Pauli paramagnetic effects on mixed-state properties in a strongly anisotropic superconductor: Application to<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>

Amano, Yuujirou; Ishihara, Masahiro; Ichioka, Masanori; Nakai, N.; Machida, Kazushige

doi:10.1103/physrevb.91.144513

Cited by 29 publications

(52 citation statements)

References 83 publications

(123 reference statements)

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“…36 However, numerical solutions to the Elienberger equations that include PPEs do provide a qualitatively accurate description of the measured Ω-dependence of the transverse VL form factor, and thereby further support for Pauli limiting in Sr 2 RuO 4 . 50,75 The numerical work also provides an estimate of the longitudinal form factor, which despite the PPE enhancement remains approximately two orders of magnitude smaller than h x . 50 From the rocking curves shown in Fig.…”

Section: Iv2 Possible Pauli Limiting and Pauli Paramagnetic Effectsmentioning

confidence: 95%

Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice

et al. 2017

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Despite numerous studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with the field applied close to both the 100 and 110 basal plane directions. Measurements at high field were made possible by the use of both spin polarization and analysis to improve the signal-to-noise ratio. Rotating the field towards the basal plane causes a distortion of the square vortex lattice observed for H 001 , and also a symmetry change to a distorted triangular symmetry for fields close to 100. The vortex lattice distortion allows us to determine the intrinsic superconducting anisotropy between the c axis and the Ru-O basal plane, yielding a value of ∼ 60 at low temperature and low to intermediate fields. This greatly exceeds the upper critical field anisotropy of ∼ 20 at low temperature, reminiscent of Pauli limiting. Indirect evidence for Pauli paramagnetic effects on the unpaired quasiparticles in the vortex cores are observed, but a direct detection lies below the measurement sensitivity. The superconducting anisotropy is found to be independent of temperature but increases for fields 1 T, indicating multiband superconductvity in Sr2RuO4. Finally, the temperature dependence of the scattered intensity provides further support for gap nodes or deep minima in the superconducting gap.

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Section: Iv2 Possible Pauli Limiting and Pauli Paramagnetic Effectsmentioning

confidence: 95%

Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice

et al. 2017

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“…(6), in accord with the experimental data within the error bars. Here,

Θ

measures the tilting of the external field direction from the c ‐axis and

H_{c 2, italicab}^{orb}

is the orbital limited upper critical field without paramagnetic effects and

μ false(T false)

denotes the pair ‐breaking parameter (notice that

μ false(0 false) = α_{M} / 1.76

, where

α_{M}

is the frequently used Maki parameter) scaled by the d ‐wave gap function

Δ false(T false)

and the orbital limited Werthamer–Helfand–Hohenberg (WHH) upper critical field

…”

Section: Afe2as2 a = K Rb Cs Puzzles –A Challenge For Theorymentioning

confidence: 99%

“…At variance with the numerical investigation of Sr 2 RuO

_{4}

performed in Ref. (which is also a multiband superconductor with a single dominant band), we have used high ‐quality analytical approximations for the reduced gap amplitude

Δ false(T false) / Δ false(0 false)

and the orbital upper critical field

H_{c 2}^{orb} false(T false) / H_{c 2}^{orb} false(0 false)

, both entering the right side of Eq. (10).…”

Section: Afe2as2 a = K Rb Cs Puzzles –A Challenge For Theorymentioning

confidence: 99%

Constraints on the total coupling strengthto bosons in the iron based superconductors

Drechsler

Johnston

Grinenko

et al. 2017

Phys. Status Solidi B

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Despite the fact that the Fe-based superconductors (FeSCs) were discovered nearly ten years ago, the community is still devoting a tremendous effort towards elucidating their relevant microscopic pairing mechanism(s) and interactions. At present, there is still no consistent interpretation of their normal state properties, where the strength of the electron-electron interaction and the role of correlation effects are under debate. Here, we examine several common materials and illustrate various problems and concepts that are generic for all FeSCs. Based on empirical observations and qualitative insight from density functional theory, we show that the superconducting and low-energy thermodynamic properties of the FeSCs can be described semi-quantitively within multiband Eliashberg theory. We account for an important high-energy mass renormalization phenomenologically, and in agreement with constraints provided by thermodynamic, optical, and angle-resolved photoemission data. When seen in this way, all FeSCs with T c < 40 K studied so far are found to belong to an intermediate coupling regime. This finding is in contrast to the strong coupling scenarios proposed in the early period of the FeSC history. We also discuss several related issues, including the role of band shifts as measured by the positions of van Hove singularities, and the nature of a recently suggested quantum critical point in the strongly hole-doped systems AFe 2 As 2 (A = K, Rb, Cs). Using high-precision full relativistic GGA-band structure calculations, we arrive at a somewhat milder mass renormalization in comparison with previous studies. From the calculated mass anisotropies of all Fermi surface sheets, only the ε-pocket near the corner of the BZ is compatible with the experimentally observed anisotropy of the upper critical field, pointing to its dominant role in the superconductivity of these three compounds.

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“…Here the clear evidence for the FFLO state has recently been reported in organic compounds [47][48][49] and a heavy fermion system CeCoIn 5 [50][51][52]. Theoretical calculations taking the paramagnetic effect into account have been proposed to explain experimental aspects such as field dependence of the specific heat, and H c2 suppression in Sr 2 RuO 4 [41,[53][54][55]. The consideration of the mixture of both singlet-and triplet-pairing would be promising for fully understanding of the novel superconductivity in Sr 2 RuO 4 .…”

Section: (D)-(f)mentioning

confidence: 99%

Superconducting subphase in the layered perovskite ruthenateSr2RuO4in a parallel magnetic field

et al. 2016

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Magnetic torque measurements using micro-cantilever have been performed to investigate the superconducting phase of Sr2RuO4 down to 40 mK. For high-quality single crystals with the transition temperature (Tc) of 1.48 -1.49 K, an abrupt jump of the torque signal is found near 1.5 T in field parallel to the conducting RuO2 planes below ∼ 0.8 K. The jump corresponds to the first order transition recently revealed by magnetocaloric and magnetization measurements [Yonezawa et al., Phys. Rev. Lett. 110, 077003 (2013); Kittaka et al., Phys. Rev. B 90, 220502(R) (2014)]. Furthermore, weak diamagnetic and irreversible signals are found to persist above the first order transition up to 1.85 T. The result indicates the presence of a subphase boundary separating lowand high-field phases in the superconducting phase. The high-field subphase disappears when the field is tilted from the conducting planes only by a few degrees. Quantum oscillation measurements are also reported to clarify the strong sample-quality dependence of the high-field subphase.

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Pauli paramagnetic effects on mixed-state properties in a strongly anisotropic superconductor: Application toSr2RuO4

Cited by 29 publications

References 83 publications

Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice

Anisotropy and multiband superconductivity in Sr2RuO4 determined by small-angle neutron scattering studies of the vortex lattice

Constraints on the total coupling strengthto bosons in the iron based superconductors

Superconducting subphase in the layered perovskite ruthenateSr2RuO4in a parallel magnetic field

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