DC Current Driven Critical Current Variation in Sr<sub>2</sub>RuO<sub>4</sub>–Ru Junction Proved by Local Transport Measurements

Kambara, Hiroshi; Matsumoto, Tetsuro; Kashiwaya, Hiromi; Kashiwaya, Satoshi; Yaguchi, Hiroshi; Asano, Yasuhiro; Tanaka, Yukio; Maeno, Y.

doi:10.1143/jpsj.79.074708

Cited by 8 publications

(16 citation statements)

References 26 publications

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“…The domain size is almost consistent with those estimated by several results using the 3-K phase [25][26][27], while it is somewhat larger than ∼1 µm estimated by Kidwingira et al [19]. We speculate that the relatively larger domain can be induced by s-wave Nb films whose superconducting transition temperature T c (∼6.5 K) is higher than that of SRO.…”

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confidence: 91%

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Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Saitoh¹,

Kashiwaya²,

Kashiwaya³

et al. 2015

Phys. Rev. B

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Clarifying the chiral domains structure of superconducting Sr2RuO4 has been a long-standing issue in identifying its peculiar topological superconducting state. We evaluated the critical current Ic versus the magnetic field H of Nb/Sr2RuO4 Josephson junctions, changing the junction dimension in expectation of that the number of domains in the junction is controlled. Ic(H) exhibits a recovery from inversion symmetry breaking to invariance when the dimension is reduced to several microns. This inversion invariant behavior indicates the disappearance of domain walls; thus, the size of a single domain is estimated at approximately several microns.

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confidence: 91%

“…We note that the IS is insensitive to the junction dimension, λ J , and the uniformity of the current. According to the previous experiments, chiral domain wall motion is considered to be excited by applied magnetic fields [19] or by a current flow [25][26][27]. Here, we aim to test the domain wall motion by reducing the junction dimension.…”

mentioning

confidence: 99%

Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Saitoh¹,

Kashiwaya²,

Kashiwaya³

et al. 2015

Phys. Rev. B

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“…It was interpreted as due to the motion of the chiral domain walls which alters the critical current. [222][223][224] As a novel phenomenon ascribable to real-spatial topology of chiral superconductivity, the critical current of a junction between Sr 2 RuO 4 and the s-wave superconductor Pb has been investigated. 225) Pb/Ru/Sr 2 RuO 4 proximityjunctions (Fig.…”

Section: Sr 2 Ruo 4 As a Topological Superconductormentioning

confidence: 99%

Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄

et al. 2012

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This review presents a summary and evaluations of the superconducting properties of the layered ruthenate Sr 2 RuO 4 as they are known in the autumn of 2011. This paper appends the main progress that has been made since the preceding review by Mackenzie and Maeno was published in 2003. Here, special focus is placed on the critical evaluation of the spin-triplet, odd-parity pairing scenario applied to Sr 2 RuO 4 . After an introduction to superconductors with possible odd-parity pairing, accumulated evidence for the pairing symmetry of Sr 2 RuO 4 is examined. Then, significant recent progress on the theoretical approaches to the superconducting pairing by Coulomb repulsion is reviewed. A section is devoted to some experimental properties of Sr 2 RuO 4 that seem to defy simple explanations in terms of currently available spin-triplet scenario. The next section deals with some new developments using eutectic boundaries and micro-crystals, which reveals novel superconducting phenomena related to chiral edge states, odd-frequency pairing states, and half-fluxoid states. Some of these properties are intimately connected with the properties as a topological superconductor. The article concludes with a summary of knowledge emerged from the study of Sr 2 RuO 4 that are now more widely applied to understand the physics of other unconventional superconductors, as well as with a brief discussion of relatively unexplored but promising areas of ongoing and future studies of Sr 2 RuO 4 .KEYWORDS: Sr 2 RuO 4 , ruthenate, spin-triplet superconductivity, topological superconductor Spin-Triplet Superconductors Candidates of spin-triplet superconductorsIn the last three decades, and particularly since the discovery of high-transition-temperature (high-T c ) superconductivity of the cuprates, 1) studies of ''unconventional'' superconductivity have been one of the main topics in condensed-matter physics. Here we designate the term ''unconventional'' as the pairing based on non-phonon mechanisms.2) The unconventional superconductivity is mainly found in heavy-fermion superconductors (since 1978), 3) Unconventional superconductivity is characterized by the anisotropic gap function or order parameter which is integrated to be zero or a small value due to the variations of the wave function ''phase'', in contrast to an ordinary s-wave state. In many of them, including high-T c cuprates and iron pnictides, the electrons are clearly paired in spinsinglet states. In this point of view, they are similar to conventional s-wave superconductors, in which the spindegrees of freedom is lost in the charged superfluids. Spintriplet superfluid states are fully established in the Fermi liquid 3 He, 7,8) for which spin and mass supercurrents emerge in the charge-neutral superfluids. The question is then whether or not spin-triplet superconductors exist, and what novel superconducting properties they may exhibit due to their charge and spin supercurrents.There are several classes of candidates of spin-triplet superconductors represented in Table I. W...

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“…As a result, two chiral domains are naturally separated by a chiral domain wall (chiral-DW), like ferromagnetic domain walls in a ferromagnetic material. Recently, the existence of chiral-DWs and its dynamic behavior has been investigated experimentally and theoretically 11,[19][20][21][22][23][24][25][26] . Kindwingra et al 19 , reported complicated and hysteretic diffraction patterns in Pb/Cu/SRO junctions.…”

Section: Introductionmentioning

confidence: 99%

Multicomponent order parameter superconductivity of Sr2RuO4 revealed by topological junctions

et al. 2017

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Single crystals of the Sr2RuO4-Ru eutectic system are known to exhibit enhanced superconductivity at 3 K, in addition to the bulk superconductivity of Sr2RuO4 at 1.5 K. The 1.5-K phase is believed to be a spin-triplet, chiral p-wave state with the multi-component order parameter, giving rise to chiral domain structure. In contrast, the 3-K phase is attributable to enhanced superconductivity of Sr2RuO4 in the strained interface region between Ru inclusion of a few to tens of micrometers in size and the surrounding Sr2RuO4. We investigate the dynamic behavior of a topological junction, where a superconductor is surrounded by another superconductor. Specifically, we fabricated Nb/Ru/Sr2RuO4 topological superconducting junctions, in which the difference in phase winding between the s-wave superconductivity in Ru micro-islands induced from Nb and the superconductivity of Sr2RuO4 mainly governs the junction behavior. Comparative results of the asymmetry, hysteresis and noise in junctions with different sizes, shapes, and configurations of Ru inclusions are explained by the chiral domain-wall motion in these topological junctions. Furthermore, a striking difference between the 1.5-K and 3-K phases is clearly revealed: the large noise in the 1.5-K phase sharply disappears in the 3-K phase. These results confirm the multi-component order-parameter superconductivity of the bulk Sr2RuO4, consistent with the chiral p-wave state, and the proposed non-chiral single-component superconductivity of the 3-K phase.

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DC Current Driven Critical Current Variation in Sr₂RuO₄–Ru Junction Proved by Local Transport Measurements

Cited by 8 publications

References 26 publications

Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄

Multicomponent order parameter superconductivity of Sr2RuO4 revealed by topological junctions

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DC Current Driven Critical Current Variation in Sr2RuO4–Ru Junction Proved by Local Transport Measurements

Cited by 8 publications

References 26 publications

Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Inversion symmetry of Josephson current as test of chiral domain wall motion inSr2RuO4

Evaluation of Spin-Triplet Superconductivity in Sr2RuO4

Multicomponent order parameter superconductivity of Sr2RuO4 revealed by topological junctions

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Product

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DC Current Driven Critical Current Variation in Sr₂RuO₄–Ru Junction Proved by Local Transport Measurements

Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄