Effect of uniaxial stress on the superconducting transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml

Welp, U.; Grimsditch, M.; Fleshler, S.; Nessler, Winfried; Downey, J.W.; Crabtree, G. W.; Guimpel, J.

doi:10.1103/physrevlett.69.2130

Cited by 211 publications

(122 citation statements)

References 21 publications

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“…Single crystal data on YBCO show that if the a-axis is parallel to the applied strains, Tc will increase with increased tensile strain whereas it will decrease for those domains with their a-axis orthogonal to applied tensile strains. Also strain in the c-direction has little effect on Tc -at least and order of magnitude smaller than in the a-or b-directions [36]. This behavior is also consistent with reports on detwinned (Y,Gd)BCO coated conductors [37].…”

Section: Local Strain and Consistency Between Different Types Of Meassupporting

confidence: 78%

“…It was reasonable at that time to assume the peak in Jc under force free conditions was also the coincidental occurrence of the peak in the density of states. However the measurements on single crystals of Nb3Sn show anisotropic behavior [45] reminiscent of the data for single crystals of REBCO [36]. Naturally this opens the possibility that the peak in Jc found in both Nb3Sn (LTS) and REBCO (HTS) polycrystalline materials has the same origin -broadly explained by the peak occurring when there is uniform Tc throughout the material (or at least a minimum in the width of the distribution of Tc) and an inverted quasi-parabolic behaviour associated with anisotropic properties and broadly described in Section 3.5.…”

Section: 2mentioning

confidence: 99%

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Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Osamura¹,

Machiya²,

Hampshire³

2016

Supercond. Sci. Technol.

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. In order to elucidate the effect of uniaxial strain on the critical current of practical REBCO tapes (REBa2Cu3O7-d, RE = Y and Gd) fabricated by Superpower and SuNAM, two types of critical current measurements were carried out. In the first, the tape sample was attached directly to a universal testing machine and pulled under a tensile load. In the second, the tape was soldered to a Cu-Be springboard (SB) and then attached to the testing machine and then pushed or pulled in order to apply both tensile and compressive strains to the tape sample. An inverse parabolic behavior was observed for the uniaxial strain dependence of the critical current of both tapes.Using synchrotron radiation, the local strain exerted on the REBCO layer was measured at room temperature under the conditions used for the two techniques for making Ic measurements. On the basis of these room temperature data, the local strain exerted on the REBCO layer at 77 K was numerically evaluated.A one-dimensional chain model for current flow in the REBCO material with fractional lengths of A-domains and B-domains oriented along the uniaxial strain direction is proposed. The model can explain the parabolic strain behavior of the critical current and shows that the strain at which the peak in Ic occurs, is not only determined by pre-compression or pre-tension on the superconductor at the operating temperature, but also by the ratio of the fractional amounts of the two domains.

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Section: Local Strain and Consistency Between Different Types Of Meassupporting

confidence: 78%

Section: 2mentioning

confidence: 99%

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Osamura¹,

Machiya²,

Hampshire³

2016

Supercond. Sci. Technol.

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“…For most high-T c materials the uniaxial pressure effect in a/b-and in c-direction is anisotropic [54][55][56][57][58] and in Y123 the effect of pressure in a-and b-direction is even of opposite sign [59][60][61][62][63] due to the orthorhombic structure caused by the CuO chains. Such a delicate effect has naturally not been found in any tetragonal high-T c material and even the very similar YBa 2 Cu 4 O 8 which has a doubled CuO chain with a fixed oxygen content does not show pressure effects in a-and baxis directions with opposite signs [54].…”

Section: Introductionmentioning

confidence: 99%

The effect of chemical doping and hydrostatic pressure on Tc of Y1−yCayBa2Cu3Ox single crystals

Schlachter

Fietz²,

Grube³

et al. 1999

Physica C: Superconductivity

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We performed susceptibility measurements on Y 1-y Ca y Ba 2 Cu 3 O x single crystals under high He pressure. For each Ca content various samples with different oxygen contents have been prepared to probe the influence of Ca on T c (x), dT c /dp(x) and T c,max . Starting from the parabolic T c (n h ) behavior we calculated n h values from T c and T c,max for each sample. It is shown that in the overdoped region dT c /dp can be described by a pressure induced charge transfer with dn h /dp ≈ 3.7⋅10 -3 GPa -1 and a dT c,max /dp value of 0.8 K/GPa, irrespective of the Ca content. In the underdoped region additional pressure effects lead to a peak in dT c /dp at ≈0.11 holes/CuO 2 plane. However, with increasing Ca content this peak is strongly depressed. This is explained in terms of an increasing disorder in the CuO chain system due to doping. Deviations in dT c /dp at very low n h values can be assigned to the ortho II ordering in the CuO chain system.

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“…It is well known that the critical temperature in optimally doped YBCO couples most strongly to pure shear strain in the a-b plane [15]. In particular, the variation in the critical temperature depends linearly on the symmetric strain tensor ǫ α,β = (…”

Section: Strain/pinning Landscape About Materials Line Defects In Ybcomentioning

confidence: 99%

“…Pinning of vortex lines will be assumed to be due to variations in T c about columnar defects that in turn are a result of the strain field about them [15]. Heterogeneous columnar defects are thereby predicted that are composed of component lines of pins and of antipins of equal strength [16] [17].…”

Section: Introductionmentioning

confidence: 99%

Comparatively high in-field critical current in type-II superconductors from heterogeneous columnar pins: A molecular dynamics study

Rodriguez

Oswald

2009

Physica C: Superconductivity

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Theoretical work predicts that the strong dependence of T c on pure shear strain within the a-b plane of optimally doped YBa 2 Cu 3 O 7−δ results in heterogenous columnar pins of vortex lines about dislocation lines and about nano-columns inclusions aligned in parallel to the c axis. The critical current of a rigid vortex lattice driven by the Lorentz force in the presence of such clusters of pin/antipin lines is computed using two-dimensional (2D) collective pinning theory and by numerical simulation of the corresponding 2D vortex dynamics. Both theory and computer calculation find that the antipin component of the heterogenous columnar pins contributes substantially to the net in-field critical current.

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Effect of uniaxial stress on the superconducting transition inYBa2Cu3

Cited by 211 publications

References 21 publications

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

The effect of chemical doping and hydrostatic pressure on Tc of Y1−yCayBa2Cu3Ox single crystals

Comparatively high in-field critical current in type-II superconductors from heterogeneous columnar pins: A molecular dynamics study

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