TlCu1.73Fe0.27Se2 studied by means of Mössbauer spectroscopy and SQUID magnetometry
2006 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 18, no 31, 7373-7382 p.Article in journal (Refereed) Published
TlCu2-xFexSe2 is a p-type metal for x < 0.5 which crystallizes in a body-centred tetragonal structure. The metal atoms are situated in ab-planes, similar to 7 angstrom apart, while the metal - metal distance within the plane is similar to 2.75 angstrom. Due to the large difference in cation distances, the solid solutions show magnetic properties of mainly two-dimensional character. The SQUID measurements performed for x = 0.27 give the c-axis as the easy axis of magnetization, but also show clear hysteresis effects at 10 K, indicating a partly ferromagnetic coupling. The magnetic ordering temperature T-c is 55( 5) K as found from both SQUID and Mossbauer spectra. At T << Tc the magnetic hyperfine fields are distributed with a maximum at about 30 T, which are compared to the measured magnetic moment per iron atom, which is 0.97 mu(B)/Fe as found from SQUID measurements. The experimental results are compared to results using other methods on isostructural Tl selenides.
Place, publisher, year, edition, pages
2006. Vol. 18, no 31, 7373-7382 p.
Physical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-93790DOI: 10.1088/0953-8984/18/31/029ISI: 000239525800033OAI: oai:DiVA.org:uu-93790DiVA: diva2:167381