Autor: Pöttgen, R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Exotic phase transitions in RERhSn compounds
Autorzy:: Łątka, K.
Kmieć, R.
Kruk, R.
Pacyna, A.
Rams, M.
Schmidt, T.
Pöttgen, R.
Powiązania:: https://bibliotekanauki.pl/articles/148856.pdf
Data publikacji:: 2003
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: magnetic properties
phase transitions
Mössbauer spectroscopy
Opis:: Crystal and magnetic properties of three equiatomic ternary RERhSn compounds (where RE = Ce, Nd, Gd) have been studied by means of X-ray diffraction, ac, and dc magnetic susceptibility measurements, as well as using Mössbauer spectroscopy with 119Sn and 155Gd resonances. CeRhSn does not order magnetically down to 2 K while NdRhSn undergoes ferromagnetic transition at TC = 10.3 K and GdRhSn orders antiferromagnetically below TN = 16 K. Our CeRhSn and NdRhSn samples become superconductive below 6.5 K and 6.9 K, respectively.
Źródło:: Nukleonika; 2003, 48,suppl.1; 35-40
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Puzzling Magnetism of $Gd_3Cu_4Sn_4$
Autorzy:: Łątka, K.
Pacyna, A.
Pöttgen, R.
Schappacher, F.
Powiązania:: https://bibliotekanauki.pl/articles/1811579.pdf
Data publikacji:: 2008-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.80.+y
75.30.-m
Opis:: A polycrystalline, single phase sample of $Gd_3Cu_4Sn_4$ ($Gd_3Cu_4Ge_4$ type, Immm, a = 1473.5(1), b = 694.1(1), c = 447.2(1) pm) was synthesized by arc-melting of the elements and subsequent annealing of the sample at 1220 and 970 K, respectively. The magnetic properties of this compound were studied thoroughly by AC and DC magnetic susceptibility measurements and $\text{}^{155}Gd$ Mössbauer spectroscopy. These results reveal two antiferromagnetic phase transitions close to 13 and 8.6 K, respectively. The thermal variation of the magnetic hyperfine fields observed at two inequivalent Gd sites point to two magnetic substructures, which order independently.
Źródło:: Acta Physica Polonica A; 2008, 114, 6; 1501-1508
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Magnetic and Thermodynamic Properties of Ce₄RuAl
Autorzy:: Debnath, J.
Strydom, A.
Sondezi, B.
Tappe, F.
Pöttgen, R.
Powiązania:: https://bibliotekanauki.pl/articles/1384856.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Cr
75.30.Kz
75.30.Mb
Opis:: The results of magnetic susceptibility and heat capacity measurements are reported for the Ce₄RuAl compound above room temperature to low temperature range (400 K to 0.34 K) and in the magnetic field up to 7 T. The magnetic susceptibility χ(T) exhibits a distinct anomaly at 0.95 K which most probably suggests a paramagnetic to antiferromagnetic phase transition. The magnetic susceptibility obeys the Curie-Weiss law in the region 100-400 K and revealed an effective magnetic moment $μ_{eff}$=2.18 $μ_{B}$/Ce which is less than the value for free Ce³⁺ ($μ_{eff}$=2.54 $μ_{B}$). The paramagnetic Weiss temperature indicates net antiferromagnetic correlations. In the specific heat a peak at 1.3 K supports the bulk nature of the phase transition observed in χ(T). The Sommerfield coefficient is moderately enhanced in the paramagnetic phase, and suggests f-c correlations among the electrons prior to magnetic ordering. The obtained Sommerfield coefficient γ behavior is consistent with the Anderson model-based theoretical predictions.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 237-239
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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