Pressure-induced lattice collapse in tetragonal phase and structural phase transition in single crystalline Fe1.05Te

TL;DR

This study investigates how applying high pressure induces a lattice collapse and phase transitions in Fe1.05Te, revealing structural and electronic changes without superconductivity up to 14 GPa.

Contribution

It provides detailed insights into pressure-induced structural phase transitions and their effects on electronic properties in Fe1.05Te single crystals.

Findings

Lattice collapse occurs at 4 GPa in tetragonal phase.

Transition from tetragonal to monoclinic phase between 4 and 14 GPa.

No superconductivity observed under studied pressures.

Abstract

We report studies of in-situ x-ray diffraction (XRD) and electronic properties on the single crystalline of Fe1.05Te compound under high pressure. The results demonstrated that the sample undergoes a pressure-induced lattice collapse in tetragonal phase (cT) at 4 GPa at room temperature. The cT phase in turn transfers to monoclinic (M) phase with increasing pressure to 14 GPa. The resistance measurements under pressures show that the onset temperature of structural phase transition (TSTR) decreases upon transformation from the tetragonal (T) to the cT phase and turns up at the 4 GPa where is the boundary pressure of T-cT phase. The onset of antiferromagnetic transition (TAF) shows little change up to 0.8 GPa by magnetization measurements. In the domain of M phase, the sample behaves like semiconductor at low temperature. No superconductivity is observed under the pressure investigated.