Pressure dependence of the weak itinerant ferromagnetism of Y(Co1-xAlx)2 |
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| Authors: | J G M Armitage R G Graham P C Riedi |
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| Institution: | J F Allen Research Laboratories, Department of Physics and Astronomy , University of St Andrews , Fife, KY16 9SS, Scotland, UK |
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| Abstract: | Abstract Y(Co1-xAlx)2 is a weak itinerant ferromagnet for 0.12 < x < 0.20 with a maximum Curie point of about 25 K near x = 0.15. The pressure dependence of the Curie point for samples with 0.14 < x < 0.18 was measured in the temperature and pressure range 5–25 K and 0–8 kbar using a liquid filled lock cell. It was found that Tc was linear in pressure and extrapolated to OK at Pc = 9 ± 1 kbar for all samples. The volume expansion from YCo2 to x = 0.15 is equivalent to a chemical pressure of -40 kbar so ferromagnetism cannot occur at the lattice constant of YCo2. |
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