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Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co2+ Chains
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-09-10 , DOI: 10.1021/acs.inorgchem.9b01303 Bastien Leclercq 1 , Houria Kabbour 1 , Françoise Damay 2 , Claire V. Colin 3 , Alain Pautrat 4 , Angel M. Arevalo-Lopez 1 , Olivier Mentré 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-09-10 , DOI: 10.1021/acs.inorgchem.9b01303 Bastien Leclercq 1 , Houria Kabbour 1 , Françoise Damay 2 , Claire V. Colin 3 , Alain Pautrat 4 , Angel M. Arevalo-Lopez 1 , Olivier Mentré 1
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We have investigated two original hydrated cobalt arsenates based on Co2+ octahedral edge-sharing chains. Their different magnetocrystalline anisotropies induce different types of metamagnetic transitions: spin-flop versus spin-flip. In both compounds, a strong local anisotropy (Ising spins) is favored by the spin–orbit coupling present in the CoO6 octahedra, while ferromagnetic (FM) exchanges predominate in the chains. Co2(As2O7)·2H2O (1) orders antiferromagnetically below TN = 6.7 K. The magnetic structure is a noncollinear antiferromagnetic spin arrangement along the zigzag chains with DFT calculations implying frustrated chains and weakened anisotropy. A metamagnetic transition suggests a spin-flop process above μ0H = 3.2 T. In contrast, in BaCo2As2O8·2H2O (2) linear chains are arranged in disconnected layers, with only interchain ferromagnetic exchanges, therefore increasing its magnetocrystalline anisotropy. The magnetic structure is collinear with a magnetic easy axis that allows a spin-flop to a sharp spin-flip transition below TN = 15.1 K and above μ0H = 6.2 T.
中文翻译：
两个具有一维Co2 +链的砷酸钴的亚磁跃迁与磁晶各向异性
我们已经研究了基于Co 2+八面体边共享链的两种原始水合砷酸钴。它们不同的磁晶各向异性引起不同类型的亚磁跃迁：自旋翻转与自旋翻转。在这两种化合物中，CoO 6八面体中存在的自旋-轨道耦合有利于强局部各向异性（Ising自旋），而铁磁（FM）交换在链中占主导地位。Co 2（As 2 O 7）·2H 2 O（1）在T N以下反铁磁= 6.7K。磁性结构是沿着之字形链的非共线反铁磁自旋排列，DFT计算表明链条受挫，各向异性减弱。甲变磁过渡表明上述μ旋触发器过程0 ħ = 3.2 T.相反，在BACO 2作为2 ö 8 ·2H 2 O（2）的线性链排列在断开层，只有链间铁磁交换，因此增加了它的磁晶各向异性。磁结构是共线具有易磁化轴，其允许旋转触发器到低于尖锐自旋反转过渡Ť Ñ = 15.1 K和上述μ 0 H = 6.2 T.
更新日期：2019-09-11
中文翻译：
两个具有一维Co2 +链的砷酸钴的亚磁跃迁与磁晶各向异性
我们已经研究了基于Co 2+八面体边共享链的两种原始水合砷酸钴。它们不同的磁晶各向异性引起不同类型的亚磁跃迁：自旋翻转与自旋翻转。在这两种化合物中，CoO 6八面体中存在的自旋-轨道耦合有利于强局部各向异性（Ising自旋），而铁磁（FM）交换在链中占主导地位。Co 2（As 2 O 7）·2H 2 O（1）在T N以下反铁磁= 6.7K。磁性结构是沿着之字形链的非共线反铁磁自旋排列，DFT计算表明链条受挫，各向异性减弱。甲变磁过渡表明上述μ旋触发器过程0 ħ = 3.2 T.相反，在BACO 2作为2 ö 8 ·2H 2 O（2）的线性链排列在断开层，只有链间铁磁交换，因此增加了它的磁晶各向异性。磁结构是共线具有易磁化轴，其允许旋转触发器到低于尖锐自旋反转过渡Ť Ñ = 15.1 K和上述μ 0 H = 6.2 T.
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