A comparative study of electronic, structural, and magnetic properties ofα-,β-, andγ−Cu2V2

Spin Seebeck effect in the polar antiferromagnet α−Cu2V2O7

“…As illustrated in Fig. 1(a), all Cu 2+ ions form two sets of almost perpendicular zigzag chains [6][7][8][9].Magnetic properties of α-Cu 2 V 2 O 7 are governed by Cu 2+ S = 1/2 spins, since V 5+ ions are nonmagnetic. In the proposed spin Hamiltonian [10], there are three important terms to explain the magnetic properties of α-Cu 2 V 2 O 7 .…”

“…As illustrated in Fig. 1(a), all Cu 2+ ions form two sets of almost perpendicular zigzag chains [6][7][8][9].…”

“…α, β, and γ phases [6]. The structures of the β and γ phases are centrosymmetric, while the α phase possesses a noncentrosymmetric crystal structure with a polar point group (mm2) [6,7]. The space group of α-Cu 2 V 2 O 7 is F dd2 with lattice constants of a = 20.645Å, b = 8.383Å, and c = 6.442Å [8].…”

“…The oxide compound Cu 2 V 2 O 7 crystallizes in dichromate structure with three different polymorphs, i.e. α, β, and γ phases [6]. The structures of the β and γ phases are centrosymmetric, while the α phase possesses a noncentrosymmetric crystal structure with a polar point group (mm2) [6,7].…”

“…In the zigzag spin chains, Cu 2+ spins interact with their nearest neighbors. Since the magnetic interactions between nearest (J 1 ), second-nearest (J 2 ), and third-nearest (J 3 ) neighbors are all antiferromagnetic [6][7][8][9][10], α-Cu 2 V 2 O 7 exhibits antiferromagnetism. The second term is an anisotropic exchange interaction, which arises from the multiorbital correlation effect [10].…”