Anisotropic magnetic and transport properties of UNiGe
- Univ. of Amsterdam (Netherlands). Van der Waals-Zeeman Lab.
- Charles Univ., Prague (Czech Republic). Dept. of Metal Physics
- Hahn-Meitner-Inst., Berlin (Germany)
Magnetism in UNiGe which adopts the orthorhombic TiNiSi type of structure with lattice constants a = 700.7 pm, b = 423.7 pm, c = 720.7 pm is strongly anisotropy. The Curie-Weiss behavior of the susceptibility above 90 K yields values of {Theta}{sub p} equal to {minus}98, 3 and 41 K for the a, b and c axis, respectively. Also the electrical resistivity is anisotropic and reflects magnetic phase transitions at 41.5 and 50 K, in very good agreement with specific-beat data. An antiferromagnetic structure of U moments of about 1.4 {mu}B with a propagation vector q = (0, 0.5, 0.5) can be concluded from neutron-diffraction studies at low temperatures. Two metamagnetic transitions are observed in high-field magnetization data at 4.2 K in fields applied along the b (at 17 and 25 T) and c (at 3 and 10 T) axes yielding parallel alignment of the magnetic moments in fields above the second transition. The magnetization measured at 35 T amounts to 1.45 {mu}{sub B}/fu. The huge magnetic anisotropy is reflected in the weak linear magnetic response to fields along the a axis yielding only 0.23 {mu}{sub B}/f.u. at 35 T. The destruction of antiferromagnetic ordering in high fields is accompanied by a reduction of about 80% of the electrical resistivity. The huge magnetic anisotropy and giant magnetoresistance which is also observed in other UTX compounds (T = transition metal, X = P-metal) can be understood in terms of anisotropic 5f-ligand hybridization.
- OSTI ID:
- 40272
- Report Number(s):
- CONF-930860-; ISSN 0018-9464; TRN: IM9520%%467
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 30, Issue 2Pt2; Conference: EMMA `93: 5th European magnetic materials and applications conference, Kosice (Slovakia), 24-27 Aug 1993; Other Information: PBD: Mar 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
Incommensurate antiferromagnetic phase in UNiGe
Magnetic phases in UNiGe