Vortices with half magnetic flux quanta in ‘‘heavy-fermion’’ superconductors

Geshkenbeǐn, V. B.; Larkin, A. I.; Barone, A.

doi:10.1103/physrevb.36.235

Cited by 259 publications

(152 citation statements)

References 13 publications

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“…11 To date, no such experiments have been reported for Sr 2 RuO 4 ; until they are done, one cannot say that the identification of the symmetry is totally unambiguous. Josephson tunneling of pairs between Sr 2 RuO 4 and conventional superconductors has been reported 12 -a hopeful sign that phase-sensitive experiments of this kind on Sr 2 RuO 4 will prove possible.…”

Section: Phase-sensitive Probesmentioning

confidence: 99%

The Intriguing Superconductivity of Strontium Ruthenate

2001

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Section: Phase-sensitive Probesmentioning

confidence: 99%

The Intriguing Superconductivity of Strontium Ruthenate

2001

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“…The basic principle had been designed long ago by Geshkenbein and co-workers 26 . One of the problems lies in the Josephson junctions between a conventional spin-singlet s-wave superconductor and a spin-triplet p-wave superconductor.…”

Section: Introductionmentioning

confidence: 99%

Josephson interferometer in a ring topology as a proof of the symmetry ofSr2RuO4

et al. 2005

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The Josephson effect is theoretically studied in two types of SQUIDs consisting of s wave superconductor and Sr2RuO4. Results show various response of the critical Josephson current to applied magnetic fields depending on the type of SQUID and on the pairing symmetries. In the case of a px + ipy wave symmetry, the critical current in a corner SQUID becomes an asymmetric function of magnetic fields near the critical temperatures. Our results well explain a recent experimental finding [Nelson et. al, Science 306, 1151]. We also discuss effects of chiral domains on the critical current.

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“…Superconducting π-rings have an intrinsic phase shift of π in the absence of an externally applied field or supercurrent. 5,6,7 Such rings have a doubly degenerate ground state in zero applied flux, should not have this source of disorder, and may therefore be a more ideal model for a spin system. However, use of π-rings for a model spin system requires a large number of rings.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic ordering in arrays of superconductingπ-rings

et al. 2005

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We report experiments in which one dimensional (1D) and two dimensional (2D) arrays of YBa2Cu3O 7−δ -Nb π-rings are cooled through the superconducting transition temperature of the Nb in various magnetic fields. These π-rings have degenerate ground states with either clockwise or counter-clockwise spontaneous circulating supercurrents. The final flux state of each ring in the arrays was determined using scanning SQUID microscopy. In the 1D arrays, fabricated as a single junction with facets alternating between alignment parallel to a [100] axis of the YBCO and rotated 90 o to that axis, half-fluxon Josephson vortices order strongly into an arrangement with alternating signs of their magnetic flux. We demonstrate that this ordering is driven by phase coupling and model the cooling process with a numerical solution of the Sine-Gordon equation. The 2D ring arrays couple to each other through the magnetic flux generated by the spontaneous supercurrents. Using π-rings for the 2D flux coupling experiments eliminates one source of disorder seen in similar experiments using conventional superconducting rings, since π-rings have doubly degenerate ground states in the absence of an applied field. Although anti-ferromagnetic ordering occurs, with larger negative bond orders than previously reported for arrays of conventional rings, long-range order is never observed, even in geometries without geometric frustration. This may be due to dynamical effects. Monte-Carlo simulations of the 2D array cooling process are presented and compared with experiment.

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Vortices with half magnetic flux quanta in ‘‘heavy-fermion’’ superconductors

Cited by 259 publications

References 13 publications

The Intriguing Superconductivity of Strontium Ruthenate

The Intriguing Superconductivity of Strontium Ruthenate

Josephson interferometer in a ring topology as a proof of the symmetry ofSr2RuO4

Antiferromagnetic ordering in arrays of superconductingπ-rings

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