Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.149: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Dilatometry under magnetic field of the magnetic quasicrystal Zn-Mg-Tb — •William Knafo1,2, Christoph Meingast1, Paul Popovich1, Hilbert von Löhneysen1,2, Hiroyuki Takakura3, and Akira Inaba3 — 1Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany. — 2Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany. — 3Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
The magnetic quasicrystal Zn-Mg-Tb is characterized by a freezing
temperature Tf≃ 6 K below which the moments localized on
the Tb sites follow a spin glass behavior [1]. Short range
magnetic correlations have also been reported below a second
characteristic temperature Tcorr≃ 20 K [2]. The spin
freezing behavior of Zn-Mg-Tb is probably related to the set up of
competing magnetic correlations, such as in the Kagomé or
pyrochlore geometrically frustrated systems. We present here a
study of the magnetic quasicrystal Zn-Mg-Tb using thermal
expansion and magnetostriction for magnetic fields up to 10 T. The
effects of the temperature and magnetic field on the magnetic
correlations will be related to those measurements.
[1] T. J. Sato, Acta Cryst. A 61, 39 (2005). [2] Z. Islam et al., Phys. Rev. B 57, R11047 (1998).