Nuclear Magnetic Resonance and Magnetic Susceptibilities of V-Nb Alloys

Lam, D. J.; Spokas, J. J.; Ostenburg, D. O. Van

doi:10.1103/physrev.156.735

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…I n summary we conclude that with the values of 2 and A,, obtained in Table 1 an interpretation is possible of the Knight shift relaxation time in Nb-V [23] which is in line with a number of previously studied alloys with V or Nb [21, 26, 43, 441. …”

Section: Band Structuve Calculationssupporting

confidence: 68%

“…This has been done for V [24], with the result xUrb = 204 x 10-6e.m.u./mol or 0.70 xmeas. We take this value to be more reliable although it is considerably higher than often used values [21,23,251, based on neglecting the electron-phonon enhancement in the low temperature specific heat.…”

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 98%

“…Unfortunately in the case of Nb-V this method does not work as the susceptibility has been found not to vary with temperature below room temperature [23].…”

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 99%

“…f p l n is then given by (11) and the room temperature experimental susccptibility values [23j. We have used a slightly smoothed graph of the data points of [23] affecting appreciably only the 50 atyo V-value, which appeared to be somewhat low.…”

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 99%

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Spin Fluctuation Depressed Superconductivity in Nb‐V Alloys

Rapp

Crafoord

1974

Physica Status Solidi (b)

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The electrical resistivity of Nb-V alloys has been measured around 250 "C. Together with published values of the susceptibility and the electronic part of the specific heat the contribution of spin fluctuations t o the depression of the superconducting transition temperature, T,, has been estimated. A calculation of T, based on experimental resistivity, susceptibility, and specific heat and with one adjustable parameter shows qualitative agreement with the observed T, over the whole alloy system and reasonable quantitative agreement in the dilute B V region. Further evidence for the existence of spin fluctuations in Nb-V and a n enhanced electron-phonon coupling constant L in V is derived from the observed rate of depression of T, with V concentration, published band structure calculations for V, and published Knight shift relaxation times.La rksistivit6 des alliages Nb-V a kt6 determinire aux environs de 250 "C. Avec des valeurs publiees de la susceptibilitk et de la partie 6lectronique de la chaleur spkcifique on a estimk la contribution des fluctuations de spin ti la depression de la temperature de transition, T,. Un calcul de T, A partir de la rksistivitk, la susceptibilitk et la chaleur spkcifique expkrimentales et avec un parametre libre s'accord qualitativement avec la valeur de T, observke dans le systkme d'alliages entier e t est aussi en accord quantitatif raisonable dans la region dilut5e de mT7. Encore d'autre evidence pour l'existence des fluctuations de spin dans Nb-V et pour un couplage klectron-phonon klevk dans le V est obtenu par la depression observee de T , avec la concentration de V, la structure des bandes klectroniques publiees pour V et les temps de relaxation du systbme spin-r8seau.

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Section: Band Structuve Calculationssupporting

confidence: 68%

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 98%

“…Unfortunately in the case of Nb-V this method does not work as the susceptibility has been found not to vary with temperature below room temperature [23].…”

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 99%

Section: Separation Of Different Contributions To the Susceptibilitymentioning

confidence: 99%

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Spin Fluctuation Depressed Superconductivity in Nb‐V Alloys

Rapp

Crafoord

1974

Physica Status Solidi (b)

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Nuclear Magnetic Resonance and Susceptibility Measurements of Transition Metals and Alloys V‐Ta, V‐Nb, and Nb‐Ta Systems

Калантарян

Chechernikov

1976

Physica Status Solidi (b)

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The Knight shift of V51 and NbQ3 and the magnetic susceptibility have been measured in binary alloys of 3d, 4d, and 5d transition metals including vanadium, niobium, and tantalum. The experimental results and estimates of the various contributions to K and x show that the orbital contribution due to d-electrons is dominant in these alloys. In the calculations of the various contributions, both the electron-phonon interaction and s-d hybridization are taken into account. 1. Introduction I n order to interpret the magnetic properties of metals and alloys in terms of their electronic structures, the Knight shift K and the magnetic susceptibility x are important quantities. We have investigated the nuclear magnetic resonance -the Knight shifts of V5I and NbQ3 and the magnetic susceptibility in 3d, 4d, and 5d transition metal alloys, namely, in V-Ta, V-Nb, and Nb-Ta binary alloy systems. The Knight shift observed in transition metals and alloys is it sum of contributions resulting from orbital and core polarization interactions with the d-band electrons, as well as the s-contact interaction. The purpose of this paper is to find the composition dependence of K and x and to estimate the relative importance of various contributions to them. BThe first investigations of NMR properties and magnetic susceptibilities of the V-Nb system have been published in [l] but in their calculations and estimations of various contributions the electron-phonon interaction was not taken into account and measurements have been carried out only a t room temperature. In the present work the electron-phonon interaction is taken into account as well as the s-d hybridization.

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1.4.1.2 Ti and V alloys and compounds

Shiga¹

3d, 4d and 5d Elements, Alloys and Compounds

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Nuclear Magnetic Resonance and Magnetic Susceptibilities of V-Nb Alloys

Cited by 16 publications

References 24 publications

Spin Fluctuation Depressed Superconductivity in Nb‐V Alloys

Spin Fluctuation Depressed Superconductivity in Nb‐V Alloys

Nuclear Magnetic Resonance and Susceptibility Measurements of Transition Metals and Alloys V‐Ta, V‐Nb, and Nb‐Ta Systems

1.4.1.2 Ti and V alloys and compounds

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