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), Vol. 32:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EUROPIUM ALLOYS
ELECTRIC CONDUCTIVITY
MAGNETIC SUSCEPTIBILITY
PHASE TRANSFORMATIONS
YTTERBIUM ALLOYS
BINARY ALLOY SYSTEMS
FERROMAGNETISM
MAGNETOSTRICTION
PARAMAGNETISM
PRESSURE DEPENDENCE
RUDERMAN-KITTEL COUPLING
ALLOY SYSTEMS
ALLOYS
COUPLING
ELECTRICAL PROPERTIES
MAGNETIC PROPERTIES
MAGNETISM
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RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties