Pressure-induced magnetic transitions in the frustrated Laves compound GdMn{sub 2}

Journal Article · Fri Jul 01 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.014420· OSTI ID:20719110

Goncharenko, I N ^[1]; Mirebeau, I; Cadavez-Peres, P ^[1]; Markosyan, A S ^[2]; Le Bihan, T ^[3]

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1. Laboratoire Leon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France)
2. Faculty of Physics, M.V. Lomonosov Moscow State University, 119992 Moscow (Russian Federation)
3. European Synchrotron Research Facility, Boite Pestaie 220, 38043 Grenoble Cedex (France)

We studied the magnetic and crystal structure of the magnetically unstable compound GdMn{sub 2} using neutron diffraction and x-ray diffraction at ambient pressure and applied pressure up to 4.4 GPa (neutron) and 16 GPa (x ray). At ambient pressure, GdMn{sub 2} shows a short-range antiferromagnetic order with a ferromagnetic component appearing at low temperature. As pressure increases, the Mn moments transform from an intrinsic to an induced state around 1.5 GPa and then vanish completely. This transformation yields a suppression of the short-range antiferromagnetic correlations imposed by the topologically frustrated Mn sublattice. We show that in the pressure range 2<P<4 GPa spin fluctuations on the Mn sites prevent a complete magnetic order in the Gd sublattice. Finally, above 4 GPa, the system recovers a purely ferromagnetic disorder-free magnetic state. We show that GdMn{sub 2} exhibit a very intriguing and, in some sense, unique interplay between the f and d magnetisms.

• OSTI ID: 20719110
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 1 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CORRELATIONS
CRYSTAL STRUCTURE
FERROMAGNETIC MATERIALS
FLUCTUATIONS
GADOLINIUM ALLOYS
MANGANESE ALLOYS
NEUTRON DIFFRACTION
NEUTRONS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SPIN
TEMPERATURE DEPENDENCE
X RADIATION
X-RAY DIFFRACTION