Quenched metastable vortex states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Shibata, Daisuke; Tanaka, Hiromu; Yonezawa, Suguru; Nojima, Tsutomu; Maeno, Y.

doi:10.1103/physrevb.91.104514

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…The chiral domain walls should exist only in the ab plane if the 2d γ band is the active superconducting band, thus it is not clear whether the strong pinning for || H ab is due to the same mechanism. A further experiment, e.g., a study of ac susceptibility on the in-plane metastable vortex state [49], maybe helpful to investigate this issue.…”

Section: Discussionmentioning

confidence: 99%

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

et al. 2017

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Sr 2 RuO 4 (SRO) is the prime candidate for a chiral p-wave superconductor with critical temperaturẽ ( ) T SRO 1.5 c K. Chiral domains with opposite chiralities  p p i x y have been proposed, but are yet to be confirmed. We measure the field dependence of the point contact (PC) resistance between a tungsten tip and an SRO-Ru eutectic crystal, where micrometer-sized Ru inclusions are embedded in SRO with an atomically sharp interface. Ruthenium is an s-wave superconductor with( ) T Ru 0.5 c K; flux pinned near the Ru inclusions can suppress its superconductivity, as reflected in the PC resistance and spectra. This flux pinning effect originates from SRO underneath the surface and is very strong once flux is introduced. To fully remove flux pinning, one needs to thermally cycle the sample above T c (SRO) or apply alternating fields with decreasing amplitude. With alternating fields, the observed hysteresis in magnetoresistance can be explained by domain dynamics, providing support for the existence of chiral domains. The origin of the strong pinning could be the chiral domains themselves.

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Section: Discussionmentioning

confidence: 99%

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

et al. 2017

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“…One possibility is that the Cooper pair is formed between electrons in different layers by interlayer coupling, and the superconductivity is destroyed owing to suppression of the interlayer coupling by the external field parallel to the ab plane, because the coherence length along the c axis is somewhat longer than the interlayer spacing but of a similar magnitude. 22 Although it is unlikely that the interlayer interaction is dominant in Sr 2 RuO 4 because the conductivity is two dimensional, the three dimensionality might be crucially important for understanding the depairing mechanism on the superconductivity in Sr 2 RuO 4 .…”

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confidence: 99%

Absence of the O17 Knight-shift changes across the first-order phase transition line in Sr2RuO4

et al. 2016

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We performed17 O nuclear magnetic resonance measurements on superconducting (SC) Sr2RuO4 under in-plane magnetic fields. We found that no new signal appears in the SC state and that the 17 O Knight shifts obtained from the double-site measurements remain constant across the first-order phase-transition line, as well as across the second-order phase-transition line as already reported. The present results indicate that the SC spin susceptibility does not decrease in the high-field region, although a magnetization jump in the SC state was reported at low temperatures. Because the spin susceptibility is unchanged in the SC state in Sr2RuO4, we suggest that the first-order phase transition across the upper critical field should be interpreted as a depairing mechanism other than the conventional Pauli-paramagnetic effect.The layered perovskite Sr 2 RuO 4 has attracted special attention, because it has been suggested that Sr 2 RuO 4 may be a chiral p-wave spin-triplet superconductor.1 The chiral state is shown from the broken time-reversal symmetry probed by µSR 2 and Kerr-effect 3 measurements. The existence of spin-triplet equal-spin pairing is based on experimental results that show the spin susceptibility is unchanged on passing through the superconducting (SC) transition temperature T c , as revealed by nuclear magnetic resonance (NMR) Knight-shift measurements at the Ru and O sites 4-8 and polarized neutron scattering measurements.9 The chiral p-wave spin-triplet state would be an SC state analogous to the superfluid 3 He A-phase with two dimensionality.However, several recent experimental results are difficult to interpret with the above SC state. The firstorder (FO) SC-normal (S-N) transition 10 accompanied by a clear magnetization jump 11 is observed in a lowtemperature region near the upper critical field H c2 for fields parallel to the ab plane. This abrupt S-N transition suggests that Sr 2 RuO 4 is a spin-singlet superconductor, because this cannot be interpreted by the conventional orbital depairing effect but seems to be explained consistently by the conventional Pauli-paramagnetic effect. Indeed, the experimental µ 0 H c2 for T → 0 nearly matches the Pauli-limiting field µ 0 H Pauli estimated using the well-1/2 ∼ 1.4 T with χ sc = 0, where E cond is the SC condensation energy and χ n and χ sc are the spin susceptibilities in the normal and SC states, respectively. Here, χ sc = 0 means that the spin susceptibility totally vanishes in the SC state, which contradicts the above spin-susceptibility results showing χ n = χ sc .Recently, we performed 99 Ru Knight-shift ( 99 K) measurements again to re-examine the previous results, and found a new phenomenon that the spin susceptibility slightly increases in the SC state at lower magnetic fields.12 We reported that this experimental result further suggests the spin-triplet equal-spin pairing state. 13Because the hyperfine coupling constant A hf at the 99 Ru site is largest among the nuclei that are feasible for NMR in Sr 2 RuO 4 ( 99 A hf ∼ −25 T/µ B ), 6 the s...

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“…For example, in the case of type-II superconductors with isotropic repulsion, the vortices form a triangular lattice [3]. There are, however, many examples of particle-like systems that have twofold anisotropic interactions, including colloidal particles in tilted magnetic fields [27,28], dusty plasmas [29], electron liquid crystal states [30][31][32], skyrmions [33][34][35], and superconducting vortices [36][37][38][39][40][41][42][43]. Anisotropic vortex-vortex interactions can arise from anisotropy in the material or nematicity in the substrate, or it can be induced by a tilted field in uniaxial superconductors.…”

Section: Introductionmentioning

confidence: 99%

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

2022

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We examine the dynamics of superconducting vortices with two-fold anisotropic interaction potentials driven over random pinning, and compare the behavior under drives applied along the hard and the soft anisotropy directions. As the driving force increases, the number of topological defects reaches a maximum near the depinning threshold, and then decreases as the vortices form one-dimensional chains. This coincides with a transition from a pinned nematic to a moving smectic aligned with the soft anisotropy direction. The system is generally more ordered when the drive is applied along the soft direction of the anisotropy. For driving along the hard direction, there is a critical value of the twofold anisotropy above which the system remains aligned with the soft direction. Hysteretic behavior appears upon cycling the driving force, with one-dimensional vortex chains persisting during the decreasing leg below the threshold for chain formation for increasing drive. More anisotropic systems have a greater amount of structural disorder in the moving state. For lower anisotropy, the system forms a moving smectic-A state, while at higher anisotropy, a moving nematic state appears instead.

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Quenched metastable vortex states inSr2RuO4

Cited by 6 publications

References 44 publications

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Absence of the O17 Knight-shift changes across the first-order phase transition line in Sr2RuO4

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

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Quenched metastable vortex states inSr2RuO4

Cited by 6 publications

References 44 publications

Probing chiral superconductivity in Sr2RuO4underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr2RuO4underneaththe surface by point contact measurements

Absence of the O17 Knight-shift changes across the first-order phase transition line in Sr2RuO4

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

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Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements