Static stress effects in superconducting composites

Dotsenko, V. I.; Kislyak, I.F.; Petrenko, V.T.; Tikhonovsky, М.А.; Shkilko, A.M; Zagoruiko, L.N; Rogozyanskaya, L.M

doi:10.1016/s0011-2275(01)00041-8

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Stress can produce large changes in T c since it may change both the electronic structure and the phonon spectrum of a material [34], [36]- [39]. McMillan [40] showed that metals with weak electron-phonon coupling and low T c , such as Mo, could display large increases in T c upon decreasing the average phonon frequency.…”

Section: Superconducting Critical Temperaturementioning

confidence: 99%

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

Fàbrega

Fernández-Martínez

Parra-Borderías

et al. 2009

IEEE Trans. Appl. Supercond.

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We report on the structural and electrical characterization of Mo thin films deposited at room temperature by RF magnetron sputtering. The effect of RF power on the morphology and residual stress of the films is analyzed. The films are under compressive stress and consist of densely packed columns with a lateral size on the order of 20 nm. The stress, critical temperature, and resistivity of the films are found to rise when increasing the ejected ion energy during the sputtering process. The changes in critical temperature and resistivity are discussed in terms of the observed morphology and stress changes.

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Section: Superconducting Critical Temperaturementioning

confidence: 99%

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

Fàbrega

Fernández-Martínez

Parra-Borderías

et al. 2009

IEEE Trans. Appl. Supercond.

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“…The level of mechanical strain within the Nb 3 Sn filaments has a significant influence on the maximum superconducting current that the wire can carry and therefore the strength of the magnetic field that can be generated [1][2][3][4][5][6][7][8][9]. The level of this strain is dependent on a number of factors, the major ones being (a) the residual strain, (b) the stresses generated when the magnet is energized and (c) the mechanical properties of the wire.…”

Section: Introductionmentioning

confidence: 99%

The influence of the reaction heat-treatment process on the mechanical properties of multi-filamentary composite Nb₃Sn superconducting wires at 77 and 300 K

Harvey¹,

Fellows²,

Durodola³

et al. 2005

Supercond. Sci. Technol.

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Stress-strain curves have been obtained for a 1.5 mm diameter bronze-process multi-filamentary composite Nb 3 Sn wire at 77 and 300 K. Tensile test specimens were prepared with a variety of heat-treatment conditions, ranging from no heat-treatment to one with a duration exceeding that of the wire manufacturer's recommended full heat-treatment. The results show that for each heat-treatment condition, the mechanical properties are significantly different at 77 and 300 K: at the lower temperature, specimens have higher proof stress, are stronger and more ductile. The elastic modulus is not significantly different at 77 and 300 K, but rises from 102 GPa for specimens that were not heat-treated to 110 GPa for fully reacted ones. The proof stress is significantly higher for specimens that were not heat-treated compared to those that were. This is true even for heat-treatment durations that were too short to convert much of the niobium into Nb 3 Sn. Extending the heat-treatment beyond these short durations, and thus increasing the Nb 3 Sn volume fraction, makes the wires more brittle. However, despite having a dramatic effect on the composition, extending the heat-treatment duration does not have much of an effect on the stress-strain curve up to the point of failure.

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Giant Grüneisen parameter in a superconducting quantum paraelectric

Franklin

Davino

et al. 2021

Phys. Rev. B

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Superconductivity and ferroelectricity are typically thought of as incompatible because the former needs free carriers, but the latter is usually suppressed by free carriers. This is unless the carrier concentration is sufficiently low to allow for polar distortions and mobile electrons to cooperate. In the case of strontium titanate with low carrier concentration, superconductivity and ferroelectricity have been shown to be correlated via various tuning methods, such as strain. Here, we report theoretically and experimentally evaluated Grüneisen parameters whose divergent giant values under tensile stress indicate that the dominant phonon mode which enhances the superconducting order is the ferroelectric transverse soft phonon mode. This finding puts strong constraints on other phonon modes as the main contributors to the enhanced superconductivity in strained strontium titanate. The methodology shown here can be applied to strain-tune and probe properties of other materials with polar distortions including topologically non-trivial ones.

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Static stress effects in superconducting composites

Cited by 5 publications

References 9 publications

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

The influence of the reaction heat-treatment process on the mechanical properties of multi-filamentary composite Nb₃Sn superconducting wires at 77 and 300 K

Giant Grüneisen parameter in a superconducting quantum paraelectric

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Static stress effects in superconducting composites

Cited by 5 publications

References 9 publications

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

Effects of Stress and Morphology on the Resistivity and Critical Temperature of Room-Temperature-Sputtered Mo Thin Films

The influence of the reaction heat-treatment process on the mechanical properties of multi-filamentary composite Nb3Sn superconducting wires at 77 and 300 K

Giant Grüneisen parameter in a superconducting quantum paraelectric

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Product

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The influence of the reaction heat-treatment process on the mechanical properties of multi-filamentary composite Nb₃Sn superconducting wires at 77 and 300 K