Synthesis and magnetic properties in quaternary Ca1- xPrxCo2As2single crystals

Wei Zhang; Bingbing Zong; Yating Cao; Peng Sun; Ziyi Zhang; Xianggang Qiu; Run Zhao; Huayi Liu; Yueju Fu; Kai Zhang; Yubao Li

doi:10.1088/1361-648X/abc201

Synthesis and magnetic properties in quaternary Ca_{1- x}Pr_xCo₂As₂single crystals

J Phys Condens Matter. 2020 Oct 29;33(4). doi: 10.1088/1361-648X/abc201.

Authors

Wei Zhang¹, Bingbing Zong¹, Yating Cao¹, Peng Sun¹, Ziyi Zhang¹, Xianggang Qiu², Run Zhao³, Huayi Liu¹, Yueju Fu¹, Kai Zhang¹, Yubao Li¹

Affiliations

¹ Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, People's Republic of China.
² Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
³ Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, People's Republic of China.

PMID: 33146150
DOI: 10.1088/1361-648X/abc201

Abstract

Series of Ca_1-xPr_xCo₂As₂(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 Ca_1-xPr_xCo₂As₂(0.1 ⩽x⩽ 1). Most importantly, the abrupt drop of low temperature magnetic susceptibility belowT_FiMwithx⩾ 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.

Keywords: 3d–4f coupling; AT2X2 structure; antiferromagnetic; ferromagnetic.