Effect of Ta on the behavior of phonons in superconductors C-15 V/sub 2/Hf and V/sub 2/(Zr/sub 0. 5/Hf/sub 0. 5/)

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Chin. Phys.; (United States)

OSTI ID:7141393

Ji-zhou, Li; Zhu-qi, Li; Chun-tang, Ye; Qian-kun, Li; Zhi-tao, Zheng; Li, Zhou; Dao-le, Yin

Inelastic neutron scattering spectra from C-15 phase superconducting alloys V/sub 2/Hf, V/sub 2/Ta, V/sub 2/Hf/sub 0.8/Ta/sub 0.2/, V/sub 2/Zr/sub 0.5/ Hf/sub 0.5/, and V/sub 2/Zr/sub 0.5/Hf/sub 0.33/Ta/sub 0.17/ were measured by the neutron time-of-flight method, and their relative phonon densities of states were evaluated. The present results show that the phonon frequencies soften with an increase of the superconducting transition temperature T/sub c/, and harden with a decrease of the T/sub c/, which is in agreement with our previous results in our paper ''The effect of Nb on phonons of superconductors C-15 V/sub 2/Zr and V/sub 2/(Zr/sub 0.5/Hf/sub 0.5/).''/sup 1/ This means that for these superconductors the elastic softening plays a role in enhancing T/sub c/ to some extent. It seems that between V/sub 2/Zr or V/sub 2/Hf and V/sub 2/(Zr/sub 0.5/Hf/sub 0.5/) there exists an essential difference, which causes T/sub c/ to increase and the phonon frequencies to soften for the former, while T/sub c/ decreases and the phonon frequencies harden slightly for the latter after adding small amounts of Nb or Ta. This can be considered to be the result of hybridization of conduction bands, which is studied by means of the LMTO (linear combination of muffin-tin orbitals) method./sup 12/

• Research Organization: Institute of Atomic Energy, Academia Sinica
• OSTI ID: 7141393
• Journal Information: Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 6:4; ISSN CHPHD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COHERENT SCATTERING
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HAFNIUM ALLOYS
NEUTRON DIFFRACTION
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SCATTERING
SUPERCONDUCTIVITY
TANTALUM ALLOYS
THERMODYNAMIC PROPERTIES
TIME-OF-FLIGHT METHOD
TRANSITION TEMPERATURE
VANADIUM ALLOYS
ZIRCONIUM ALLOYS