Structural, electronic, magnetic and transport properties of equiatomic quaternary Heusler Alloy CoRhMnGe: Theory and Experiment

Abstract

In this work, we present structural, electronic, magnetic, mechanical and transport properties of equiatomic quaternary Heusler alloy, CoRhMnGe using both theoretical and experimental techniques. A detailed structural analysis is performed using X-ray diffraction(XRD) and extended X-ray absorption fine structure(EXAFS) spectroscopy. The alloy is found to crystallize in Y-type structure having space group $F\bar{4}3m$ (\# 216). The ab-initio simulation pedict half-metallic ferromagnetic characteristics leading to large spin polarization. The calculated magnetization is found to be in fair agreement with experiment as well as those predicted by the Slater-Pauling rule, which is a prerequisite for half-metallicity. The magnetic transition temperature(${\mathrm{T}}_{\mathrm{C}}$) is found to be $\sim 760$ K. Measured electrical resistivity in the temperature range 2-400 K also gives an indication of half-metallic behavior. Simulated resistivity matches fairly well with those measured, with the temperature dependant carrier relaxation time lying in the range $1-2$ fs. Effect of hydrostatic pressure on electronic structure, magnetic and mechanical properties are investigated in detail. The alloy is found to preserve half-metallic characteristics upto 30.27 GPa beyond which it transit to metallic phase. No magnetic phase transition is found to occur in the whole range of pressure. The system also satisfies the Born-Huang criteria for mechanical stability upto a limited range of pressure. All these properties make CoRhMnGe alloy promising for spintronics devices.

References in corpus (5)

• Slater-Pauling Behavior of the Half-Ferromagnetic Full-Heusler Alloys
• Spin gapless semiconducting behavior in equiatomic quaternary CoFeMnSi Heusler alloy
• Half-Metallic Ferromagnetism in the Heusler Compound Co${}_2$FeSi revealed by Resistivity, Magnetoresistance, and Anomalous Hall Effect measurements
• High spin polarization in CoFeMnGe quaternary Heusler alloy
• Electronic structure, magnetism and antisite disorder in CoFeCrGe and CoMnCrAl quaternary Heusler alloys

Cited by in corpus (14)

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• CoFeVSb: A Promising Candidate for Spin Valve and Thermoelectric Applications
• $\mathrm{C}{\mathrm{o}}_2\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{r}}_{\mathrm{x}}\mathrm{Si}$ Heusler Alloys : A promising material for spintronics application
• Coexisting structural disorder and robust spin-polarization in half-metallic FeMnVAl
• Half-metallic ferromagnetism and Ru-induced localization in quaternary Heusler alloy CoRuMnSi
• FeRhCrSi: A new spin semimetal with room temperature spin-valve behavior
• Rare observation of spin-gapless semiconducting characteristics and related band topology of quaternary Heusler alloy CoFeMnSn
• High spin-polarization in a disordered novel quaternary Heusler alloy FeMnVGa
• Band splitting induced Berry flux and intrinsic anomalous Hall conductivity in NiCoMnGa quaternary Heusler compound
• High T${}_C$ ferromagnetic inverse Heusler alloys: A comparative study of Fe${}_2$RhSi and Fe${}_2$RhGe
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• Disorder-mediated quenching of magnetization in NbVTiAl: Theory and Experiment
• Lattice Dynamics, Mechanical Properties, Electronic Structure and Magnetic Properties of Equiatomic Quaternary Heusler Alloys CrTiCoZ (Z =Al,Si) using first principles calculations