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Magnetism in TmCo₂

100%

Šebesta J., Prchal J., Valenta J., Kratochvílová M., Sechovský V.

Acta Physica Polonica A

2015

vol. 127

issue 2

379-381

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.

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.

vol. 126

issue 1

288-289

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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2 Acta Physica Polonica A

1 2015

1 2014

2 Kratochvílová M.

2 Prchal J.

2 Sechovský V.

2 Valenta J.

2 Šebesta J.

1 Lapčák L.

1 Míšek M.

1 Prokleška J.

1 Turčinková D.

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Magnetism in TmCo₂

Magnetism in RCo_{2} (R = Dy, Ho, Er, Tm) Under Hydrostatic Pressure