Zobrazeno 1 - 10
of 52
pro vyhledávání: '"John K. Hulm"'
Publikováno v:
Physics Today. 34:34-43
In the golden research period immediately following World War II, the three of us took up research work in cryogenics and superconductivity. We were fortunate enough to make some discoveries in superconducting materials that laid the groundwork for n
Autor:
A. J. Panson, Aleksander I. Braginski, J. R. Gavaler, John K. Hulm, H. C. Pohl, J. Talvacchio, A. M. Stewart, M.A. Janocko, G. R. Wagner
Publikováno v:
Physical Review B. 35:8774-8777
Changes in the ratios of cations by \ensuremath{\sim}10% off the ${\mathrm{Y}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{8\mathrm{\ensuremath{-}}\mathrm{y}}$ composition demonstrated that a range of solid solutions exists in this mater
Autor:
John K. Hulm, B. T. Matthias
Publikováno v:
Physical Review. 87:799-806
Publikováno v:
Journal of Vacuum Science and Technology. 6:177-180
Transition metal interstitial compounds thin film preparation and superconducting properties, emphasizing high critical temperature, rock salt structure and NbN base
Publikováno v:
Physics Today. 24:48-57
Autor:
John K. Hulm, R.D. Blaugher
Publikováno v:
Journal of Physics and Chemistry of Solids. 19:134-138
The sigma and alpha-manganese structures formed by binary alloys between the group (V, Nb, Ta, Cr, Mo, W) and the group (Mn, Fe, Co, Ni, Ru, Rh, Pd, Re, Os, Ir, Pt) were investigated for superconductivity down to 1°K. Nineteen new superconductors we
Autor:
John K. Hulm, George F. Hardy
Publikováno v:
Physical Review. 93:1004-1016
About eighty transition metal compounds comprising borides, carbides, nitrides, oxides, silicides, and germanides of metals of Groups 4A, 5A, and 6A were tested for superconductivity down to 1.20\ifmmode^\circ\else\textdegree\fi{}K, using a magnetic
Publikováno v:
Journal of Physics and Chemistry of Solids. 21:252-255
Alloys in the titanium-molybdenum system were tested for superconductivity down to 1.0°K. Both the hexagonal titanium rich and the cubic molybdenum rich phases showed superconductivity. The transition temperature of the cubic alloys rose to a maximu
Autor:
Robert Gomer, John K. Hulm
Publikováno v:
The Journal of Chemical Physics. 27:1363-1376
The surface diffusion and adsorption of oxygen on tungsten have been studied by a field emission technique, by utilizing the high sticking coefficient, and negligible vapor pressure of O2 at 4.2–20°K. Three types of migration were noted. At ∼27
Autor:
Norman E. Phillips, R.D. Clear, John K. Hulm, C.K. Jones, R. Mazelsky, B. B. Triplett, H. E. Simon
Publikováno v:
Phillips, N.E.; Triplett, B.B.; Clear, R.D.; Simon, H.E.; Hulm, J.K.; Jones, C.K.; et al.(1969). LOW-TEMPERATURE HEAT CAPACITIES OF SUPERCONDUCTING DEGENERATE SEMICONDUCTORS. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/3c91z0s4
We have measured the low-temperature heat capacities of a number of samples of SnTe and SrTiO3 with varying carrier densities nc. For SnTe, the Debye temperature θD is practically independent of nc. The coefficient of the electronic heat capacity γ