Spin Gapless Semiconducting Nature in Co-rich Co1+xFe1-xCrGa: Insight and Advancements

Abstract

In this report, we present structural, electronic, magnetic and transport properties of Co-rich spin gapless semiconductor CoFeCrGa using both theoretical and experimental techniques. The key advantage of Co-rich samples $\mathrm{C}{\mathrm{o}}_{1+\mathrm{x}}\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{CrGa}$ is the high Curie temperature (T${}_{\mathrm{C}}$) and magnetization, without compromising the SGS nature (up to x = 0.4), and hence our choice. The quaternary Heusler alloys $\mathrm{C}{\mathrm{o}}_{1+\mathrm{x}}\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{CrGa}$ (x = 0.1 to 0.5) are found to crystallize in LiMgPdSn-type structure having space group $F\bar{4}3m$ (\# 216). The measured Curie temperature increases from 690 K (x = 0) to 870 K (x = 0.5). Observed magnetization values follow the Slater-Pauling rule. Measured electrical resistivity, in the temperature range of 5-350 K, suggests that the alloys retain the SGS behavior up to x = 0.4, beyond which it reflects metallic character. Unlike conventional semiconductors, the conductivity value (${\sigma }_{\mathrm{xx}}$) at 300 K lies in the range of 2289 S $\mathrm{c}{\mathrm{m}}^{-1}$ to 3294 S $\mathrm{c}{\mathrm{m}}^{-1}$, which is close to that of other reported SGS materials. The anomalous Hall effect is comparatively low. The intrinsic contribution to the anomalous Hall conductivity increase with x, which can be correlated with the enhancement in chemical order. The anomalous Hall coefficient is found to increase from 38 S/cm for x = 0.1 to 43 S/cm for 0.3. Seebeck coefficients turn out to be vanishingly small below 300 K, another signature for being SGS. All the alloys (for different x) are found to be both chemically and thermally stable. Simulated magnetization agrees fairly with the experiment. As such Co-rich CoFeCrGa is a promising candidate for room temperature spintronic applications, with enhanced T${}_{\mathrm{C}}$, magnetic properties and SGS nature.

arXiv comment11 pages, 15 figures

References in corpus (17)

• Phonons and related properties of extended systems from density-functional perturbation theory
• Anomalous Hall effect
• Slater-Pauling Behavior of the Half-Ferromagnetic Full-Heusler Alloys
• Wave-packet dynamics in slowly perturbed crystals: Gradient corrections and Berry-phase effects
• Proper Scaling of the Anomalous Hall Effect
• Realization of spin gapless semiconductors: the Heusler compound Mn2CoAl
• Spin gapless semiconducting behavior in equiatomic quaternary CoFeMnSi Heusler alloy
• A New Spin Gapless Semiconductors Family: Quaternary Heusler Compounds
• Search for spin gapless semiconductors: The case of inverse Heusler compounds
• Achieving High Curie Temperature in (Ga,Mn)As
• A new spin gapless semiconductor: quaternary Heusler CoFeCrGa alloy
• Half-Metallic Ferromagnetism in the Heusler Compound Co${}_2$FeSi revealed by Resistivity, Magnetoresistance, and Anomalous Hall Effect measurements
• Magnetic and transport properties of Mn2CoAl oriented thin films
• Competing magnetic and spin gap-less semiconducting behaviour in fully compensated ferrimagnet CrVTiAl: Theory and Experiment
• Structural, electronic, magnetic and transport properties of equiatomic quaternary Heusler Alloy CoRhMnGe: Theory and Experiment
• Anomalous Hall Effect in Chemically Disordered L10-Mn1.5Ga
• $\mathrm{C}{\mathrm{o}}_2\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{r}}_{\mathrm{x}}\mathrm{Si}$ Heusler Alloys : A promising material for spintronics application

Cited by in corpus (13)

• Half-metallic Ferromagnets, Spin Gapless Semiconductors, and Topological Semimetals Based on Heusler Alloys
• Experimental and Theoretical Investigation on the Possible Half-metallic Behaviour of Equiatomic Quaternary Heusler Alloys: CoRuMnGe and CoRuVZ (Z = Al, Ga)
• Half-metallic ferromagnetism and Ru-induced localization in quaternary Heusler alloy CoRuMnSi
• Unusual kinetic properties of usual Heusler alloys
• Experimental observation of spin glass state in highly disordered quaternary Heusler alloy FeRuMnGa
• Rare observation of spin-gapless semiconducting characteristics and related band topology of quaternary Heusler alloy CoFeMnSn
• Co-existence of Topological Non-trivial and Spin Gapless Semiconducting Behavior in MnPO${}_4$: A Composite Quantum Compound
• Disorder-mediated quenching of magnetization in NbVTiAl: Theory and Experiment
• Structural and magnetic behavior of Cr${}_2$Co${}_{(1-x)}$Cr${}_x$Al inverse Heusler alloys
• Al${}_2$MnCu: A magnetically ordered member of the Heusler alloy family despite having a valence electron count of 24
• Disproportionate influence of site disorder on the evolution of magnetic phases in anti-Heusler alloy Al${}_2$MnFe
• CoRuTiGe: A Possible Spin Gapless Semiconductor
• Disorder mediated fully compensated ferrimagnetic spin-gapless semiconducting behaviour in Cr3Al Heusler alloy