Superconducting properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>RbOs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>analyzed within Eliashberg theory

Manalo, S.; Michor, H.; Hilscher, G.; Brühwiler, M.; Batlogg, B.

doi:10.1103/physrevb.73.224520

Cited by 12 publications

(10 citation statements)

References 37 publications

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“…Our D(t) curve for Rb is considerably different from that reported by Brühwiler et al, 31) which seems more conventional and has been reproduced within the framework of s-wave Eliashberg theory, which includes anisotropy and the effects of impurity scattering. 63) However, it is noticed that there is a similar tendency for their D(t) curve to become positive near T c as in our curve. The experimental procedure to determine D(t) is sensitive, particularly near T c , to the sharpness of the transition in the specific heat data.…”

Section: Thermodynamic Critical Field H Csupporting

confidence: 73%

“…Eliashberg theory and obtained a small gap anisotropy parameter of <a 2 > ~ 0.005 and a Fermi velocity anisotropy parameter of <b 2 > = 0.3 -0.35. 63) In contrast, Magishi et al obtained a larger anisotropy of the s-wave gap based on the results of Rb NMR measurements at low temperature. 14) The anisotropy renormalizes the gap at the low-temperature limit as 2 /…”

Section: Possible Anisotropy In the Superconducting Gapmentioning

confidence: 96%

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Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides AOs₂O₆

et al. 2009

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The superconducting properties of two -pyrochlore oxides, CsOs 2 O 6 and RbOs 2 O 6 , are studied by thermodynamic and transport measurements using high-quality single crystals. It is shown that the character of superconductivity changes systematically from weak coupling for CsOs 2 O 6 to moderately strong coupling for RbOs 2 O 6 , and finally to extremely strong coupling with BCS-type superconductivity for KOs 2 O 6 , with increasing T c . Strong-coupling correction analyses of the superconducting properties reveal that a low-energy rattling mode of the alkali metal ions is responsible for the mechanism of the superconductivity in each compound. The large enhancement of T c from Cs to K is attributed to the increase in the electron-rattler coupling with decreasing characteristic energy of the rattling and with increasing anharmonicity. The existence of weak anisotropy in the superconducting gap or in the electron-rattler interactions is found for the Cs and Rb compounds.

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Section: Thermodynamic Critical Field H Csupporting

confidence: 73%

Section: Possible Anisotropy In the Superconducting Gapmentioning

confidence: 96%

Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides AOs₂O₆

et al. 2009

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“…The β-pyrochlore oxides AOs 2 O 6 (A=K, Rb, or Cs) are one of the material families that have unique cage-like structure, and A-cation inclusions exhibit large anharmonic local oscillations. [1][2][3][4][5][6][7][8][9] Such anharmonic and largeamplitude oscillations strongly interact with conduction electrons, which leads to strong coupling superconductivity, [10][11][12] anomalous temperature dependence of electric resistivity 4,13 and nuclear relaxation time. 5,14 To explain such interesting properties is a big challenge for the theory of electron-phonon systems and strong coupling theory of superconductivity.…”

mentioning

confidence: 99%

Phonon Dynamics and Multipolar Isomorphic Transition in β-Pyrochlore KOs₂O₆

Hattori

Tsunetsugu

2011

J. Phys. Soc. Jpn.

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We investigate with a microscopic model anharmonic K-cation oscillation observed by neutron experiments in β-pyrochlore superconductor KOs2O6, which also shows a mysterious first-order structural transition at Tp=7.5 K. We have identified a set of microscopic model parameters that successfully reproduce the observed temperature dependence and the superconducting transition temperature. Considering changes in the parameters at Tp, we can explain puzzling experimental results about electron-phonon coupling and neutron data. Our analysis demonstrates that the first-order transition is multipolar transition driven by the octupolar component of K-cation oscillations. The octupole moment does not change the symmetry and is characteristic to noncentrosymmetric K-cation potential.

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“…To date, many studies seem to focus on the possibility; however correlations between the anomalous lattice properties and the superconductivity are still under debate [4][5][6][7][8][9][10][11][12][13]. Further additional studies are expected to help to make clear the issue.…”

Section: Introductionmentioning

confidence: 99%