Anisotropic physical properties and pressure dependent magnetic ordering of CrAuTe$_4$

TL;DR

This study investigates the anisotropic magnetic, electronic, and structural properties of CrAuTe4 under ambient and high pressure, revealing pressure-induced phase transitions and changes in electronic states through magnetization, ARPES, and resistivity measurements.

Contribution

It provides new insights into pressure-dependent magnetic and electronic phase transitions in CrAuTe4, combining multiple experimental techniques to reveal anisotropic properties and electronic structure evolution.

Findings

Neel temperature decreases with pressure, reaching 236 K at 5.22 GPa.

Anomalies near 2 GPa suggest a possible phase transition.

Emergence of new quantum oscillation frequencies above 2 GPa indicates electronic state changes.

Abstract

Systematic measurements of temperature dependent magnetization, resistivity and angle-resolved photoemission spectroscopy (ARPES) at ambient pressure as well as resistivity under pressures up to 5.25 GPa were conducted on single crystals of CrAuTe$_4$. Magnetization data suggest that magnetic moments are aligned antiferromagnetically along the crystallographic $c$-axis below $T_\textrm{N}$ = 255 K. ARPES measurements show band reconstruction due to the magnetic ordering. Magnetoresistance data show clear anisotropy, and, at high fields, quantum oscillations. The Neel temperature decreases monotonically under pressure, decreasing to $T_\textrm{N}$ = 236 K at 5.22 GPa. The pressure dependencies of (i) $T_\textrm{N}$, (ii) the residual resistivity ratio, and (iii) the size and power-law behavior of the low temperature magnetoresistance all show anomalies near 2 GPa suggesting that there may be a phase transition (structural, magnetic, and/or electronic) induced by pressure. For pressures higher than 2 GPa a significantly different quantum oscillation frequency emerges, consistent with a pressure induced change in the electronic states.