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Synthesis and Characterization of the Superconductor Mo_3Sb_7

100%
Tran V., Bukowski Z.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
67-74
EN
We synthesized a polycrystalline sample of the superconductor Mo_3Sb_7 and characterized its basic properties by measurements of magnetization, electrical resistivity and specific heat. The measurements establish a superconducting phase transition at T_c=2.25 (0.05) K. In applied magnetic fields, the magnetization and resistivity show the behavior of type-II superconductor. From the specific heat measurement, the electronic specific heat coefficient,γ, specific heat jump at T_c, ΔC(T_c)/γT_c, and the Debye temperature Θ_D, are evaluated to be 34.5 mJ/(mol K^2), 1.56 and 283 K, respectively. From analysis of the specific heat data we suggest that this compound belongs to an intermediate strong coupling regime in the BCS context. The observed enhancement in theγ-value suggests a substantial contribution of Mo-4d-electrons to the density of states. Our experimental data do not support interpretation of superconductivity in Mo_3Sb_7 in terms of neither unconventional superconductivity or spin fluctuations proposed previously.
2
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Anisotropy of Magnetic and Transport Properties οf UAuSb_2 Single Crystals

81%
Troć R., Bukowski Z., Stępień-Damm J., Sułkowski C.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
181-184
EN
The uranium-gold diantimonide UAuSb_2 belongs to a numerous family of ternary compounds crystallizing in a tetragonal structure of the HfCuSi_2-type (space group P4/nmm). In this paper the results of magnetization, electrical resistivity and thermopower measured along the main crystallographic directions are reported. Two magnetic transitions, a ferromagnetic one at T_C =31 K and probably an antiferromagnetic one at T_N = 43 K were found. The spontaneous magnetization at 1.9 K amounts about 0.8 μ_B for B ⃦c-axis. Electrical resistivity for j⊥ c-axis exhibits a T^2 exp(-Δ/kT) dependence at low temperatures and a Kondo effect at higher temperatures above T_N. The thermopower S for both main crystallographic directions shows a maximum at the temperature close to T_C and the lack of any anomaly at T_N.
3
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Magnetic Phase Transition in CePd_{2}P_{2}

81%
Tran V., Bukowski Z., Tran L., Zaleski A.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
334-335
EN
The tetragonal CePd_{2}P_{2} compound has been investigated by ac magnetic susceptibility and dc magnetization measurements. The experimental data reveal a ferromagnetic phase transition at T_{C}=28.4± 0.2 K. Using Arrot-Noakes plot and scaling laws for a second-order phase transition, critical exponents for the ferromagnetic transition in the system were obtained. The critical exponents are located between those of the mean field and Heisenberg model values.
4
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Andreev Reflection Study of the Superconductor Mo_3Sb_7

61%
Dmitriev V., Rybaltchenko L., Khristenko E., Ishchenko L., Bukowski Z., Troć R.
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EN
The point-contact Andreev-reflection measurements on the new paramagnetic superconductor Mo_3Sb_7 were carried out. It was found that the order parameter ∆ is strongly anisotropic varying over a very wide range depending on the contact orientation when the maximum ∆_{max} exceeds at least 40 times the minimum ∆_{min} in spite of the invariable T_c that cannot be typical of conventional superconductors. For these and other reasons we suggest that Mo_3Sb_7 is not a trivial BCS (s-wave) superconductor but rather has some unconventional pairing symmetry.
5
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Interplay Between Spin Density Wave and Superconductivity in `122' Iron Pnictides: ^{57}Fe Mössbauer Study

61%
Błachowski A., Ruebenbauer K., Żukrowski J., Bukowski Z., Matusiak M., Karpinski J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
726-729
EN
Iron-based superconductors Ba_{0.7}Rb_{0.3}Fe_{2}As_{2} and CaFe_{1.92}Co_{0.08}As_{2} of the `122' family have been investigated by means of the 14.41-keV Mössbauer transition in ^{57}Fe versus temperature ranging from the room temperature till 4.2 K. A comparison is made with the previously investigated parent compounds BaFe_{2}As_{2} and CaFe_{2}As_{2}. It has been found that Mössbauer spectra of these superconductors are composed of the magnetically split component due to development of spin density wave and non-magnetic component surviving even at lowest temperatures. The latter component is responsible for superconductivity. Hence, the superconductivity occurs in the part of the sample despite the sample is single phase. This phenomenon is caused by the slight variation of the dopant concentration across the sample (crystal).
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