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Magnetic Properties of R^{(1)}_{1-x}R^{(2)}_{x}Al_{2} Alloys

100%
Matlak M., Ślebarski A.
Acta Physica Polonica A
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1991
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vol. 79
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issue 5
721-725
EN
Using the multiband s-f model we derive the formulae determining the Curie temperature and magnetic moment as functions of concentration x for R^{(1)}_{1-x}R^{(2)}_{x}Al_{2} intermetallic alloys, where R^{1,2} denote magnetic rare earth metals. These formulae, applied to R^{(1)}_{1-x}R^{(2)} alloys (R^{(1)} = La, Lu, Y, Zr and R^{(2)} = Gd) give the linear dependence of the Curie temperature and magnetic moment versus x in full agreement with experimental data.
2
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Kondo Insulating State in CeRhSb_{1-x}Sn_x as a Function of Carrier Number and Its Subsequent Metallization

100%
Ślebarski A., Spałek J.
Acta Physica Polonica A
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2007
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vol. 111
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issue 4
487-496
EN
A quantum critical point represents an essential singularity in the phase diagram of the electron-correlated compounds. In the CeRhSb_{1-x}Sn_x system we have observed a quantum criticality at the boundary Kondo insulator-non-Fermi liquid state. In this series of compounds, CeRhSb has a Kondo insulating ground state, whereas CeRhSn exhibits a non-Landau Fermi liquid behavior. In view of different types of behavior of CeRhSb and CeRhSn, we review the results of the solution in CeRhSb_{1-x}Sn_x and discuss the effect of a quasi-continuous change of the number of conduction electrons on the gap formation in the Kondo-insulating regime, as well as on the critical behavior appearance near the quantum critical point.
3
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Stabilization of Kondo Semiconductor State by Sb Doping of CeNi_{1-δ}Sn_{1+δ} and the General Criterion of Its Appearance

100%
Spałek J., Ślebarski A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
7-14
EN
Semimetallic off-stoichiometric CeNi_{1-δ}Sn_{1+δ-x}Sb_x system with δ≈0.06 is shown to transform into a Kondo semiconductor upon the substitution of few percent of Sb for Sn. The full-gap formation is associated with f-electron localization induced by the combined effect of the collective Kondo-singlet formation and the atomic disorder. Namely, the extra valence electrons introduced with the Sb doping (one per Sb atom) contribute additionally to the formation of the collective Kondo spin-singlet state at low temperatures, as seen by a substantial reduction of the magnetic susceptibility. The precise general definition of the Kondo semiconductor is provided and the difference with either the simple band or the Mott-Hubbard insulators is stressed.
4
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Structural Properties of REM_{2}Sn_{2} (RE=La, Ce and M=Ni, Cu)

81%
Ślebarski A., Kaczmarska K., Pierre J.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
267-270
EN
The lattice parameters a and c of CeM_{2}Sn_{2} show an anomalous temperature dependence compared to the analogous variations for LaM_{2}Sn_{2}. The anomaly Δa of thermal expansion for CeCu_{2}Sn_{2} has a maximum around 90 K, whereas Δc has a maximum near 140 K, near to the maximum of the magnetic resistivity Δρ.
5
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Band Gap Stability in Kondo Insulators

81%
Ślebarski A., Jezierski A., Zygmunt A.
Acta Physica Polonica A
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2000
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vol. 97
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issue 1
59-70
EN
We report on magnetic measurements and electronic structure investigations of CeNiSn and CeRhSb. Both belong to the group of Kondo insulators. The magnetic susceptibility shows the nonmagnetic ground state for these compounds and their alloys. The 3d X-ray photoemission spectroscopy spectra show evidence for the mixed valence state of Ce in CeRhSb alloys, as also seen for CeNiSn, whereas the spectra for the La substituted (Ce,La)NiSn compounds show only evidence for a pure Ce^{3+} ground state. We suggest the presence of Kondo-hole states in (Ce,La)RhSb. The location of the pseudogap in CeRhSb varies with the number of free electron, the valence of Ce, and the f-d hybridization. We discuss the similar crystallographic properties and the closed electronic structures of ZrNiSn-type semi-Heusler alloys and CeNiSn-type Kondo insulators.
6
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Thermoelectric Properties of Heavy Fermion Compound Ce₃Co₄Sn₁₃

71%
Witas P., Kalinowski L., Goraus J., Fijałkowski M., Ślebarski A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
309-311
EN
The heavy fermion compound Ce₃Co₄Sn₁₃ was studied in terms of its thermoelectric properties. To enhance its figure of merit we milled the solid sample and then pressed to obtain a consistent granulated material. The main properties, such as the Seebeck coefficient, thermal conductivity and electronic resistivity were measured at low (< 300 K) temperatures for both, the solid and the granulated sample. Thermal conductivity was diminished and the Seebeck coefficient was slightly enhanced, while the resistivity of produced material was increased. We explain it by strong electron scattering on defects and grain boundaries present in the sample. The resulting figure of merit ZT was found to be enhanced almost across the whole measured T region.
7
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Specific Heat and Magnetic Properties of Single-Crystalline (Zn_{0.925}In_{0.054})[Cr_{1.84}In_{0.152}]Se_4 Semiconductor

61%
Malicka E., Groń T., Pacyna A., Ślebarski A., Goraus J., Gągor A., Mydlarz T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
1108-1110
EN
An antiferromagnetic order with a Néel temperature T_{N} = 17.5 K, a strong ferromagnetic exchange evidenced by a positive Curie-Weiss temperature θ_{CW} = 77.3 K, the fuzzy peaks in the real component of susceptibility χ'(T) and the disappearance of the second critical field were established. The curvature of specific heat C(T) and C(T)/T in surrounding of T_{N} indicated a broad peak, characteristic for the system with inhomogeneous magnetic state (spin-glass-like phase). The calculated magnetic entropy showed the value of S(T) ≈ 1 J/(mol K) which is extremely small; i.e., much lower than the magnetic contribution Rln(2S + 1) = 11.52 J/(mol K) calculated for the spin 3/2.
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