Magnetic Properties of the Frustrated fcc – Antiferromagnet HoB12 Above and Below T N

Anisotropy of Magnetoresistance in HoB12

“…Thus, the strong anisotropy and complex view of magnetic H−T phase diagram of HoB 12 may be explained in terms of the formation of a combined magnetically ordered state of localized 4f moments of Ho 3+ ions in combination with spin-polarized local areas of the 5d states-ferrons involved in the formation of spin density waves. The presence of the spin polarization was confirmed for HoB 12 in [3] where a ferromagnetic component of the order parameter was found in the magnetic neutron diffraction patterns. The detailed analysis of magnetic anisotropy of HoB 12 will be presented elsewhere.…”

“…In current work we present magnetoresistance (MR) investigation of metallic antiferromagnet HoB 12 (T N ≈ 7.4 K [1][2][3][4][5][6]). According to specific heat, magnetization and transport measurements [2][3][4][5][6], HoB 12 exhibits rather complicated magnetic structure. Indeed the results of neutron diffraction experiments show that incommensurate amplitude-modulated antiferromagnetic (AF) structure is formed below T N [4].…”

“…Indeed the results of neutron diffraction experiments show that incommensurate amplitude-modulated antiferromagnetic (AF) structure is formed below T N [4]. The topology of magnetic H−T phase diagram of HoB 12 which was reconstructed in [3][4][5] exhibits both nearly isotropic behavior representing weak dependence of the direction of applied magnetic field for T N (H) and considerable anisotropic character for field induced magnetic transitions inside AF state. Therefore to shed more light on the mechanisms responsible for the ground state formation of HoB 12 we present here a detailed investigation of MR anisotropy.…”

Bulk and Local Magnetic Susceptibility of ErB12

“…During the past decade antiferromagnetic (AF) dodecaborides ReB 12 containing rare-earth (Re) atoms in the sites of fcc lattice have received renewed attention [1,2]. In these compounds the AF-ordering of the ensemble of Re 3+ ions' magnetic moments is characterized by small enough Néel temperatures k B T N ≤ 1−2 meV [3], and ReB 12 were quoted as model systems to study the frustration effects in the fcc antiferromagnets [2].…”

“…In these compounds the AF-ordering of the ensemble of Re 3+ ions' magnetic moments is characterized by small enough Néel temperatures k B T N ≤ 1−2 meV [3], and ReB 12 were quoted as model systems to study the frustration effects in the fcc antiferromagnets [2].…”