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Paramagnetism of Cu_3RE_2W_4O_{18} Semiconductors (RE = Gd, Dy-Er)

100%

Groń T., Tomaszewicz E., Duda H., Mazur S.

Acta Physica Polonica A

2013

vol. 124

issue 5

885-887

Cu_3RE_2W_4O_{18} tungstates (RE = Gd, Dy-Er) are paramagnets in the temperature range 4.2-300 K visible also in the absence of the energy losses in the curve of the imaginary part of magnetic susceptibility, χ". The negative values of the paramagnetic Curie-Weiss temperature, θ, may suggest the weak antiferromagnetic coupling below 4.2 K. The temperature independent component of magnetic susceptibility has a positive value indicating a domination of the Van Vleck contribution. Calculations of the effective number of the Bohr magnetons revealed that the orbital contribution to the magnetic moment comes mainly from the RE^{3+} ions.

Semiconducting Properties of Cu_5SbO_6

76%

Groń T., Filipek E., Dąbrowska G., Duda H., Mazur S., Kukuła Z., Pawlus S.

Acta Physica Polonica A

2012

vol. 122

issue 6

1105-1107

Thermoelectric power, electrical resistivity, I-V characteristics, relative electrical permittivity, dc magnetization and ac magnetic susceptibility measurements carried out on Cu_5SbO_6 showed p-type semiconducting behaviour with the activation energy of 0.24 eV as well as ferrimagnetic order with the Néel temperature of 5.2 K. The effective magnetic moment of 5.857 μ_{B}/f.u. revealed the orbital contribution to the magnetic moment. Large value of the relative electrical permittivity indicated that the Cu^{2+} ions with the unscreened and unfilled electron shells are responsible for the polarizability and forming of electric dipoles.

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2 Acta Physica Polonica A

1 2013

1 2012

2 Duda H.

2 Groń T.

2 Mazur S.

1 Dąbrowska G.

1 Filipek E.

1 Kukuła Z.

1 Pawlus S.

1 Tomaszewicz E.

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Paramagnetism of Cu_3RE_2W_4O_{18} Semiconductors (RE = Gd, Dy-Er)

Semiconducting Properties of Cu_5SbO_6