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Solution Growth and Investigation of the Single Crystals from the CePdIn System

100%
Kratochvílová M., Custers J., Sechovský V.
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vol. 126
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issue 1
324-325
EN
We report on the investigation of recently discovered heavy fermion compounds within the Ce-Pd-In system. Single crystals of Ce_{n}Pd_{m}In_{3n+2m} (n=2, 3, 5; m=1, 2) and Ce_{4}Pd_{10}In_{21} were synthesized from In-flux. Specific heat measurements of the multiphase Ce_{n}Pd_{m}In_{3n+2m} system revealed a superconducting transition at T_{c}=0.69 K arising from Ce_{2}PdIn_{8} and another, magnetic transition at T_{m}=1.67 K arising from either Ce_{3}PdIn_{11} or Ce_{5}Pd_{2}In_{19}. Low-temperature data of Ce_{4}Pd_{10}In_{21} display ferromagnetic long-range order below 0.8 K.
2
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Anisotropic Magnetic Properties of URhIn₅ Compound

88%
Bartha A., Kratochvílová M., Sechovský V., Custers J., Dušek M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
339-341
EN
We report on synthesis and anisotropic physical properties of URhIn₅. High quality single crystals were grown from In self-flux. The compound undergoes a second-order phase transition into an antiferromagnetic state at T_{N} = 98 K. The transition is magnetic field independent up to 9 T. An increase of the resistivity ρ with j along the [100], [110] and [001] tetragonal axis indicates a spin-density-wave induced order with the gap opening first along the [001] direction. The magnetic susceptibility χ = M/H exhibits a strong anisotropy. Above T= 200 K, χ(T) follows the Curie-Weiss law with the effective moment of μ_{eff} = 3.71 μ_{B}/U and the Weiss temperatures of θ_{P}^{[100]} = -900 K and θ_{P}^{[001]} = -500 K for H ∥ [100] and H ∥ [001], respectively. The characteristic Kondo-like temperature for URhIn₅ yields T_{K}= 125 K.
3
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Magnetism in TmCo₂

88%
Šebesta J., Prchal J., Valenta J., Kratochvílová M., Sechovský V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
379-381
EN
Recently a new wave of interest in physics of RCo₂ compounds has been boosted by reports on unusual magnetic short range order configurations in the heavy rare-earth RCo₂ ferrimagnets in paramagnetic state. The newly observed phenomenon called parimagnetism consists in a short-range antiferromagnetic coupling between small ferromagnetic Co clusters and the nearest rare-earth moments. This paper is devoted to results of our experimental investigation of carefully prepared and characterized samples of TmCo₂, a compound on which controversial results can be found in literature. Detailed magnetization, AC susceptibility, specific heat and electrical resistivity measurements revealed two magnetic phase transitions at 4.6 and 3.6 K, respectively. The anomalies connected with the transitions are strongly dependent on magnetic field and hydrostatic pressure. The AC susceptibility anomaly connected with the onset of parimagnetism has been found at T_{f}=35 K. Contrary to other heavy rare-earth RCo₂ counterparts T_{f} of TmCo₂ is entirely pressure independent.
4
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Presence of Parimagnetism in Ho(Co_{1-x}Si_{x})_{2} Under Hydrostatic Pressure

88%
Valenta J., Prchal J., Kratochvílová M., Míšek M., Sechovský V.
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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.
5
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Magnetism in RCo_{2} (R = Dy, Ho, Er, Tm) Under Hydrostatic Pressure

64%
Prchal J., Šebesta J., Valenta J., Míšek M., Turčinková D., Lapčák L., Prokleška J., Kratochvílová M., Sechovský V.
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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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