Unusual criticality of Cu2Te2O5Br2 under pressure

TL;DR

This study investigates how applying pressure affects the magnetic properties of Cu2Te2O5Br2, revealing an unusual behavior where magnetic coupling increases while the phase transition temperature decreases rapidly.

Contribution

It provides the first detailed measurement of pressure effects on magnetic susceptibility and phase transition in Cu2Te2O5Br2, highlighting its unusual critical behavior.

Findings

Magnetic coupling strength increases by 25% under 8 kbar pressure.

The antiferromagnetic phase transition temperature T0 decreases and disappears at 8.2 kbar.

Pressure significantly alters the magnetic criticality of Cu2Te2O5Br2.

Abstract

We present measurements of the magnetic susceptibility chi(T) on Cu2Te2O5Br2 under externally applied pressure. From our data we extract the pressure response of the antiferromagnetic phase transition at T0 = 11.6 K and of the overall magnetic coupling strength. Our experiments indicate that with pressure the overall magnetic coupling strength increases by about 25% with applied pressure of only 8 kbar. In contrast, the phase transition temperature T0 is significantly suppressed and not observable anymore at a pressure of already 8.2 kbar.