Metamagnetic transitions and anomalous magnetoresistance in EuAg${}_4$As${}_2$ single crystal

Abstract

In this paper, the magnetic and transport properties were systematically studied for EuAg${}_4$As${}_2$ single crystals, crystallizing in a centrosymmetric trigonal CaCu${}_4$P${}_2$ type structure. It was confirmed that two magnetic transitions occur at $\text{T}$${}_{N1}$ = 10 K and $\text{T}$${}_{N2}$ = 15 K, respectively. With the increasing field, the two transitions are noticeably driven to lower temperature. At low temperatures, applying a magnetic field in the $\text{ab}$ plane induces two successive metamagnetic transitions. For both $\text{H}$ $\parallel$ $\text{ab}$ and $\text{H}$ $\parallel$ $\text{c}$, EuAg${}_4$As${}_2$ shows a positive, unexpected large magnetoresistance (up to 202\%) at low fields below 10 K, and a large negative magnetoresistance (up to -78\%) at high fields/intermediate temperatures. Such anomalous field dependence of magnetoresistance may have potential application in the future magnetic sensors. Finally, the magnetic phase diagrams of EuAg${}_4$As${}_2$ were constructed for both $\text{H}$ $\parallel$ $\text{ab}$ and $\text{H}$ $\parallel$ $\text{c}$.

References in corpus (3)

• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Metamagnetic transition in EuFe${}_2$As${}_2$ single crystals
• Magnetic ordering and dense Kondo behaviour in EuFe${}_2$P${}_2$

Cited by in corpus (4)

• Multiple magnetic transitions, metamagnetism and large magnetoresistance in GdAuGe single crystals
• Large magnetoresistance and first-order phase transition in antiferromagnetic single-crystalline EuAg${}_4$Sb${}_2$
• 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${}_2$