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Synthesis and magnetic properties in quaternary Ca1-xPrxCo2As2single crystals
Wei Zhang1, Bingbing Zong1, Yating Cao1
1Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, People's Republic of China.
Abstract:
Series of Ca1-xPrxCo2As2(x= 0, 0.10, 0.25, 0.4, 0.6, 0.75, 0.85, 1) single crystals have been synthesized in order to clarify the variation of magnetic order from antiferromagnetic (AFM) in CaCo2As2to ferromagnetic (FM) in PrCo2As2. It is found that the lattice constant ofc-axis are contracted with the introduction of Pr into Ca sites in CaCo2As2. Electronic transport measurements reveal the metallicity in this system. Systematic magnetic measurements and analysis show that substituting only 10% of Pr for Ca changes the magnetic ground state from A-type AFM ordering of Co magnetic moment in CaCo2As2to FM ordering in Ca1-xPrxCo2As2(0.1 ⩽x⩽ 1). Most importantly, the abrupt drop of low temperature magnetic susceptibility belowTFiMwithx⩾ 0.25 and the observed magnetic pole reversal withx⩾ 0.4 suggests an AFM coupling between Co 3dand Pr 4fmagnetic sublattice. Finally, a detailed magnetic phase diagram in this system has been obtained.
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