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The physical properties of itinerant antiferromagnetic (AFM) SrCr$_2$As$_2$with body-centered tetragonal ThCr$_2$Si$_2$ structure were investigated insingle crystalline and polycrystalline forms by electrical resistivity $\rho$,heat capacity $C_{\rm p}$, magnetic susceptibility $\chi$ versustemperature~$T$ and magnetization $M$ versus applied magnetic field $H$isotherm measurements as well as $^{75}$As and $^{53}$Cr nuclear magneticresonance (NMR) measurements in the wide temperature range $T$ = 1.6--900 K.From the $\chi(T)$ and $^{75}$As NMR measurements, the G-type AFM state below$T_{\rm N}$ = 615(15) K has been determined, consistent with the previousneutron-diffraction measurements. Direct evidence of magnetic ordering of theCr spins was shown by the observation of the $^{53}$Cr NMR spectrum under $H$ =0. From the $\chi(T)$ measurements on single-crystal SrCr$_2$As$_2$ under thetwo different magnetic field directions $H||ab$ and $H||c$ in the AFM state,the Cr ordered moments are shown to align along the $c$ axis in the G-type AFMstate. The metallic state is directly evidenced by the $\rho$, $C_{\rm p}$, andNMR measurements, and the density of states at the Fermi energy ${\calD}(E_{\rm F})$ in the AFM state is estimated to be 7.53 states/eV f.u. for bothspin directions which is almost twice the bare ${\cal D}(E_{\rm F})$ estimatedfrom first-principles calculations, suggesting an enhancement of theconduction-carrier mass by a factor of two in the AFM state. The ${\calD}(E_{\rm F})$ is found to be nearly constant below at least 100 K and isindependent of $H$. The $\rho(T)$ is found to show $T$-linear behavior above$T_{\rm N}$ and exhibits positive curvature below $T_{\rm N}$ where significantloss of spin-disorder scattering upon magnetic ordering is observed.

Itinerant G-type antiferromagnet SrCr2As2 studied by magnetization, heat capacity, electrical resistivity, and NMR measurements