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Magnetic Phase Diagram of TmB_{4} under High Pressure

100%

Gabáni S., Pristáš G., Takáčová I., Flachbart K., Filipov V., Shitsevalova N., Siemensmeyer K.

vol. 126

issue 1

356-357

TmB_{4} is a Shastry-Sutherland frustrated system which exhibits very complex magnetic properties. In this contribution the phase diagram of magnetic field vs. temperature of TmB_{4} under hydrostatic pressure up to 26.5 kbar is investigated using sensitive ac-resistance measurements. Temperature and magnetic field dependences of resistance at various pressures were carried out in a piston cylinder pressure cell between 1.7 and 14 K and in magnetic fields up to 6 T. The obtained results exhibit shifts of ordering temperatures T_{N} as well as shifts of boundaries between different magnetic phases. The observed pressure dependences of T_{N} can be described by the relation d lnT_{N}/dp=+(0.16÷0.18) %/kbar. The effect of pressure on various interactions between magnetic ions in this compound is discussed.

Influence of Pressure on Superconductivity in YB_{6}

84%

Gabáni S., Pristáš G., Takáčová I., Flachbart K., Gažo E., Mori T., Braithwaite D., Samuely P.

vol. 126

issue 1

340-341

Magnetoresistivity measurements on a superconducting system of YB_{6} (T_c ≈7.5 K) down to 60 mK at hydrostatic pressures up to 47 kbar are presented. The superconducting transition temperature, as well as the third critical field H_{c3} reveal a linear decrease with increasing pressure with slopes of d ln H_{c3}/dp=-1.1 %/kbar, and d ln T_c/dp=-0.59 %/kbar. From the latter a critical pressure, p_c ≈ 170 kbar, at which T_c vanishes, is determined.

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2 Acta Physica Polonica A

2 2014

2 Flachbart K.

2 Gabáni S.

2 Pristáš G.

2 Takáčová I.

1 Braithwaite D.

1 Filipov V.

1 Gažo E.

1 Mori T.

1 Samuely P.

1 Shitsevalova N.

1 Siemensmeyer K.

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Magnetic Phase Diagram of TmB_{4} under High Pressure

Influence of Pressure on Superconductivity in YB_{6}