Autor: Prokeš, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Magnetic Structure in UIrAl
Autorzy:: Prokeš, K.
Prchal, J.
Sechovský, V.
Andreev, A.
Powiązania:: https://bibliotekanauki.pl/articles/1813678.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.25.+z
Opis:: By means of neutron diffraction on a hexagonal UIrAl single crystal we find that this system orders ferromagnetically at low temperatures with magnetic moments of 0.93 (10) $μ_B$ aligned along the c axis. The Curie temperature $T_C$ = 65 (5) K determined from the diffraction experiment is in good agreement with bulk magnetic measurements.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 339-342
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Thermal Properties of Conducting Polypyrrole Nanotubes
Autorzy:: Rudajevová, A.
Varga, M.
Prokeš, J.
Kopecká, J.
Stejskal, J.
Powiązania:: https://bibliotekanauki.pl/articles/1402141.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.80.Le
66.70.Hk
65.40.De
66.30.Xj
Opis:: Thermal properties of polypyrrole nanotubes synthesized by the chemical oxidation of pyrrole with iron(III) chloride in the presence of methyl orange as structure-guiding template, have been investigated. As-prepared polypyrrole salt and corresponding base were compressed into pellets. Thermogravimetric analysis has shown that the heating/cooling of both polymers is connected with water desorption/re-absorption. This process influences all temperature dependences of the thermophysical properties. The specific heat of both polypyrrole forms was the same at 35°C. The thermal diffusivity of polypyrrole base was lower than that of the salt. The dilatational characteristics are strongly influenced by water desorption/re-absorption. Water desorption is connected with the contraction of polypyrrole and its re-absorption with the expansion of polypyrrole. The electrical resistivity was measured, in analogy to thermal experiments, by a four-point van der Pauw method. The electrical resistivity was 0.016 and 10.2 Ωcm at room temperature, for both materials. The electrical resistivity was also influenced by water desorption/re-absorption as well as other thermophysical properties.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 730-736
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Low Temperature Neutron and Synchrotron Diffraction Studies of $KEr(MoO_4)_2$ Single Crystal in External Magnetic Field
Autorzy:: Maťaš, S.
Orendáčová, A.
Prokeš, K.
Feyerherm, R.
Dudzik, E.
Klemke, B.
Powiązania:: https://bibliotekanauki.pl/articles/1534336.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.-y
28.20.Cz
25.40.Dn
Opis:: We report on low temperature magnetic properties of $KEr(MoO_4)_2$ single crystal, which was investigated from 0.28 K to 30 K in magnetic fields up to 6.5 T. Neutron elastic data collected above and below transition temperature $T_{N}$ ≈ 0.95 K suggest that an antiferromagnetic ordering establishes at low temperatures. The magnetic model within the $A_{x}C_{z}$ mode assuming only magnetic moment at erbium atom positions is suggested. Synchrotron experiment in moderate magnetic fields at temperatures above $T_{N}$ explains the origin of observed signal(s) at (0K0) reflection positions, K odd.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 897-899
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Magnetism in $UCo_{0.88}Ru_{0.12}Ge$ Studied by Polarized Neutrons
Autorzy:: Vališka, M.
Pospíšil, J.
Nénert, G.
Stunault, A.
Prokeš, K.
Sechovský, V.
Powiązania:: https://bibliotekanauki.pl/articles/1371426.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.70.Tx
61.05.fm
75.25.-j
Opis:: UCoGe is an archetype of coexisting weak itinerant 5f-electron ferromagnetism ($T_{C}$~3 K, $μ_{s}$=$0.03μ_{B}$/f.u.) and superconductivity ($T_{SC}$~ 0.6 K) at ambient pressure. The Ru substitution for Co leads to an initial sharp increase of the $T_{C}$ up to the maximum of $T_{C}$=8.5 K for x=0.12, increase of spontaneous magnetic moment and suppression of superconductivity. We have grown the $UCo_{0.88}Ru_{0.12}Ge$ single crystal and studied magnetization along the principal crystallographic axes. To see the microscopic background of these findings we performed a polarized neutron diffraction experiment on D3 diffractometer in ILL. We have found that the Co and U moments are parallel in $UCo_{0.88}Ru_{0.12}Ge$, in contrast to the antiparallel configuration in UCoGe. This is probably the reason of the spontaneous magnetization increase with Ru doping.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 330-331
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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