Magnetic penetration depth in<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>studied by muon spin rotation

Khasanov, R.; Eshchenko, D. G.; Castro, D. Di; Shengelaya, А.; Mattina, Fabio La; Maisuradze, A.; Baines, C.; Luetkens, H.; Karpiński, J.; Казаков, С. М.; Keller, H.

doi:10.1103/physrevb.72.104504

Cited by 43 publications

(44 citation statements)

References 42 publications

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“…Ref. [27] and references therein). More important, is that the parameters obtained by analysing CrAs µSR data for the sample placed inside the double-wall CuBe/MP35N or single-wall CuBe pressure cells remain almost the same.…”

Section: Scientific Example: Pressure Induced Superconductivity In Bimentioning

confidence: 99%

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

Shermadini

Khasanov

Elender

et al. 2017

High Pressure Research

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A low background double-wall piston-cylinder-type pressure cell is developed at the Paul Scherrer Institute. The cell is made from BERYLCO-25 (beryllium copper) and MP35N nonmagnetic alloys with the design and dimensions which are specifically adapted to muon-spin rotation/relaxation (µSR) measurements. The mechanical design and performance of the pressure cell are evaluated using finite-element analysis (FEA). By including the measured stress-strain characteristics of the materials into the finite-element model, the cell dimensions are optimized with the aim to reach the highest possible pressure while maintaining the sample space large (6 mm in diameter and 12 mm high). The presented unconventional design of the double-wall piston-cylinder pressure cell with a harder outer MP35N sleeve and a softer inner CuBe cylinder enables pressures of up to 2.6 GPa to be reached at ambient temperature, corresponding to 2.2 GPa at low temperatures without any irreversible damage to the pressure cell. The nature of the muon stopping distribution, mainly in the sample and in the CuBe cylinder, results in a low-background µSR signal.

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Section: Scientific Example: Pressure Induced Superconductivity In Bimentioning

confidence: 99%

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

Shermadini

Khasanov

Elender

et al. 2017

High Pressure Research

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“…Extensive study has been carried out on the three -pyrochlore oxides in order to elucidate the nature of their superconductivity. For the superconducting gap symmetry, most experimental results indicate that it is of the s-wave BCS type, [12][13][14][15][16][17][18][19][20] suggesting conventional phonon-mediated superconductivity; there is no evidence of an alternative ''glue'' such as magnetic fluctuations, which are sometimes found in an exotic superconductor with a nodal gap. Interestingly, pronounced variations of various properties have been observed over the series.…”

Section: Introductionmentioning

confidence: 99%

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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“…Subsequently, superconductivity was also discovered in the pyrochlore oxides KOs 2 O 6 (T c ≃ 9.6 K) [56], RbOs 2 O 6 (T c ≃ 6.3 K) [51], and CsOs 2 O 6 (T c ≃ 3.3 K) [57]. Specific heat [58,59], magnetization, muon-spin-rotation (µSR) studies of the magnetic penetration depth [60,61], and the pressure effect measurements [60] on RbOs 2 O 6 reveal consistent evidence for meanfield behavior, except close to T c , where thermal fluctuations are observed. Indeed, the analysis of extended measurements of the temperature dependence of the magnetic penetration depth λ strongly suggest that RbOs 2 O 6 falls in the universality class of charged superconductors because charged critical fluctuations were found to dominate the temperature dependence of λ near T c [62].…”

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Magnetic field induced 3D–1D crossover in type-II superconductors

Schneider

2008

J. Phys.: Condens. Matter

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Abstract. We review and analyze magnetization and specific heat investigations on type-II superconductors which uncover remarkable evidence for the magnetic field induced finite size effect and the associated 3D to 1D crossover which enhances thermal fluctuations. Indeed, the correlation length transverse to the magnetic field H i , applied along the i-axis, cannot grow beyond the limiting magnetic length1/2 , related to the average distance between vortex lines. Noting that 1D is incompatible with the occurrence of a continuous phase transition at finite temperatures, the mean-field transition line H C2 (T ) is replaced by the 3D to 1D crossover line Hp (T ). Since the magnetic field induced finite size effect relies on thermal fluctuations and there enhancement originating from the 3D to 1D crossover, its observability is not be restricted to type-II superconductors with small correlation volume only, including YBa 2 Cu 4 O 8 , NdBa 2 Cu 3 O 7−δ , YBa 2 Cu 3 O 7−δ , and DyBa 2 Cu 3 O 7−δ , where 3D-xy critical behavior was already observed in zero field. Indeed, our analysis of the reversible magnetization of RbOs 2 O 6 and the specific heat of Nb 77 Zr 23 , Nb 3 Sn and NbSe 2 reveals that even in these low Tc superconductors with comparatively large correlation volume the 3D to 1D crossover is observable in sufficiently high magnetic fields. Consequently, below Tc and above H pi (T ) superconductivity is confined to cylinders with diameter L H i (1D) and there is no continuous phase transition in the (H, T ) -plane along the H c2 (T ) -line as predicted by the mean-field treatment. Moreover we observe that the thermodynamic vortex melting transition occurs in the 3D regime. While in YBa 2 Cu 4 O 8 , NdBa 2 Cu 3 O 7−δ , YBa 2 Cu 3 O 7−δ , and DyBa 2 Cu 3 O 7−δ it turns out to be driven by 3D-xy thermal fluctuations, the specific heat data of the conventional type-II superconductors Nb 77 Zr 23 , Nb 3 Sn and NbSe 2 point to Gaussian fluctuations. Because the vortex melting and the 3D-1D crossover line occur at universal values of the scaling variable their relationship is universal.

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Magnetic penetration depth inRbOs2O6studied by muon spin rotation

Cited by 43 publications

References 42 publications

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides AOs₂O₆

Magnetic field induced 3D–1D crossover in type-II superconductors

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Magnetic penetration depth inRbOs2O6studied by muon spin rotation

Cited by 43 publications

References 42 publications

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

A low-background piston–cylinder-type hybrid high pressure cell for muon-spin rotation/relaxation experiments

Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides AOs2O6

Magnetic field induced 3D–1D crossover in type-II superconductors

Contact Info

Product

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Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides AOs₂O₆