Ferromagnetic ordering along the hard axis in the Kondo lattice YbIr3Ge7
arXiv:1901.02489 · doi:10.1103/PhysRevB.99.121109
Abstract
Ferromagnetic Kondo lattice compounds are far less common than their antiferromagnetic analogs. In this work, we report the discovery of a new ferromagnetic Kondo lattice compound, YbIr3Ge7. Like almost all ferromagnetic Kondo lattice systems, YbIr3Ge7 shows magnetic order with moments aligned orthogonal to the crystal electric field (CEF) easy axis. YbIr3Ge7 is unique in that it is the only member of this class of compounds that crystallizes in a rhombohedral structure with a trigonal point symmetry of the magnetic site, and it lacks broken inversion symmetry at the local moment site. AC magnetic susceptibility, magnetization, and specific heat measurements show that YbIr3Ge7 has a Kondo temperature TK = 14 K and a Curie temperature TC = 2.4 K. Ferromagnetic order occurs along the crystallographic [100] hard CEF axis despite the large CEF anisotropy of the ground state Kramers doublet with a saturation moment along [001] almost four times larger than the one along [100]. This implies that a mechanism which considers the anisotropy in the exchange interaction to explain the hard axis ordering is unlikely. On the other hand, the broad second-order phase transition at TC favors a fluctuation-induced mechanism.
References in corpus (9)
- Fermi-liquid instabilities at magnetic quantum phase transitions
- Multiple energy scales at a quantum critical point
- CeRuPO: A rare example of a Ferromagnetic Kondo lattice
- Relevance of ferromagnetic correlations for the Electron Spin Resonance in Kondo lattice systems
- Incoherent non-Fermi liquid scattering in a Kondo lattice
- Single crystal growth and anisotropy of CeRuPO
- Magnetic hard-axis ordering near ferromagnetic quantum criticality
- Magnetic anisotropy of YbNi4P2
- Pressure-induced ferromagnetism with strong Ising-type anisotropy in YbCuSi