Enhanced survival of short-range magnetic correlations and frustrated interactions in R3T intermetallics

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2012.01.021· OSTI ID:1037655

Baranov, Nikolai ^[1]; Proshkin, Aleksei ^[1]; Gubkin, Andrey ^[2]; Cervellino, A. ^[3]; Michor, H. ^[4]; Hilsher, G. ^[4]; Gerasimov, E. G. ^[1]; Ehlers, Georg ^[5]; Frontzek, Matthias D ^[5]; Podlesnyak, Andrey A ^[5]

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1. Institute of Metal Physics, Russia
2. Ural State University, Russia
3. Paul Scherrer Institut, Villigen, Switzerland
4. Institut fuer Festkoperphysik, Wien, Austria
5. ORNL

Elastic and inelastic neutron scattering and magnetization measurements have been used to study peculiarities of the magnetic state in R{sub 3}T compounds (R=Gd, Er, Tb; T=Ni, Co) below and above magnetic ordering temperatures. A pronounced non-Brillouin shape of the magnetization curves observed in the antiferromagnetic compounds Gd{sub 3}Ni and Tb{sub 3}Ni above their magnetic ordering temperatures together with earlier reported data about the retention of the magnetic contribution to the total specific heat of Gd{sub 3}T and anomalous behavior of the electrical resistivity above magnetic ordering temperatures are ascribed to the existence of short-range magnetic correlations in the wide temperature range in the paramagnetic state. The persistence of short-range magnetic order up to temperatures greater than 5-6 times the Neel temperature has been revealed by powder neutron diffraction measurements performed for Tb{sub 3}Ni and Tb{sub 3}Co. On the other hand, results from inelastic neutron scattering show that the low temperature magnetic excitations are strongly suppressed in both Tb{sub 3}Co and Er{sub 3}Co. It is suggested that the extended short-range magnetic correlations, which turn out to be an inherent feature of R{sub 3}T type compounds, are due to the layered crystal structure and to the difference between geometrically frustrated intra-layer exchange interactions and inter-layer exchange.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1037655
• Journal Information: Journal of Magnetism and Magnetic Materials, Vol. 324, Issue 11; ISSN 0304-8853
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXCHANGE INTERACTIONS
MAGNETIZATION
MAGNETIC PROPERTIES
NEEL TEMPERATURE
NEUTRON DIFFRACTION
NICKEL COMPOUNDS
RETENTION
RHODIUM COMPOUNDS
ELASTIC SCATTERING
INELASTIC SCATTERING
SHAPE
SPECIFIC HEAT