Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.22: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Field and temperature dependence of spin fluctuations in ZrZn2 — •Pascal Reiss, Yang Zou, Gilbert G. Lonzarich, and F. Malte Grosche — Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
ZrZn2 is a low temperature band ferromagnet (Tc ≈ 28 K), which displays non-Fermi liquid transport properties over a wide temperature range: above TFL ≈ 1 K and up to Tc, the electrical resistivity follows a power-law temperature dependence with an exponent 5/3, whereas the electronic contribution to the thermal resistivity is linear in temperature. This has been explained in terms of a a magnetic fluctuation model, which includes a self-consistent renormalisation for the magnetic susceptibility [1, 2].
Applied magnetic fields up to 8 T have been observed to increase the cross-over temperature TFL to ∼ 6 K. Previous calculations did not include effects of magnetic fields. Here, we will present the results of an extended calculation, which accounts for the role of applied field, allowing a comparison between high field resistivity measurements and the predictions of a magnetic fluctuation model.
[1] G. G. Lonzarich and L. Taillefer, J Phys C: Solid State Phys 18, 4339-4371 (1985)
[2] R. Smith et al., Nature 455, 1220-1223 (2008)