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Kita, Takafumi

doi:10.1103/physrevlett.83.1846

Cited by 23 publications

(22 citation statements)

References 25 publications

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“…The square lattice and the detail of the magnetic field distribution around the vortices were found to agree qualitatively with a two-component p-wave Ginzburg-Landau theory [17,18,19]. However, SANS is a bulk probe that is sensitive to the long-range correlation in the vortex state rather than to the local structure.…”

mentioning

confidence: 79%

Observation of Vortex Coalescence in the Anisotropic Spin-Triplet SuperconductorSr2RuO4

et al. 2005

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We present direct imaging of magnetic flux structures in the anisotropic, spin-triplet superconductor Sr 2 RuO 4 using a scanning µSQUID microscope. Individual quantized vortices were seen at low magnetic fields. Coalescing vortices forming flux domains were revealed at intermediate fields.Based on our observations we suggest that a mechanism intrinsic to the material stabilizes the flux domains against the repulsive vortex-vortex interaction. Topological defects like domain walls can provide this, implying proof for unconventional chiral superconductivity.

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confidence: 79%

Observation of Vortex Coalescence in the Anisotropic Spin-Triplet SuperconductorSr2RuO4

et al. 2005

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“…The variational wave function is justified near the transition temperature and for a small symmetry-breaking term g, although the reconstruction of higher Landau levels affects the vortex lattice structure at low temperatures 33 . Our main result is concerned with the vortex lattice structural transition near T c , and thus, the variational wave function is appropriate.…”

Section: B Variational Methodsmentioning

confidence: 99%

“…Therefore, the order parameter in nematic-chiral superconductors is nontrivial. Second, various vortex lattice structures are stabilized in the chiral superconductors because of the gradient coupling of two-component order parameters [31][32][33] . Thus, it is expected that rich vortex lattice phases appear in nematic-chiral superconductors.…”

Section: Introductionmentioning

confidence: 99%

Chiral superconductivity in nematic states

Takamatsu

Yanase

2015

Phys. Rev. B

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We investigate chiral superconductivity which occurs in the electronic nematic state. A vortex state in a c-axis magnetic field is studied on the basis of the two-component Ginzburg-Landau model for nematic-chiral superconductors. It is shown that various vortex lattice structures are stabilized by nontrivial cooperation of nematicity and chirality in superconductors. In particular, the vortex lattice structural transition occurs when a square anisotropy parameter ν is positive (negative) and the nematicity is induced along the [110] axis ([100] axis). We discuss nematic-chiral superconductivity in URu2Si2, Sr2RuO4, and UPt3. An experimental test for the examination of nematic order and chiral superconductivity is proposed.

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“…For a field along the (1, 0, 0) direction, the solution near H c2 is η = (0, 1) (for the three values of ǫ discussed above this was the case) then as field is reduced for fixed temperature, a second transition occurs at H 2 for which the η = (1, 0) component becomes non-zero. Such phase transitions have only been examined within Ginzburg Landau theory 28,40 . The Eilenberger equations discussed above allow for the examination of this phase transition throughout the entire H-T phase diagram.…”

Section: B Phase Diagrammentioning

confidence: 99%

Quasiclassical determination of the in-plane magnetic field phase diagram of superconductingSr2RuO4

2005

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We have carried out a determination of the magnetic-field-temperature (H-T) phase diagram for realistic models of the high field superconducting state of tetragonal Sr2RuO4 with fields oriented in the basal plane. This is done by a variational solution of the Eilenberger equations. This has been carried for spin-triplet gap functions with a d-vector along the c-axis (the chiral p-wave state) and with a d-vector that can rotate easily in the basal plane. We find that, using gap functions that arise from a combination of nearest and next nearest neighbor interactions, the upper critical field can be approximately isotropic as the field is rotated in the basal plane. For the chiral dvector, we find that this theory generically predicts an additional phase transition in the vortex state. For a narrow range of parameters, the chiral d-vector gives rise to a tetracritical point in the H-T phase diagram. When this tetracritical point exists, the resulting phase diagram closely resembles the experimentally measured phase diagram for which two transitions are only observed in the high field regime. For the freely rotating in-plane d-vector, we also find that additional phase transition exists in the vortex phase. However, this phase transition disappears as the in-plane d-vector becomes weakly pinned along certain directions in the basal plane.

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Vortex States of theEuModel forSr2RuO4

Cited by 23 publications

References 25 publications

Observation of Vortex Coalescence in the Anisotropic Spin-Triplet SuperconductorSr2RuO4

Observation of Vortex Coalescence in the Anisotropic Spin-Triplet SuperconductorSr2RuO4

Chiral superconductivity in nematic states

Quasiclassical determination of the in-plane magnetic field phase diagram of superconductingSr2RuO4

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