Hamburg 2001 – wissenschaftliches Programm

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AM: Magnetismus

AM 9: Poster: Magnetowid. (1-17), Dü. Schichten (18-34), Oberfl
ächenmag. (35,36), Mikr. Methoden (37-45), Mikromag. (46-58), Phasenüberg. (59-77), Spektroskop. (78-91), Nanokr.Mat.(92-96), Anisotrop. (97-101), Schmelzen(102-104),Sonst/postdeadl.(105-109)

AM 9.71: Poster

Dienstag, 27. März 2001, 14:45–19:00, Foyer S 3

Phase diagram of the quasi one-dimensional antiferromagnet CsNi_1−xFe_xCl₃ with easy-plane anisotropy induced by impurities — •Klaus Kiefer¹, Jürgen Wolf¹, Maikel C. Rheinstädter¹, and Mechthild Enderle^1,2 — ¹Technische Physik, Universität des Saarlandes, Saarbrücken, Germany — ²Institut Laue Langevin, Grenoble, France

The magnetic phase diagrams of the Fe²⁺ doped hexagonal ABX₃ compounds CsNi_0.98Fe_0.02Cl₃ and CsNi_0.9Fe_0.1Cl₃ are investigated measuring the heat capacity and the magnetocaloric effect. Considering the large amount of impurity ions, the phase boundaries appear surprisingly well-defined. This proves that doping is an effective means to manipulate the anisotropy in the quasi one-dimensional ABX₃ compounds. We observe the same phase sequence in both samples, including the new umbrella phase, and discuss the effective anisotropies.