Model to Explain Large Changes in the Electronic Density of States with Atomic Ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Au

Labbé, J.; Reuth, E.C. van

doi:10.1103/physrevlett.24.1232

Cited by 84 publications

(9 citation statements)

References 6 publications

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“…Measurements on VsSi and VsGe (Testardi, 1972) show that the thermal expansion approximately follows a lnT temperature dependence. This is the same temperature dependence found for c, and for dc, /dp in nontransforming crystals (Larsen and Ruoff, 1973). A theoretical explanation of this temperature dependence for c, has been offered by Weger (private communication) and by Gorkov (1973a, b (Chu and Testardi,19'l4).…”

Section: Yi Strain Dependence Of the Elastic Behavior' Anharmonicitysupporting

confidence: 55%

“…These interesting ex- (B) Volume strain effects: The volume dependence of the VsSi elastic moduli has been studied by Carcia et ul. (1971), Larsen and Ruoff (1973), and Carcia and Barsch (1973). The results show that at room temperature the bulk.…”

Section: Yi Strain Dependence Of the Elastic Behavior' Anharmonicitymentioning

confidence: 84%

“…degree of order (see, for example, Blaugher et a/. , 1969, andVan Reuth, 1970). The microscopic defect state of the samples is also generally unknown.…”

Section: The A-15 Structurementioning

confidence: 99%

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Structural instability and superconductivity in A-15 compounds

Testardi¹

1975

Rev. Mod. Phys.

372

176

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Structural instabilities are now being found in many high-temperature superconductors. Compounds with the A-15 (P-W) structure comprise the most important group of these materials, and their properties have been extensively studied for over 15 years. A review is given of some of these results, particularly those relating to the elastic behavior. The empirical relation of the structural instability and the anharmonicity to the high superconducting transition temperature is discussed. CONTENTS

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Section: Yi Strain Dependence Of the Elastic Behavior' Anharmonicitysupporting

confidence: 55%

Section: Yi Strain Dependence Of the Elastic Behavior' Anharmonicitymentioning

confidence: 84%

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Structural instability and superconductivity in A-15 compounds

Testardi¹

1975

Rev. Mod. Phys.

372

176

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“…This destabilizing d-electron contribution is one, however, which increases with decreasing temperature as the Fermi surface becomes sharper. From the 1960s to the 1980s Jacques Friedel was collaborating with Jacques Labbé, and Slaven Barišić [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]19]. They studied the instability of the cubic phase of intermetallic compounds of the type V 3 Si at very low temperature.…”

Section: Friedel Et Al Work On Supraconductivity and Van Hove Singulmentioning

confidence: 99%

Superconductivity and the Van Hove Scenario

Bok

Bouvier

2012

J Supercond Nov Magn

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We give a review of the role of the Van Hove singularities in superconductivity. Van Hove singularities (VHs) are a general feature of low-dimensional systems. They appear as divergences of the electronic density of states (DOS). Jacques Friedel and Jacques Labbé were the first to propose this scenario for the A15 compounds. In NbTi, for example, Nb chains give a quasi-1D electronic structure for the d-band, leading to a VHs. They developed this model and explained the high T C and the many structural transformations occurring in these compounds. This model was later applied by Jacques Labbé and Julien Bok to the cuprates and developed by Jacqueline Bouvier and Julien Bok. The high T C superconductors cuprates are quasibidimensional (2D) and thus lead to the existence of Van Hove singularities in the band structure. The presence of VHs near the Fermi level in the cuprates is now well established. In this context we show that many physical properties of these materials can be explained, in particular the high critical temperature T C , the anomalous isotope effect, the superconducting gap and its anisotropy, and the marginal Fermi liquid properties, they studied these properties in the optimum and overdoped regime. These compounds present a topological transition for a critical hole doping p ≈ 0.21 hole per CuO 2 plane.

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“…The variation of T c with the atomic order parameter was theoretically studied by Appel [19] and Labbé and Van Reuth [20]. Since the data about the order parameter S of Nb 3 Sn after irradiaton at 1.38 × 10 21 p/m 2 are not yet available, it is at present not possible to state whether the linear decrease of T c within this fluence is uniquely due to a change of S. The transition width of T c does not change after high energy proton irradiation up to 1.38 × 10 21 p/m 2 reflecting that the damage induced in the A15 matrix is homogeneously distributed.…”

Section: A the Linear Decrease Of T C With Proton Irradiationmentioning

confidence: 99%

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Spina

Scheuerlein

Richter

et al. 2015

IEEE Trans. Appl. Supercond.

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A recent proton irradiation study on Ta and Ti alloyed industrial multifilamentary Nb 3 Sn wires has now been extended to fluences up to 1.38 × 10 21 p/m 2 , the Bragg peak region being located outside of the wire. In the present work, magnetization measurements were performed up to 14 K and 10 T, to follow and determine with more precision the development of the upper critical field B c2 with fluence. It was found that the critical temperature, T c , decreases linearly with increasing fluences, about 3% up to the highest fluence 1.38 × 10 21 p/m 2 . The transition width does not change after irradiation, thus reflecting a homogeneous damage in analogy to neutron irradiation. Both the critical current density, J c , and the upper critical field, B c2 , were found to increase in the considered fluence range. It was obtained that the larger enhancement of J c , (about 45% for Ta alloyed wires and 100% for Ti alloyed wires at 10 T) is not correlated to that of B c2 (about 5% for Ti alloyed and 10% for Ta alloyed up to the highest fluence). The enhancement of J c in Ta alloyed wires is very similar for both PIT and RRP processing, thus assigning a major importance to the nature of the additive. The present results after irradiation were analysed applying the two-mechanism model on the volume pinning force, taking into account both grain boundary pinning and point pinning. A comparison between the present results and those achieved after neutron irradiation on the same Nb 3 Sn wires shows that protons cause considerably higher damage than neutrons: the same effect on J c and T c is already observed at fluences being one order of magnitude smaller.Index Terms-Bragg-Williams LRO parameter, flux pinning induced by proton irradiation, HL-LHC upgrade, magnetization, radiation damage.

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Model to Explain Large Changes in the Electronic Density of States with Atomic Ordering inV3Au

Cited by 84 publications

References 6 publications

Structural instability and superconductivity in A-15 compounds

Structural instability and superconductivity in A-15 compounds

Superconductivity and the Van Hove Scenario

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

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