Magnetic structures and crystal field in the heavy electron
materials YbAgGe and YbPtIn |
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Authors: | P Bonville M Rams K Królas J-P Sanchez P C Canfield O Trovarelli C Geibel |
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Institution: | (1) Commissariat à l'énergie Atomique, Centre de Saclay, DSM/SPEC, 91191 Gif-sur-Yvette Cedex, France;(2) Institute of Physics, Jagiellonian University, 30-059 Kraków, Poland;(3) Commissariat à l'énergie Atomique, Centre de Grenoble, DSM/SPSMS, 38054 Grenoble, France;(4) Ames Laboratory, Iowa State University, Ames, IA 50011, USA;(5) Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany |
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Abstract: | We have examined the magnetic properties of the heavy electron compounds
YbAgGe and YbPtIn by 170Yb M?ssbauer spectroscopy down to 0.1 K, and
the crystal field properties of YbAgGe by Perturbed Angular Correlations
(PAC) measurements up to 900 K. In YbAgGe, we show that each of the two
magnetically ordered phases below 0.8 K involves a specific incommensurate
modulation of the Yb moment. An analysis of existing low temperature specific
heat data suggests the
persistence of fluctuations of the correlated Yb spins down to 0.1 K.
The PAC data allow to discriminate among proposed Yb3+ crystal field
level schemes. In YbPtIn, we show that the low temperature magnetic order
phase has an antiferro-para structure, where zero moment Yb ions coexist with
large moment ones, and that a 90° moment reorientation occurs at
1.4 K. |
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Keywords: | 71 27 +a Strongly correlated electron systems heavy fermions 76 80 +y Mossbauer effect other gamma-ray spectroscopy |
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