Enhancement of Superconductivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>to 3 K by Embedded Metallic Microdomains

Maeno, Y.; Ando, Takashi; Mori, Y.; Ohmichi, Eiji; Ikeda, S.; Nishizaki, Shin-ya; Nakatsuji, Satoru

doi:10.1103/physrevlett.81.3765

Cited by 168 publications

(132 citation statements)

References 19 publications

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“…The Ginzburg-Landau equations then read 17,28 . A bulk crystal from this batch was measured and showed a broad transition with a bulk T c around 1.35 K, slightly lower than the optimal T c for Sr 2 RuO 4 .…”

Section: Methodsmentioning

confidence: 99%

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Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

et al. 2013

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Superconductors with a chiral p-wave pairing are of great interest because they could support Majorana modes that could enable the development of topological quantum computing technologies that are robust against decoherence. Sr 2 RuO 4 is widely believed to be a chiral p-wave superconductor. Yet, the mechanism by which superconductivity emerges in this, and indeed most other unconventional superconductors, remains unclear. Here we show that the local superconducting transition temperature in the vicinity of lattice dislocations in Sr 2 RuO 4 can be up to twice that of its bulk. This is all the more surprising for the fact that disorder is known to easily quench superconductivity in this material. With the help of a phenomenological theory that takes into account the crystalline symmetry near a dislocation and the pairing symmetry of Sr 2 RuO 4 , we predict that a similar enhancement should emerge as a consequence of symmetry reduction in any superconductor with a two-component order parameter.

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Section: Methodsmentioning

confidence: 99%

“…17), may provide insight into the mechanism issue. The T c enhancement was attributed to the capillary effect at the Ru/Sr 2 RuO 4 interface 18 .…”

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confidence: 99%

Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

et al. 2013

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“…It is reported that Sr 2 RuO 4 has exotic property called as 3K phase [17] when Ru metal is embedded in the single crystal. We speculate that the enhancement of T c is due to the increase of the anisotropy (i.e., decrease of α) near the interface region between Sr 2 RuO 4 and Ru metal.…”

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confidence: 99%

Spin-Triplet Superconductivity due to Antiferromagnetic Spin-Fluctuation inSr2RuO4

2000

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A mechanism leading to the spin-triplet superconductivity is proposed based on the antiferromagnetic spin fluctuation. The effects of anisotropy in spin fluctuation on the Cooper pairing and on the direction of d vector are examined in the one-band Hubbard model with RPA approximation. The gap equations for the anisotropic case are derived and applied to Sr2RuO4. It is found that a nesting property of the Fermi surface together with the anisotropy leads to the triplet superconductivity with the d =ẑ(sin kx ± i sin ky), which is consistent with experiments.74. 74.20Mn, 74.25Dw Since the discovery of superconducting phase in Sr 2 RuO 4 [1], much effort has been paid for understanding its exotic properties. Among several interesting natures, the most fascinating one is that it is a spintriplet superconductor confirmed by NMR experiment [2]. While most superconductors found during several decades are singlet, the only exceptions were 3 He and UPt 3 . Therefore the fact that the triplet pairing is realized in Sr 2 RuO 4 has attracted much attention. While UPt 3 , the second example of spin-triplet superconductor, has a complicated electronic structure, Sr 2 RuO 4 has a rather simple electronic state [1]. Thus clarifying the microscopic mechanism of superconductivity in Sr 2 RuO 4 is very important for understanding the triplet superconductors in general.In 3 He, Cooper pairs are formed due to ferromagnetic spin fluctuations peaked at q = 0 [3,4]. Therefore it is natural to expect the origin of the triplet pairing in Sr 2 RuO 4 is also ferromagnetic spin fluctuation [5,6]. This assumption has been believed to be justified by NMR experiments [7][8][9]. However the recent neutron scattering experiment has shown that there exists a significant peak near q 0 = (±2π/3, ±2π/3) and no sizable ferromagnetic spin fluctuation [10]. Thus it is difficult to assume that the spin fluctuation near q 0 plays no role in the Cooper pairing in Sr 2 RuO 4 . (In the following discussion we call this fluctuation as antiferromagnetic (AF) spin fluctuation, for simplicity.) However this AF fluctuation leads to the singlet superconductivity rather than * e-mail address: t-kuwabara@bea.hi-ho.ne.jp † Address from April 2000, Dept. of Physics, Univ. of Tokyo, Hongo, Bunkyo-ku 113-0033 Tokyo the triplet superconductivity as expected in analogy to high-T c cuprates [5].In this paper we propose a mechanism which gives the triplet pairing even if the spin fluctuation is AF. We find that the characteristic features of Sr 2 RuO 4 are twofold: One is the anisotropy of the spin fluctuation found in NMR experiments [8,9], and the other is a nesting property with momentum q 0 of the two-dimensional Fermi surface. We show that these two features explain the pairing in Sr 2 RuO 4 .In addition to the competition between singlet and triplet pairing, the direction of the d vector, which is the order parameter of triplet superconductivity, is another interesting problem. We show that the anisotropy of the spin fluctuation also explains the experimental fact...

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“…20,21 On the basis of ultrasonic experiments and the Ehrenfest relation, T c is predicted to also be suppressed by the in-plane UAP along the [100] direction P [100] at a rate of (1/T c )(dT c /dP [100] ) = −(0.85 ± 0.05) GPa −1 . 22,23 In contrast, the enhancement of T c up to about 3 K is observed in Sr 2 RuO 4 -Ru eutectic crystals, 24 in which superconductivity with higher T c probably occurs in the Sr 2 RuO 4 part around Sr 2 RuO 4 -Ru interfaces as a consequence of the strong lattice distortion due to lattice mismatch. [24][25][26] A similar enhancement of T c can be caused by out-of-plane UAP P [001] in non eutectic Sr 2 RuO 4 .…”

Section: Introductionmentioning

confidence: 98%

“…22,23 In contrast, the enhancement of T c up to about 3 K is observed in Sr 2 RuO 4 -Ru eutectic crystals, 24 in which superconductivity with higher T c probably occurs in the Sr 2 RuO 4 part around Sr 2 RuO 4 -Ru interfaces as a consequence of the strong lattice distortion due to lattice mismatch. [24][25][26] A similar enhancement of T c can be caused by out-of-plane UAP P [001] in non eutectic Sr 2 RuO 4 . 27 However, because of the technical difficulties in directly measuring the effects of in-plane UAP and uniaxial strain, the effect of in-plane UAP on Sr 2 RuO 4 has been under discussion 28,29 and the effect of in-plane uniaxial strain on Sr 2 RuO 4 has been reported only recently.…”

Section: Introductionmentioning

confidence: 98%

Higher-T_c Superconducting Phase in Sr₂RuO₄ Induced by In-Plane Uniaxial Pressure

et al. 2015

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We revealed that the superconducting transition temperature T c of the multi-component superconductor Sr 2 RuO 4 is enhanced to 3.3 K under in-plane uniaxial pressure that reduces the tetragonal crystal symmetry. This result suggests that new superconducting phases with a one-component order parameter are induced. We have also clarified the inplane pressure direction dependence of the emergence of this higher-T c superconducting phase: pressure along the [100] direction is more favorable than pressure along the [110] direction. This result is probably closely related to the direct shortening of the in-plane Ru-O bond length along the pressure direction and the approach of the γ Fermi surface to the van Hove singularity under P [100] .

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Enhancement of Superconductivity ofSr2RuO4to 3 K by Embedded Metallic Microdomains

Cited by 168 publications

References 19 publications

Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

Spin-Triplet Superconductivity due to Antiferromagnetic Spin-Fluctuation inSr2RuO4

Higher-T_c Superconducting Phase in Sr₂RuO₄ Induced by In-Plane Uniaxial Pressure

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Enhancement of Superconductivity ofSr2RuO4to 3 K by Embedded Metallic Microdomains

Cited by 168 publications

References 19 publications

Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4

Spin-Triplet Superconductivity due to Antiferromagnetic Spin-Fluctuation inSr2RuO4

Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure

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Higher-T_c Superconducting Phase in Sr₂RuO₄ Induced by In-Plane Uniaxial Pressure