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Reappearance of Antiferromagnetic Order in Nd_{0.9}Ca_{0.1}BaCo_{2}O_{5+δ} for δ > 0.51

100%
Piętosa J., Kolesnik S., Puźniak R., Dabrowski B.
Acta Physica Polonica A
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2014
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vol. 126
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issue 4a
A-50-A-53
EN
The absence of the antiferromagnetic order in Nd_{0.9}Ca_{0.1}BaCo_2O_{5.5} has been found to remain unchanged by applying a hydrostatic pressure of 10 kbar. In magnetic studies of polycrystalline Nd_{0.9}Ca_{0.1}BaCo_2O_{5+δ} (δ=0.07-0.69), we have found a reappearance of the antiferromagnetic phase, caused by an increase in oxygen index δ above 0.51 related to extra oxygen ions addition into the NdO_{δ} plane. For the samples with δ=0.555 and 0.59, a coexistence of well developed antiferromagnetic phase with ferrimagnetic one is evidenced.
2
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Influence of Hydrostatic Pressure on Magnetic Properties of (Sr,La)(Ru,Cr,Mn)O_3

76%
Piętosa J., Wiśniewski A., Puźniak R., Kolesnik S., Majjiga M., Dabrowski B.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
159-163
EN
An influence of hydrostatic pressure, P, on phase transition temperature, T_C, and spontaneous magnetisation, M_0, of selected perovskite ruthenates (SrRuO_3, La_{0.2}Sr_{0.8}RuO_3, SrRu_{0.9}Mn_{0.1}O_3, and SrRu_{0.9}Cr_{0.1}O_3) was determined to 12 kbar. A decrease in T_C with pressure was found for all of the studied samples. The M_0(P) remains unchanged for most of the samples, except for the La_{0.2}Sr_{0.8}RuO_3 sample. The weakening of ferromagnetic interactions with increasing pressure is consistent with complex band structure effects related to the modulation of the Ru-O hybridisation by the change of structural distortion.
3
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Conductivity and Superconductivity of (Bi,Pb)_4Sr_3Ca_3Cu_4O_x Glass-Ceramics

76%
Gazda M., Kusz B., Stizza S., Chudinov S., Natali R., Piętosa J., Bienias A.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
617-625
EN
In the (Bi,Pb)-Sr-Ca-Cu-O system, materials of various electrical and superconducting properties may be produced by a glass-ceramic method. Phase composition, structure, microstructure and also electrical properties of the material change as a result of heat treatment. Depending on the heat treatment conditions, either a superconductor with the critical temperature between 8 and 105 K or material without a superconducting transition may be obtained. The properties of the material change so much because during annealing three oxide superconductors belonging to the bismuth family are formed. (Bi_{0.8}Pb_{0.2})_4Sr_3Ca_3Cu_4O_x glass was prepared by a standard technique of quenching homogenized and melted substrates. The glass-ceramic samples were obtained by annealing of the glass beneath melting temperature. Structure and microstructure of glass-ceramic samples were studied with scanning electron microscopy and X-ray diffraction method. Superconducting properties were studied by means of electrical conductivity and magnetization measurements. In this paper we present the influence of the phase composition, structure and microstructure on the electrical conductivity in the normal state and the superconducting properties of (Bi,Pb)_4Sr_3Ca_3Cu_4O_x glass-ceramics.
4
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Influence of Pressure on Magnetic Properties of La_{1-x} Sr_xCoO_{3-δ}(x=0.5, 0.67, 1)

76%
Piętosa J., Wiśniewski A., Puźniak R., Kolesnik S., Majjiga M., Dabrowski B.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
527-532
EN
Influence of pressure on the phase transition temperature T_C and on the spontaneous magnetisation M_{0} of highly Sr substituted and oxygen nonstoichiometric La_{1-x}Sr_xCoO_{3-δ} samples was investigated. An increase in T_C and M_0 with pressure in investigated samples was found, indicating strengthening of ferromagnetic double exchange interactions, and the expansion of volume of ferromagnetic phase as a~result of enhancement in ferromagnetic interactions in both cluster-glass and long range ferromagnetic states. We did not observe clear correlation between changes in pressure coefficient dT_C/dP and changes in the formal oxidation state of the Co ion.
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