ACTA

Magnetic Phase Diagram of TmB₄ under High Pressure

S. Gabáni^a, G. Pristáš^a, I. Takáčová^a, K. Flachbart^a, V. Filipov^b, N. Shitsevalova^b, K. Siemensmeyer^c
^aCentre of Low Temp. Physics, Institute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia
^bInstitute for Problems of Materials Science, NASU, Krzhyzhanovsky 3, 03680 Kiev, Ukraine
^cHelmholtz Zentrum Berlin, Glienicker Str. 100, 14109 Berlin, Germany

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TmB₄ is a Shastry-Sutherland frustrated system which exhibits very complex magnetic properties. In this contribution the phase diagram of magnetic field vs. temperature of TmB₄ 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 ln T_N/d p=+(0.16÷0.18) %/kbar. The effect of pressure on various interactions between magnetic ions in this compound is discussed.

DOI: 10.12693/APhysPolA.126.356
PACS numbers: 75.30.Kz, 75.25.+z, 74.25.F, 62.50.-p