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1
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Uranium Intermetallics in High Magnetic Fields: Neutron Diffraction Experiments

100%
Prokeš K.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
209-214
EN
The neutron diffraction is an indispensable technique for the determination of magnetic structures. Due to a rather large penetration depth of neutrons in many materials one can construct complicated sample environments necessary to prepare the desired magnetic phase of the material under study. Combination of magnetic fields, low temperatures, and high hydrostatic or uniaxial pressures are possible. Capabilities of this technique are demonstrated on a few experimental results obtained on uranium UTX (T: transition metal, X: p-element) compounds.
2
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Magnetic Structure in UIrAl

51%
Prokeš K., Prchal J., Sechovský V., Andreev A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
339-342
EN
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.
3
Content available remote

The Low Temperature Study of Ln[Fe(CN)_6]·xH_2O Rare-Earth Ferricyanides, Ln=Pr,La

45%
Maťaš S., Mitróová Z., Kiefer K., Ryll H., Prokeš K.
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issue 5
962-964
EN
We present magnetic and structural properties of Ln[Fe(CN)_6]·xH_2O, Ln = Pr, La single crystals investigated by means of elastic neutron diffraction and heat capacity down to 0.03 K and susceptibility and magnetization measurements. The susceptibility data were taken on the commercial SQUID magnetometer (Quantum Design) in the range between 2 K and 30 K and in fields up to 5 T. Our low temperature neutron diffraction data taken in a zero field rules out some of antiferromagnetic models suggested in the literature.
4
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Magnetism in UCo_{0.88}Ru_{0.12}Ge Studied by Polarized Neutrons

39%
Vališka M., Pospíšil J., Nénert G., Stunault A., Prokeš K., Sechovský V.
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vol. 126
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issue 1
330-331
EN
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.
5
Content available remote

Low Temperature Neutron and Synchrotron Diffraction Studies of KEr(MoO_4)_2 Single Crystal in External Magnetic Field

39%
Maťaš S., Orendáčová A., Prokeš K., Feyerherm R., Dudzik E., Klemke B.
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issue 5
897-899
EN
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.
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