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Jahn-Teller-like phase transition of TmPd3S4 around 200 K

Identifieur interne : 002451 ( Main/Exploration ); précédent : 002450; suivant : 002452

Jahn-Teller-like phase transition of TmPd3S4 around 200 K

Auteurs : J. Kitagawa [Japon] ; E. Matsuoka [Japon] ; N. Takeda [Japon] ; M. Ishikawa [Japon]

Source :

RBID : Pascal:99-0534368

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Abstract

We report a Jahn-Teller-like phase transition in a synthesized metallic compound, TmPd3S4, of the cubic NaPt3O4 structure type. The transition causes a very large thermal hysteresis in the electrical resistivity between 120 and 230 K and a modulated structure with a modulation vector of about 18a* (a*: reciprocal-lattice unit vector) at lower temperatures which was revealed by a low-temperature x-ray powder diffraction. Analyses on the low-temperature specific heat and the magnetic susceptibility suggest that the compound becomes an exchange-induced moment antiferromagnet (TN=1.1 K) by the nonmagnetic singlet ground state of Tm3+ ions.


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S
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<div type="abstract" xml:lang="en">We report a Jahn-Teller-like phase transition in a synthesized metallic compound, TmPd
<sub>3</sub>
S
<sub>4</sub>
, of the cubic NaPt
<sub>3</sub>
O
<sub>4</sub>
structure type. The transition causes a very large thermal hysteresis in the electrical resistivity between 120 and 230 K and a modulated structure with a modulation vector of about 18a
<sup>*</sup>
(a
<sup>*</sup>
: reciprocal-lattice unit vector) at lower temperatures which was revealed by a low-temperature x-ray powder diffraction. Analyses on the low-temperature specific heat and the magnetic susceptibility suggest that the compound becomes an exchange-induced moment antiferromagnet (T
<sub>N</sub>
=1.1 K) by the nonmagnetic singlet ground state of Tm
<sup>3+</sup>
ions.</div>
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