RPA calculations. At the incommensurate Q-positions the energy spectrum considerably softens upon cooling pointing to a close magnetic instability : Sr2RuO4 does not exhibit quantum criticality but is very close to it. ω/T -scaling may be fitted to the data for temperatures above 30 K. Below the superconducting transition, the magnetic response at the nesting signal is not found to change in the energy range down to 0.4meV.

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Section: Introductionmentioning

confidence: 99%

Inelastic neutron scattering study of magnetic excitations inSr2RuO4

et al. 2002

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“…Numerous experiments suggest that the superconducting state of Sr 2 RuO 4 [1] is unconventional (see review [2]). Strong suppression of T c by non-magnetic impurities [3] and absence of the Hebel-Slichter peak in NMR experiments [4] indicate that it is not s-wave.…”

Section: Introductionmentioning

confidence: 99%

Edge states and determination of pairing symmetry in superconductingSr2RuO4

2002

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We calculate the energy dispersion of the surface Andreev states and their contribution to tunneling conductance for the order parameters with horizontal and vertical lines of nodes proposed for superconducting Sr2RuO4. For vertical lines, we find double peaks in tunneling spectra reflecting the van Hove singularities in the density of surface states originating from the turning points in their energy dispersion. For horizontal lines, we find a single cusp-like peak at zero bias, which agrees very well with the experimental data on tunneling in Sr2RuO4.

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“…Another type of unconventional superconductor is the layered ruthenate Sr 2 RuO 4 [6], which most likely has triplet pairing with p-wave symmetry [7]. It was proposed that the pairing in this material results from ferromagnetic (FM) spin fluctuations [8,9].…”

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Order-parameter symmetries for magnetic and superconducting instabilities: Bethe-Salpeter analysis of functional renormalization-group solutions

Катанин

Kampf

2005

Phys. Rev. B

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The Bethe-Salpeter equation is combined with the temperature-cutoff functional renormalization group approach to analyze the order parameter structure for the leading instabilities of the 2D t-t ′ Hubbard model. We find significant deviations from the conventional s-, p-, or d-wave forms, which is due to the frustration of antiferromagnetism at small and intermediate t ′ . With adding a direct antiferromagnetic spin-exchange coupling the eigenfunctions in the particle-hole channel have extended s-wave form, while in the particle-particle singlet pairing channel a higher angular momentum component arises besides the standard d x 2 −y 2 -wave component, which flattens the angular dependence of the gap. For t ′ closer to t/2 we find a delicate competition of ferromagnetism and triplet pairing with a nontrivial pair-wavefunction.PACS Numbers: 71.10.Fd; 71.27.+a;74.25.Dw It is by now well established that the superconducting order parameter in high-T c compounds is well described by a (cos k x − cos k y )-momentum dependence: it is largest at the Fermi surface (FS) points close to (π, 0) and (0, π) and vanishes at the FS crossings on the Brillouin zone (BZ) diagonals. Accurate measurements of the gap function, however, revealed a slight deviation from this d x 2 −y 2 -wave momentum dependence [1], with a flatter angular dependence near the nodal points. The symmetry and the details of the momentum dependence of the superconducting order parameter are closely related to the structure of the effective attractive interaction between the electrons. The precise momentum dependence of the energy gap therefore contains valuable information about the underlying pairing mechanism, for which antiferromagnetic (AFM) spin fluctuations are a viable candidate for cuprates [2][3][4][5].Another type of unconventional superconductor is the layered ruthenate Sr 2 RuO 4 [6], which most likely has triplet pairing with p-wave symmetry [7]. It was proposed that the pairing in this material results from ferromagnetic (FM) spin fluctuations [8,9]. Although inelastic neutron scattering has so far been unsuccessful to detect significant low-energy FM spin fluctuations [10], this idea finds support from the enhanced tendencies towards ferromagnetism in the electron doped compound Sr 2−x La x RuO 4 [11] and in isoelectronic Ca 2 RuO 4 under hydrostatic pressure [12].The important role of AFM and FM fluctuations as a possible driving source of singlet and triplet superconductivity, respectively, was emphasized early on in the pioneering work in Refs. [13][14][15]. Recently, the interplay of antiferromagnetism and d-wave superconductivity (dSC) and ferromagnetism and p-wave superconductivity (pSC), respectively, was reconsidered within the tt ′ Hubbard model using functional renormalization-group (fRG) techniques [16][17][18][19][20]. Early versions of fRG [16][17][18], which used the momentum cutoff procedure, were unable to search for ferromagnetism. This drawback is overcome in the temperature-cutoff fRG approach (TCRG) [19], which proved s...

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The Intriguing Superconductivity of Strontium Ruthenate

Abstract: Structurally, this metal oxide resembles the high-Tc cuprates, but its superconductivity is more like the superfluidity of helium-3.

Cited by 357 publications

References 20 publications

Inelastic neutron scattering study of magnetic excitations inSr2RuO4

Inelastic neutron scattering study of magnetic excitations inSr2RuO4

Edge states and determination of pairing symmetry in superconductingSr2RuO4

Order-parameter symmetries for magnetic and superconducting instabilities: Bethe-Salpeter analysis of functional renormalization-group solutions

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