Abstract:We present the temperature dependent magnetization, M(T), and the resistivity, ρ(T), of EuCu2Ge2 and EuCu2Si2 in single crystalline form. The EuCu2Ge2, which is synthesized in single-crystalline form, shows two different magnetic transitions in M(T) at TMc=8.5 K and TMab=4 K depending upon the magnetic field orientation. On the other hand, the ρ(T) reveals only one transition at T=4 K as a sudden drop of the ρ(T) without any noticeable change at T=8.5 K. For the EuCu2Si2, M(T) shows a two step antiferromagneti… Show more
“…Single crystals of EuCu 2 Si 2 were synthesized from an In flux, as described in [7]. They were found to be single phase, crystallizing in the tetragonal ThCr 2 Si 2 structure with lattice constants a=4.10 Å and c=9.93 Å [7].…”
Section: Methodsmentioning
confidence: 99%
“…They were found to be single phase, crystallizing in the tetragonal ThCr 2 Si 2 structure with lattice constants a=4.10 Å and c=9.93 Å [7]. 151 Eu Mössbauer measurements were performed in the temperature range 2.2-299.5 K with a standard Mössbauer spectrometer operating in a sine mode using a 330 mCi 151 Sm (SmF 3 ) source kept at room temperature.…”
The 151 Eu Mössbauer effect study in the temperature range 2.2-299.5 K on pulverized single crystals of EuCu 2 Si 2 synthesized from an indium flux is presented. In contrast to previous studies on polycrystalline samples in which valence fluctuations for Eu were reported, we find that the Eu atoms are divalent in the whole temperature range. Therefore, there are no charge fluctuations of Eu in EuCu 2 Si 2 .
“…Single crystals of EuCu 2 Si 2 were synthesized from an In flux, as described in [7]. They were found to be single phase, crystallizing in the tetragonal ThCr 2 Si 2 structure with lattice constants a=4.10 Å and c=9.93 Å [7].…”
Section: Methodsmentioning
confidence: 99%
“…They were found to be single phase, crystallizing in the tetragonal ThCr 2 Si 2 structure with lattice constants a=4.10 Å and c=9.93 Å [7]. 151 Eu Mössbauer measurements were performed in the temperature range 2.2-299.5 K with a standard Mössbauer spectrometer operating in a sine mode using a 330 mCi 151 Sm (SmF 3 ) source kept at room temperature.…”
The 151 Eu Mössbauer effect study in the temperature range 2.2-299.5 K on pulverized single crystals of EuCu 2 Si 2 synthesized from an indium flux is presented. In contrast to previous studies on polycrystalline samples in which valence fluctuations for Eu were reported, we find that the Eu atoms are divalent in the whole temperature range. Therefore, there are no charge fluctuations of Eu in EuCu 2 Si 2 .
“…Whereas the crystals grown from the indium flux fail to show these features and instead exhibit plain antiferromagnetism [7]. [7,8], where the axis orientation was not indicated. In contrast to the magnetic susceptibility, the anisotropy in the electrical resistivity for the two different crystallographic orientations is less significant.…”
Section: Magnetic and Electronic Transport Propertiesmentioning
confidence: 87%
“…Here the molten zone acts as a self-flux, which considerably differs from the In flux used by previous authors [7,8]. The magnetic and electronic transport properties of the grown crystals have been described in a previous article [10].…”
Section: Introductionmentioning
confidence: 96%
“…In Ref. [8] for crystals prepared with the same method two magnetic transitions at 10 and 4 K and exotic electrical properties below T¼2 K were reported. This behavior and the magnetic properties of the single crystals turned out to be at strong variance with those of polycrystalline samples, which do not show evidence of magnetic order [3].…”
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