Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca{1-x}Sr{x}Co{2-y}As{2}

Abstract

The inference of Ying et al. [EPL 104, 67005 (2013)] of a composition-induced change from c-axis ordered-moment alignment in a collinear A-type antiferromagnetic (AFM) structure (AFMI) at small x to ab-plane alignment in an unknown AFM structure (AFMII) at larger x in Ca(1-x)Sr(x)Co(2-y)As(2) with the body-centered tetragonal ThCr2Si2 structure is confirmed. Our major finding is an anomalous magnetic behavior in the crossover region 0.2 < x < 0.3 between these two phases. In this region the magnetic susceptibility versus temperature chi_ab(T) measured with magnetic fields H applied in the ab plane exhibit typical AFM behaviors with cusps at the Neel temperatures of about 65 K, whereas chi_c(T) and the low-temperature isothermal magnetization M_c(H) with H aligned along the c axis exhibit extremely soft ferromagnetic-like behaviors.

6 pages and 5 figures, plus 26 pages and 26 figures of Supplemental Information

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Cited by in corpus (7)

• Ferromagnetic cluster-glass phase in Ca(Co,Ir)2As2 crystals
• Magnetic phase transitions in Eu(Co,Ni)2As2 single crystals
• Antiferromagnetic Stacking of Ferromagnetic Layers and Doping Controlled Phase Competition in Ca${}_{1-x}$Sr${}_x$Co${}_{2-y}$As${}_2$
• Competing magnetic fluctuations and orders in a multiorbital model of doped SrCo${}_2$As${}_2$
• Magnetic order and fluctuations in quasi-two-dimensional planar magnet Sr(Co${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Suppression of antiferromagnetic order and strong ferromagnetic spin fluctuations in Ni-doped CaCo2As2 single crystals
• Emergence of ferromagnetism due to Ir substitutions in single-crystalline Ba[Co(1 x)Ir(x)]2As2