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Electron Transport and Point Contact Spectroscopy of Cubic DyCu_{5}

100%

Nenkov K., Idzikowski B., Ilkovic S., Kačmarčiková E., Reiffers M., Müller K.

Acta Physica Polonica A

2000

vol. 97

issue 5

843-846

The electron transport properties and point contact spectra of melt-spun DyCu_{5} with the cubic phase (structure type AuBe_{5}, space group $F\overline{4}3m$) were investigated. It was found by ac-susceptibility measurements that below a transition temperature T_{m}=6.5 K this phase shows metamagnetism. Between T_{m} and T_{C}=14.5 K a spontaneous magnetization is found. Our measurements of electrical resistivity confirm the existence of two magnetic phase transitions in the compound. Furthermore, we present point contact spectra of DyCu_{5}-Cu heterocontacts which are directly proportional to the electron-quasiparticle interaction function. Apart from a peak at about 18 meV, which is characteristic of electron-phonon interaction in pure Cu, we observed a series of additional maxima at lower energy, which are connected with the allowed 4f-transitions from the ground state to excited crystalline electric field levels.

The Anisotropy of the Electrical Resistivity and Thermal Expansion of Single Crystal DyNi_{5}

84%

Kačmarčiková E., Reiffers M., Mihálik M., Kováč J., Menovsky A., Garcia Soldevilla J., Señas Pariente A., Goméz Sal J.

Acta Physica Polonica A

2000

vol. 97

issue 5

811-814

The results of the measurements of temperature dependence of the electrical resistivity ρ(T), thermal expansion L(T) and susceptibility χ(T) on single crystal DyNi_{5} in the temperature range 4.2-300 K are reported. The maximum in ρ(T) at T_{N}=12.2 K was observed which corresponds to the transition to antiferromagnetically ordered state. Taking into account the Bloch-Grüneisen formula for electron-phonon contribution ρ_{ph}(T) to ρ(T) the anisotropic magnetic contribution ρ_{mag}(T) was determined. We also observed the anisotropic behaviour of L(T) at low temperatures.

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2 Acta Physica Polonica A

2 2000

2 Kačmarčiková E.

2 Reiffers M.

1 Garcia Soldevilla J.

1 Goméz Sal J.

1 Idzikowski B.

1 Ilkovic S.

1 Kováč J.

1 Menovsky A.

1 Mihálik M.

1 Müller K.

1 Nenkov K.

1 Señas Pariente A.

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Electron Transport and Point Contact Spectroscopy of Cubic DyCu_{5}

The Anisotropy of the Electrical Resistivity and Thermal Expansion of Single Crystal DyNi_{5}