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Tunneling Spectroscopy Studies of SmB_6 and YbB_{12}

100%

Baťková M., Baťko I., Konovalova E., Shitsevalova N.

Acta Physica Polonica A

2008

vol. 113

issue 1

255-258

Reported electron tunneling studies of SmB_6 and YbB_{12} in the temperature region with a strongly temperature activated transport reveal a qualitative change of tunneling regime upon cooling. While the differential conductance curves above 50 K resemble the tunneling between two different metals, the spectra observed at 4.2 K are typical of the tunneling between a metal and a (narrow-gap) valence fluctuating semiconductor.

Low Temperature Transport and Magnetic Properties of SmB_{6}

76%

Gabani S., Flachbart K., Pavlík V., Konovalova E., Paderno Y., Herrmannsdörfer T.

Acta Physica Polonica A

2000

vol. 97

issue 3

419-422

We present results of transport and magnetic properties of three single-crystalline samples of the intermediate valence small-gap semiconductor SmB_{6} at low temperatures. The received resistivity dependences of the samples below 0.5 K exhibit an activated behavior with an energy gap of a few mK. The temperature dependences of the magnetic susceptibility show an increase below 15 K which can be accounted for by impurities, by bare Sm^{3+} ions or by a small amount of in-gap magnetic 4f^{5}5d^{1} states.

Influence of Pressure on the Electrical Transport Properties of Carbon-Doped EuB₆

64%

Pristáš G., Gabáni S., Baťko I., Baťková M., Orendáč M., Gažo E., Filipov V., Konovalova E., Diko P., Flachbart K.

Acta Physica Polonica A

2017

vol. 131

issue 4

982-984

We have studied the influence of hydrostatic pressure on the electrical resistivity of carbon-doped semimetal EuB₆ which orders ferromagnetically at T_{C}=3.9 K and is intrinsically inhomogeneous due to fluctuations of carbon content. We observed a shift of the low-temperature resistivity maximum from 4.6 K (at 1 bar) to 5.2 K (at 30.3 kbar) with increasing pressure. However, the maximum of the derivative dρ/dT(T), which reveals the temperature of ferromagnetic ordering, does not change its position with increasing pressure. This behaviour is different from stoichiometric EuB₆, where pressure increases the ferromagnetic ordering temperature. The origin of this discrepancy may lie in the increase of volume fraction of the non-ferromagnetic phase with increase of pressure. Additional magnetoresistance measurements at various pressures between 1.5 K and 30 K have shown that with increase of magnetic field the resistivity is monotonically decreasing, and above 1 T a transition to a monotonic resistivity behaviour (dρ/dT(T)>0) is observed. Our results support the picture that carbon-rich regions play a role of "spacers", which prevent the percolation of the ferromagnetic phase.

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3 Acta Physica Polonica A

1 2017

1 2008

1 2000

3 Konovalova E.

2 Baťko I.

2 Baťková M.

2 Flachbart K.

1 Diko P.

1 Filipov V.

1 Gabani S.

1 Gabáni S.

1 Gažo E.

1 Herrmannsdörfer T.

1 Orendáč M.

1 Paderno Y.

1 Pavlík V.

1 Pristáš G.

1 Shitsevalova N.

Search results

Tunneling Spectroscopy Studies of SmB_6 and YbB_{12}

Low Temperature Transport and Magnetic Properties of SmB_{6}

Influence of Pressure on the Electrical Transport Properties of Carbon-Doped EuB₆