Superconductivity of Lanthanum Foils and of Vapor Deposited Lanthanum Films with Addition of Gadolinium

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Z. Physik

DOI:https://doi.org/10.1007/BF01377931· OSTI ID:4711372

Schwidtal, K

Foils of lanthanum were found to be converted entirely to the hcp modification by the rolling process. This made it possible to obtain the superconducting transition temperatures for both the hcp and fcc modifications of lanthanum from measurements of the electrical resistivity. Lanthanum foils in the hcp form exhibited a superconducting transition at 4.9 deg K, while foils in the fcc form became superconducting at 6.0 deg K. Cold working lowered the transition temperature of the hcp modification. Quenching condensation provided films of the hcp modification, their transition temperature being depressed by the quenching condensation. Small additions of gadolinium lowered the transition temperatures as well of the quenchingly condensed as of the annealed films at the same rate of 4.5 deg K per at% Gd. From the accordance of these rates it is concluded that the lowering of the transition temperature by paramagnetic impurities is not affected by quenching condensation. The results of the measurements on La-Gd films are also in accord with those of Matthias et al. obtained on bulk specimens.

• Research Organization: Universitat, Gottingen, Ger.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-011251
• OSTI ID: 4711372
• Journal Information: Z. Physik, Journal Name: Z. Physik Vol. Vol: 169
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ANNEALING
COLD WORKING
COOLING
ELECTRIC CONDUCTIVITY
FILMS
GADOLINIUM
GADOLINIUM ALLOYS
IMPURITIES
LANTHANUM
LANTHANUM ALLOYS
LATTICES
LIQUEFYING
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
ROLLING
SHEETS
SPUTTERING
SUPERCONDUCTIVITY
TRACE AMOUNTS
VAPORS