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Presence of Parimagnetism in Ho(Co_{1-x}Si_{x})_{2} Under Hydrostatic Pressure

100%
Valenta J., Prchal J., Kratochvílová M., Míšek M., Sechovský V.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
406-408
EN
A new configuration of cobalt magnetic moments with respect to rare-earth ones on local level, named as parimagnetism, surviving above the Curie temperature was determined few years ago for ErCo_{2}. Occurrence of parimagnetism has recently been confirmed also for HoCo_{2}. In this paper we present results manifesting considerable composition and hydrostatic-pressure influence on characteristic temperatures of magnetism in Ho(Co_{1-x}Si_{x})_{2} compounds and draw a preliminary scenario analyzing the exchange interactions involved.
2
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Pressure Influence on Magnetic Properties of TbNiAl

100%
Javorský P., Prchal J., Klicpera M., Kaštil J., Míšek M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
280-281
EN
We have investigated the effect of hydrostatic pressure on magnetic properties of TbNiAl, crystallizing in hexagonal ZrNiAl-type structure. TbNiAl orders antiferromagnetically below T_{N}=45 K and undergoes further magnetic phase transition to another AF phase at T_{1}=23 K. The magnetic field of B_{c} ≅ 0.3 T applied along the c-axis at 2 K leads to the transition to ferromagnetic order. By applying the hydrostatic pressure, both T_{N} and T_{1} remain almost unaffected whereas B_{c} shows a strong increase. The hydrostatic pressure stabilizes the antiferromagnetic state which can be related to development of structural parameters.
3
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Transport Properties of CeCo_{12}B_6 in Vicinity of Phase Transition

86%
Skorokhod Y., Arnold Z., Míšek M., Kamarád J., Isnard O., Mayot H.
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EN
Study of resistivity and specific heat on CeCo_{12}B_6 compound was performed in a temperature range 2.5-300 K. The specific heat exhibits pronounced λ-type anomaly in the vicinity of the Curie temperature T_C. Using the Debye-Einstein model the following parameters were obtained: the Debye temperature θ_D = 185 K, coefficient of the electron specific heat γ_{el} = 115 mJ/mol K. The parabolic temperature dependence of resistivity ρ(T) = ρ_0 + A_ρT^2 was observed below T_C in agreement with ferromagnetic state. Comparison of dρ/dT(T) with C_M(T) allows to confirm their similar character, accordingly to theory of critical behavior.
4
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Magnetic and Transport Properties of CeCo_{12}B_6 and CeFe_2Co_{10}B_6 Compounds under Pressure

86%
Míšek M., Arnold Z., Skorokhod Y., Kamarád J., Isnard O., Mayot H.
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EN
Study of pressure effects on magnetic and transport properties of CeCo_{12}B_6 and CeFe_2Co_{10}B_6 was performed in temperature range 5-300 K at pressures up to 9 kbar. The significant decrease in the Curie temperature T_C as a consequence of Fe substitution from (135±1) K to (85±1) K is not accompanied by the changes of saturation magnetization. The decrease in T_C with pressure is the same for both samples -ΔT_C/Δp ≈ -0.5 K/kbar. The relative decrease in saturation magnetization with pressure is about 0.3%/kbar for both samples. Pressure induced resistivity changes were below 1%. The relatively low pressure effect on both the T_C and magnetization can be attributed to the hybridization as a consequence of small distances between the Co and B atoms.
5
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Magnetism in RCo_{2} (R = Dy, Ho, Er, Tm) Under Hydrostatic Pressure

73%
Prchal J., Šebesta J., Valenta J., Míšek M., Turčinková D., Lapčák L., Prokleška J., Kratochvílová M., Sechovský V.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
288-289
EN
The short-range parimagnetic configurations, observed in the heavy rare-earth RCo_{2} compounds in paramagnetic range far above the Curie temperature T_{C}, consist in formation of ferromagnetic cobalt clusters antiferromagnetically coupled to the neighboring R magnetic moments. The characteristic temperature of the onset of parimagnetism T_{f} is very sensitive to changes of external conditions like pressure or composition. The pressure coefficients ∂T_{f}/∂p and ∂T_{C}/∂p are comparable, indicating a close connection of underlying mechanisms. Our recent measurements indicate systematic evolution of the pressure coefficients with spanning the rare-earth series from Dy through Tm in RCo_{2} with a specific case TmCo_{2}.
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