Pressure study of the magnetic and electrical properties of the Eu-Yb alloy system
Measurements of the ac magnetic susceptibility, magnetization, and electrical resistivity at hydrostatic pressures up to 15 kbar and of the thermal expansion were made for the Eu/sub x/Yb/sub 1-x/ alloy system (x less than or equal to 0.4) in temperatures from 1.6 to 400 K. The paramagnetic-ferromagnetic transition temperature T/sub c/ versus pressure p curve for x = 0.025 has a maximum near p = 1 kbar. For x = 0.25, T/sub c/ decreases and the ferromagnetic--spin-glass-like transition temperature T/sub t/ increases at rates of ..delta..T/sub c//..delta..p = -9.5 K/kbar and ..delta..T/sub t//..delta..p = +1.7 K/kbar, respectively. The ferromagnetic region disappears near p = 2.5 kbar, and above it the paramagnetic--spin-glass-like transition temperature T/sub g/, which is pressure insensitive, appears. The T/sub g/ value for x = 0.35 decreases initially and increases slowly with increasing p above p = 2 kbar at a rate of ..delta..T/sub g//..delta..p = +0.15 K/kbar. Both the magnetization in the ferromagnetic concentration range and the value of the ac magnetic susceptibility near T/sub g/ in the spin-glass-like state decrease with increasing p. From electrical-resistivity measurements under various pressures, semiconducting character was observed at the ambient pressure for x = 0.35 and the transition from semimetallic to semiconducting states appears with increasing p for x = 0.025. Thermal expansion shows the large positive volume magnetostriction.
- Research Organization:
- Faculty of Science, Hiroshima University, 1-1-89 Higashisenda, Hiroshima 730, Japan
- OSTI ID:
- 6324370
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 32:11; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
COUPLING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EUROPIUM ALLOYS
FERROMAGNETISM
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETOSTRICTION
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RARE EARTH ALLOYS
RUDERMAN-KITTEL COUPLING
YTTERBIUM ALLOYS