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

• Authors: G. Pristáš , S. Gabáni , I. Baťko , M. Baťková , M. Orendáč , E. Gažo , V. Filipov , E. Konovalova , P. Diko , K. Flachbart
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

74.62.Fj; 75.30.Kz

Discipline

• 74.62.Fj: Effects of pressure
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 982-984

Dates

published

2017-04

Contributors

author

G. Pristáš

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

S. Gabáni

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

I. Baťko

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

M. Baťková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

M. Orendáč

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
• Institute of Physics, Faculty of Sciences, P.J. Safarik University, Park Angelinum 9, 040 01 Košice, Slovakia

author

E. Gažo

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

V. Filipov

• Institute for Problems of Material Science, National Academy of Sciences of Ukraine, Krzhyzhanovsky 3, 03680 Kiev, Ukraine

author

E. Konovalova

• Institute for Problems of Material Science, National Academy of Sciences of Ukraine, Krzhyzhanovsky 3, 03680 Kiev, Ukraine

author

P. Diko

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

author

K. Flachbart

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.982