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DPG

Hamburg 2001 – scientific programme

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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

Tuesday, March 27, 2001, 14:45–19:00, Foyer S 3

Phase diagram of the quasi one-dimensional antiferromagnet CsNi1−xFexCl3 with easy-plane anisotropy induced by impurities — •Klaus Kiefer1, Jürgen Wolf1, Maikel C. Rheinstädter1, and Mechthild Enderle1,21Technische Physik, Universität des Saarlandes, Saarbrücken, Germany — 2Institut Laue Langevin, Grenoble, France

The magnetic phase diagrams of the Fe2+ doped hexagonal ABX3 compounds CsNi0.98Fe0.02Cl3 and CsNi0.9Fe0.1Cl3 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.

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