Significant change in the electronic behavior associated with structural distortions in the single crystalline SrAg4As2

Abstract

We report a combined study of transport and thermodynamic measurements on the layered pnictide material SrAg4As2. Upon cooling, a drop in electrical and Hall resistivity, a jump in heat capacity and an increase in susceptibility and magnetoresistance (MR) are observed around 110 K. These observations suggest that non-magnetic phase transitions emerge at around 110 K, that are likely associated with structural distortions. In sharp contrast with the first-principles calculations based on the crystal structure at room temperature, quantum oscillations reveal small Fermi pockets with light effective masses, suggesting a significant change in the Fermi surface topology caused by the low temperature structural distortion. No superconductivity emerges in SrAg${}_4$As${}_2$ down to 2 K and under pressures up to 2.13 GPa; instead, the low temperature structural distortion increases linearly with temperature at a rate of ~13 K/GPa above 0.89 GPa.

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Cited by in corpus (7)

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• Metamagnetic transitions and anomalous magnetoresistance in EuAg${}_4$As${}_2$ single crystal
• Pressure tuning of structural and magnetic transitions in EuAg${}_4$As${}_2$
• Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline EuAg${}_4$Sb${}_2$
• Fermiology and transport properties of the proposed topological crystalline insulator SrAg4Sb2
• Mapping the three-dimensional fermiology of the triangular lattice magnet EuAg${}_4$Sb${}_2$
• Quantum oscillations and transport properties of layered single-crystal SrCu${}_4$As${}_2$