Ferromagnetism and re-entrant spin-glass transition in quasicrystal approximants Au-SM-Gd (SM = Si, Ge)
2013 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 25, no 42, 426004- p.Article in journal (Refereed) Published
Magnetic susceptibility and specific heat measurements on quasicrystalline approximants Au–Si–Gd and Au–Ge–Gd reveal that a ferromagnetic (FM) transition occurs at Tc = 22.5(5) °K for Au–Si–Gd and at Tc = 13(1) °K for Au–Ge–Gd, which are the first examples of ferromagnetism in crystalline approximants. In addition, a re-entrant spin-glass (RSG) transition is observed at TRSG = 3.3 °K for Au–Ge–Gd in contrast to Au–Si–Gd. The different behaviors are understood based on the recent structural models reported by Gebresenbut et al (2013 J. Phys.: Condens. Matter 25 135402). The RSG transition in Au–Ge–Gd is attributed to a random occupation of the center of the Gd12 icosahedron by Gd atoms; a central Gd spin hinders the long-range FM order.
Place, publisher, year, edition, pages
IOP Publishing in Bristol, UK, 2013. Vol. 25, no 42, 426004- p.
Quasicrystal approximants, magnetic property, ferromagnetism
Condensed Matter Physics
Research subject Materials Science
IdentifiersURN: urn:nbn:se:uu:diva-209234DOI: 10.1088/0953-8984/25/42/426004ISI: 000325337700023OAI: oai:DiVA.org:uu-209234DiVA: diva2:656429