Atomic Heats of Normal and Superconducting Vanadium

Corak, W. S.; Goodman, B.B.; Satterthwaite, C. B.; Wexler, Aaron

doi:10.1103/physrev.102.656

Cited by 117 publications

(18 citation statements)

References 17 publications

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“…Thus only isotropic correction (Zachariasen, 1967) Cromer & Liberman (1970) were employed. The temperature factor U is 0.00758 (1)/~z, from which the Debye characteristic temperature is derived to be 340 K, in good agreement with 338 K obtained from a low-temperature specific-heat study (Corak, Goodman, Satterthwaite & Wexler, 1956). It is slightly higher than the 323 K determined from the neutron phonon frequency spectrum (Stewart & Brockhouse, 1958;Weiss & DeMarco, 1965), and lower than the 372 K from the powder X-ray measurement (Linkoaho, 1971).…”

Section: Introductionsupporting

confidence: 56%

An X-ray measurement of charge asphericity in vanadium metal

Ohba¹,

Sato²,

Saito³

1981

Acta Cryst Sect A

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TAKASHI KOBAYASHI, YOSHINORI FUJIYOSHI, FUMIO IWATSU AND NATSU UYEDA 697 these crystals may vary easily with the conditions of crystal growth. The lattice energy and the crystal surface energy become of comparable size in such small crystals and therefore the interaction force acting between the crystal or molecules and the substrate is able to have an effect to some extent on the growth process.The authors wish to express their thanks to Dr K. Ishizuka for providing a computer program for image simulations. Thanks are also due to Mr M. Tsuji for his kind assistance.References ADACHI, K., ADACHI, M., KATOH, M. & FUKAMI, A. (1968).J. Electron Microsc. 17, 280. ASHIDA, M., UYEDA, N. & SUITO, E. (1966). Bull. Chem. Soc. Jpn, 39, 2616-2624. BROWN, C. J. (1968. J. Chem. Soc. A, 2488Soc. A, -2493Soc. A, , 2494Soc. A, -2498. CLARK, W. R. K., CHAPMAN, J. N. & FERRIER, R. P. (1979).Nature (London), 277, 369-370.FUJIYOSHI, Y., KOBAYASHI, T., ISHIZUKA, K., UYEDA, N., ISHIDA, Y. & HARADA, Y. (1980 For b.c.c, vanadium metal the integrated intensities of 80 independent reflections were measured by using a spherically shaped single crystal 0.241 (3) mm in diameter with Ag Ka radiation. It was confirmed that there are very small differences in integrated intensities between paired reflections, and these differences can be measured significantly beyond the experimental error. The ratios of the paired reflections are smaller than those obtained from platy crystals [Weiss & DeMarco (1965). Phys. Rev. A, 140, 1223-1225 but are in good agreement with those recalculated recently by means of the APW method [Wakoh & Kubo (1980 There is asphericity of the charge distribution around atoms in b.c.c. 3d metals and this causes a slight difference in the X-ray scattering factors for paired reflections having the same sin 0/2, such as 442 and 600. Weiss & DeMarco (1965) attempted to detect the integrated intensity differences of the paired reflections using transmission with Mo Ka radiation for a vanadium single-crystal plate 0.1 mm in thickness and perpendicular to [110]; they obtained the ratios listed in Table 1. The experimental ratios were much larger than the theoretical values calculated by employing the Green-function method (Wakoh & Yamashita, 1971). Diana & Mazzone (1975) This value agreed well with the 3.0285 A measured for the powder specimens at 300 K (Korhonen, Rantavuori & Linkoaho, 1971). The crystal data are listed in Table 2, together with the experimental conditions. In total, 1249 reflections in the hemisphere of reciprocal space (l > 0) up to 20 = 150 ° were collected with co scans. Backgrounds were measured by stationary counts on each side of the peaks. The time ratio between background and peak was always greater than 1/3. In the measurement of the lowest five reflections, 110, 200, 211, 220 and 310, Ni-foil attenuators were inserted to make the peak intensity lower than 6000 counts s -1. Their attentuation factors are in the range from 1.3 to 4.1; these were determined from the least squares and their standar...

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Section: Introductionsupporting

confidence: 56%

An X-ray measurement of charge asphericity in vanadium metal

Ohba¹,

Sato²,

Saito³

1981

Acta Cryst Sect A

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“…This value is shown as the first number in the α th column of has to be corrected for the superconducting gap in the electronic quasiparticle spectrum. 30 The phonon-escape times are evaluated for a NbLHe and for a Au-LHe interface for various layer thicknesses. V N b and VAu are the volumes of the Nb electrodes and the additional Au layer on top of the junction.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Improved Nb SIS devices for heterodyne mixers between 700 GHz and 1.3 THz with NbTiN transmission lines using a normal metal energy relaxation layer

Westig

Selig

Jacobs

et al. 2013

Journal of Applied Physics

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In this paper we demonstrate experimentally the implementation of a niobium-trilayer junction with an aluminum-oxide tunnel barrier, embedded in a high-gap superconducting niobium-titanium-nitride circuit. Previously reported heating by quasiparticle trapping is removed by inserting a normal metal layer of gold between the niobium junction and the niobium-titanium-nitride layer. We analyze in dc-characterization measurements the cooling of the nonequilibrium quasiparticles in various device geometries having different gold layer thickness and shape. Our work is concluded with remarks for future heterodyne mixer experiments using our device technology.

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“…(21). An attempt to fit the data of La III to the corresponding relation, C es = xy a T a ae~b T^T +(l-x)y^T^ae-hT^T , (22) …”

mentioning

confidence: 99%

Normal and Superconducting Heat Capacities of Lanthanum

1958

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The heat capacities of three samples of lanthanum have been measured in the temperature range 1.6 to to 6.5°K. A four-constant formula was found which represented to high precision the resistance-temperature relation of the carbon composition resistance thermometer from 1.6 to 7.2°K. Two superconducting transitions were found in each sample: one at 4.8°K and the other at 5.9°K. These are associated respectively with the hexagonal close-packed and face-centered cubic modifications of the metal. Below 2.5°K, a magnetic field of 10 000 gauss was found insufficient to quench completely the superconducting phase. The values of the normal heat capacity constants for the purest sample, averaged over the two crystal structures present, were determined by a thermodynamic analysis of the data to be y = (24.1 ±0.6) X10~4 cal/mole (°K) 2 , 0=142±3°K. The data are further analyzed for evidence of a law of corresponding states among superconductors.

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Atomic Heats of Normal and Superconducting Vanadium

Cited by 117 publications

References 17 publications

An X-ray measurement of charge asphericity in vanadium metal

An X-ray measurement of charge asphericity in vanadium metal

Improved Nb SIS devices for heterodyne mixers between 700 GHz and 1.3 THz with NbTiN transmission lines using a normal metal energy relaxation layer

Normal and Superconducting Heat Capacities of Lanthanum

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