Issue |
Europhys. Lett.
Volume 51, Number 4, August II 2000
|
|
---|---|---|
Page(s) | 427 - 433 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2000-00512-5 | |
Published online | 01 September 2002 |
Persistence of a non-antiphase modulated magnetic
structure to
in the heavy electron compound
1
Commissariat à l'Energie Atomique, DRECAM/SPEC
91191 Gif-sur-Yvette, France
2
Université de Nancy I - 54506 Vandoeuvre-lès-Nancy, France
3
Commissariat à l'Energie Atomique, DRFMC/SPSMS 38054
Grenoble Cedex 9, France
4
II. Physikalisches Institut, Universität zu Köln
Zülpicher Str. 77, 50937 Köln, Germany
5
Max Planck Institut for Chemical Physics of Solids 1187 Dresden,
Germany
Received:
28
March
2000
Accepted:
5
June
2000
Measurements by 170Yb Mössbauer spectroscopy down to 0.025 K and by
neutron diffraction down to 1.7 K have been performed in the
heavy electron compound YbPtAl ().
At 0.025 K, the Mössbauer spectrum evidences
a non-square modulation of the magnetic moment, incommensurate with the
lattice spacings. This is the first clear
example of a Kramers local moment Yb-based system where the Kondo singlet
ground state allows a modulated magnetic structure to persist to
K.
The 3rd- and 5th-order harmonics of the
modulation could be measured, and their
thermal variation was followed from 0.025 K to 5 K. An abrupt decrease of
both harmonics at 3 K is concomitant with
a peak in the specific heat, suggesting a first-order phase transition
where the modulation transforms into a pure sine wave.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.30.Fv – Spin-density waves / 76.80.+y – Mössbauer spectroscopy; other γ-ray spectroscopy
© EDP Sciences, 2000
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