First-Order Phase Transition to Strongly Anisotropic Ferromagnetism in Tl2Mo6Te6

Article Article scientifique Article First-Order Phase Transition to Strongly Anisotropic Ferromagnetism in Tl2Mo6Te6 eng 1984 author Pelizzone Marco 26345 author Lachal Bernard Marie 26381 author Meul H.W. author Treyvaud André 24784 author Muller Jean 24994 author Perrin A. 167-172 10.1016/0304-8853(84)90306-8 0304-8853 The magnetic susceptibility, magnetization, specific heat and electrical resistivity were measured on the new material Tl2Fe6Te6. All the data show a very sharp anomaly revealing a phase transition to ferromagnetism at Tc ≈ 220 K. The presence in the structure of one-dimensional metallic cluster ¦Fe3¦1∞ is evidenced by a very strong magnetic anisotropy in the ferromagnetic state, showing an interesting intermediate situation between a pure linear chain and 3-dimensional iron. Furthermore, the unusual sharpness of the transition leads us to anticipate a first-order phase transformation, but the lack of detectable thermal hysteresis was surprising. The molecular field model proposed by Bean and Rodbell in order to account for the similar behaviour of MnAs gives a close representation of our magnetic data. Thus, a pronounced dependence of the exchange interaction upon interatomic spacing may well be the dominant mechanism leading to the observed phenomena. Dewey 500.2 Dewey 333.7-333.9 18 Institut des sciences de l'environnement 0DB 33 Département de physique de la matière quantique 131 false 938 ISE Pôle Sciences 659 Systèmes énergétiques Journal of magnetism and magnetic materials 42 1 PHYP73 a94688df-f268-41bd-8bdc-7df794ecf240 Article (Published version) Restricted unige79279.pdf 3014637 application/pdf f25664a55cc1901eec3fafeb2527d92d3df9957e5cba8708ec608d6d00a39bce restrictedAccess Centres et instituts / Institut des sciences de l'environnement Faculté des sciences / Section de physique / Département de physique de la matière quantique

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First-Order Phase Transition to Strongly Anisotropic Ferromagnetism in Tl₂Mo₆Te₆	Journal of magnetism and magnetic materials			1984	435	1

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Treyvaud, André