Neutron powder diffraction experiments and magnetization measurements have been carried out on the intermetallic compound Ce4Ge3 (Cubic, Th3P4-type). The neutron diffraction data obtained in zero field at 2 K, reveal commensurate antiferromagnetic ordering with magnetic moments of Ce directed along (0 0 1) axis (MCe = 1.55(4) μB) whereas the magnetization data depict two magnetic transitions at ∼12 K and at ∼6 K, respectively. Isothermal magnetization data obtained at 2 K present complex metamagnetic transition with two plateaus corresponding to magnetic moment values of ∼0.35μB/Ce3+ in 2 T and ∼0.94 μB/Ce3+ in 9 T field. © 2009 Elsevier B.V. All rights reserved.

R. Nirmala

Department Of Physics

Antiferromagnetic orderings

Intermetallic compounds

Isothermal magnetization

Magnetic transitions

Magnetization data

Magnetization measurements

Metamagnetic transitions

NEUTRON DIFFRACTION DATA

RARE EARTH INTERMETALLIC COMPOUNDS

RARE EARTH INTERMETALLIC COMPOUNDS AND ALLOYS

ZERO FIELDS

Antiferromagnetism

Cerium

Cerium alloys

CERIUM COMPOUNDS

Germanium

Magnetic moments

Magnetic properties

magnetic structure

Magnetization

Magnets

Nanocrystalline alloys

Neutron diffraction

Neutrons

Rare earths

Semiconducting intermetallics

SOLDERING ALLOYS

Magnetic materials

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Alloys and Compounds

The Th3P4-type Ce3Te4 and Nd3Te4 compounds (space group I43d, N° 220) have been investigated by means of magnetization and neutron powder diffraction. The magnetization measurements indicate that Ce3Te 4 and Nd3Te4 order ferromagnetically at ∼5 K and ∼38 K. Neutron diffraction experiments in zero fields show that below their magnetic transition temperatures the Ce3Te4 and Nd3Te4 compounds exhibit a collinear ferromagnetic type ordering with the C3v magnetic point group (wave vector K0 = [0, 0, 0]). Magnetic moment values of 0.66(6) μB/Ce and 2.4 μB/Nd are obtained from the analysis of neutron diffraction data at 1.5 K for Ce3Te4 and Nd3Te4. The earlier reported magnetic structures of the anti-Th3P 4-type Ce4Ge3, Ce4Sb3, Pr4Sb3 and Nd4Sb3 compounds were re-refined and re-assigned in terms of magnetic point groups. © 2011 Elsevier Ltd. All rights reserved.

Intermetallics

Magnetic ordering of anti-Th3P4-type R 4X3 and Th3P4-type R 3X4 compounds (R = Ce, Pr, Nd, Sm, X = Ge, Sb, Te)

Magnetization and neutron diffraction studies have been performed on Ce4Sb3 compound (cubic Th3P4-type, space group I4̄3d, no. 220). Magnetization of Ce4Sb3 reveals a ferromagnetic transition at ∼5 K, the temperature below which the zero-field-cooled and field-cooled magnetization bifurcate in low applied fields. However, a saturation magnetization (Ms) value of only ∼0.93μB/Ce3+ is observed at 1.8 K, suggesting possible presence of crystal field effects and a paramagnetic/antiferromagnetic Ce3+ moment. Magnetocaloric effect in this compound has been computed using the magnetization vs. field data obtained in the vicinity of the magnetic transition, and a maximum magnetic entropy change, -ΔSM, of ∼8.9J/kg/K is obtained at 5 K for a field change of 5T. Inverse magnetocaloric effect occurs at ∼2 K in 5 T indicating the presence of antiferromagnetic component. This has been further confirmed by the neutron diffraction study that evidences commensurate antiferromagnetic ordering at 2 K in zero magnetic field. A magnetic moment of ∼1.24μB/Ce 3+is obtained at 2 K and the magnetic moments are directed along Z-axis. © 2008 Elsevier B.V. All rights reserved.

Journal of Magnetism and Magnetic Materials

Understanding the magnetic ground state of rare-earth intermetallic compound Ce4Sb3: Magnetization and neutron diffraction studies

Magnetic ordering in Th3P4-type Tb4Sb3 compound

Hydrogen induced antiferromagnetism in the Kondo semimetal CeNiSn

Magnetic structure of the ternary germanide Ce3Ni2Ge7

Physica B: Condensed Matter

Recent advances in magnetic structure determination by neutron powder diffraction

Magnetic structure of the rare earth intermetallic compound Ce4Ge3

Journal	Journal of Alloys and Compounds
ISSN	09258388
Open Access	No