Superconductivity of ternary borides

Conference · Sat Jan 01 04:00:00 EST 1977 · Int. J. Quant. Chem., Symp.; (United States)

OSTI ID:5280994

Matthias, B T

A second superconducting ternary system of the form: XRh/sub 4/B/sub 4/ with X = Y, Nd, Sm, Er, Tm, Lu, and Th is now discovered in the last year. This phase is tetragonal and also forms with X = Gd, Tb, Dy, and Ho. The comparison of these new superconducting borides with the superconducting sulfides and selenides leads immediately to the rather astonishing conclusion that these ternary superconducting compounds with fairly high transition temperatures usually have the form A/sub x/B/sub y/C/sub z/ with x much less than y, x much less than z, and y approximately z. In other words, the third element A while entirely essential for the formation of the correct phase is, nevertheless, only a minor constituent or perturbation. Only very few superconducting compounds and no systems for which x, y, and z are comparable to one another whatsoever exist. The role of the minority element is also illustrated by the fact that in both systems, superconducting compounds with magnetic rare earth elements exist.

• Research Organization: Univ. of California, San Diego
• OSTI ID: 5280994
• Conference Information: Journal Name: Int. J. Quant. Chem., Symp.; (United States) Journal Volume: 11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORIDES
BORON COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE