Induced 3d and 4f magnetism in Gd1-xPrxNi2 Laves phase alloys

K. Bouziane, C. Carboni, C. Morrison

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The series of Gd1-xPrxNi2 (x = 0.25, 0.40, and 0.60) polycrystalline samples has been investigated using x-ray diffraction and magnetometry. The x-ray diffraction measurements showed that the lattice constant and the relative intensities of the C15 superstructure I 511/I440 and I511/I220 increase with the praseodymium content, reflecting an increasing number of ordered vacancies at the 4a sites. The temperature dependences of the zero-field cooled (M ZFC(T)) and field cooled (MFC(T)) magnetizations show that a moment is induced by the gadolinium on the Pr3+ ion and on the nickel subsystem. In the ordered phase both induced moments are antiparallel to that of the Gd3+ ion. A cusp is observed at a temperature T max in the MZFC(T) curve. Both critical temperatures Tc and Tmax are found to decrease with increasing praseodymium content, indicating a reduction in strength of the antiparallel coupling for Gd-Pr and Gd-Ni pairs.

Original languageEnglish
Article number025218
JournalJournal of Physics: Condensed Matter
Volume20
Issue number2
DOIs
Publication statusPublished - Jan 16 2008

Fingerprint

Laves phases
praseodymium
Praseodymium
Magnetism
x ray diffraction
moments
gadolinium
Diffraction
cusps
Ions
magnetic measurement
X rays
critical temperature
ions
Gadolinium
nickel
Nickel
Temperature
magnetization
temperature dependence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Induced 3d and 4f magnetism in Gd1-xPrxNi2 Laves phase alloys. / Bouziane, K.; Carboni, C.; Morrison, C.

In: Journal of Physics: Condensed Matter, Vol. 20, No. 2, 025218, 16.01.2008.

Research output: Contribution to journalArticle

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N2 - The series of Gd1-xPrxNi2 (x = 0.25, 0.40, and 0.60) polycrystalline samples has been investigated using x-ray diffraction and magnetometry. The x-ray diffraction measurements showed that the lattice constant and the relative intensities of the C15 superstructure I 511/I440 and I511/I220 increase with the praseodymium content, reflecting an increasing number of ordered vacancies at the 4a sites. The temperature dependences of the zero-field cooled (M ZFC(T)) and field cooled (MFC(T)) magnetizations show that a moment is induced by the gadolinium on the Pr3+ ion and on the nickel subsystem. In the ordered phase both induced moments are antiparallel to that of the Gd3+ ion. A cusp is observed at a temperature T max in the MZFC(T) curve. Both critical temperatures Tc and Tmax are found to decrease with increasing praseodymium content, indicating a reduction in strength of the antiparallel coupling for Gd-Pr and Gd-Ni pairs.

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