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Author Kitazawa, H. ♦ Doenni, A. ♦ Tang, J. ♦ Kido, G. ♦ Keller, L. ♦ Fauth, F.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MAGNETIC PROPERTIES ♦ CERIUM ALLOYS ♦ PRASEODYMIUM ALLOYS ♦ NEODYMIUM ALLOYS ♦ PLATINUM ALLOYS ♦ ALUMINIUM ALLOYS ♦ ANISOTROPY ♦ FERROMAGNETISM ♦ TEMPERATURE DEPENDENCE ♦ EXPERIMENTAL DATA
Abstract The rare-earth (R) platinum aluminides RPtAl crystallize in the orthorhombic TiNiSi-type structure (space group Pnma, Z = 4), where magnetic rare-earth atoms form a network of chains parallel to the a-axis and parallel to the b-axis. Magnetic structures and phase transitions of RPtAl (R = Ce, Pr, Nd) compounds were investigated by systematic measurements of magnetic susceptibility, specific heat, and neutron diffraction on polycrystalline samples. The results reveal a large magnetocrystalline anisotropy and magnetic structures that are dominated by a ferromagnetic component parallel to one of the two chain directions: the a-axis for CePtAl and PrPtAl and the b-axis for NdPtAl. The complex magnetism of CePtAl with three successive magnetic phase transitions ({Tc} = 5.9 K, T{sub 2} = 4.3 K, T{sub 3} = 2.5 K) and two coexisting propagation vectors (k{sub 1} = 0 for T {le} {Tc}, k{sub 2i} = [0, 0.46, 0] for T{sub 2} {le} T {le} {Tc}, k{sub 2} = [0, 1/2, 0] for T {le} T{sub 2}) is confirmed to be exceptional among RPtAl compounds. PrPtAl has a nonmagnetic crystalline-electric field (CEF) ground-state singlet separated by 21 K from the first-excited state CEF singlet and magnetic exchange interactions are strong enough to induce long-range magnetic order (Curie temperature {Tc} = 5.8 K, propagation vector k{sub 1} = 0, magnetic group Pnm{prime}a{prime}, ordered saturation moment m{sub 1} = 1.00(7) {mu}{sub B}). NdPtAl is a simple ferromagnet ({Tc} = 19.2 K, k{sub 1} = 0, Pn{prime}ma{prime}, m{sub 1} = 2.08(4) {mu}{sub B}).
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1998-11-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 140
Issue Number 2


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