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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/dp = +(0.16 divided by 0.18) %/kbar. The effect of pressure on various interactions between magnetic ions in this compound is discussed.

Magnetic Phase Diagram of TmB_{4} under High Pressure