IngentaConnect Magnetic phase transitions in compounds

Authors: Liu W.¹; Sun X.K.¹; Zhang Z.D.¹; Wang J.L.²; Zhao T.¹; Xiao Q.F.¹; Brck E.³; Boer F.R.d.³; Grssinger R.⁴

Source: Journal of Physics: Condensed Matter, Volume 10, Number 2, 1998 , pp. 379-388(10)

Publisher: Institute of Physics Publishing

Abstract:

Spin-reorientation transitions in compounds have been studied by measuring the temperature dependence of the a.c. susceptibility and the magnetization. The angular dependence of the magnetization on the applied field was measured on magnetically aligned samples in a SQUID magnetometer. In , the easy magnetization direction at room temperature was determined by x-ray diffraction to be the c-axis; at low temperatures, the SQUID measurements show a cone to be stable. At temperatures between 170 and 250 K, the SQUID measurements display more complex behaviour, which is attributed to the occurrence of a first-order magnetization process in this compound. The easy magnetization direction of compounds with changes from easy c-axis at high temperatures via a basal plane to easy cone at low temperatures. The magnetic phase diagram of the system is given. For , the critical field of the FOMP transition below 230 K, which corresponds to the critical temperature of the first-order transition, and the anisotropy fields at temperatures ranging from 240 to 300 K have been further investigated by means of the SPD technique.

Language: English

Document Type: Miscellaneous

Affiliations: 1: Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China 2: Institute of Physics, Academia Sinica, PO Box 603, Beijing 100080, People's Republic of China 3: Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands 4: Institute for Experimental Physics, Technical University of Vienna, Wiedner-Hauptstra?e 8-10, A-1040 Vienna, Austria

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