Incommensurate spin-density-wave antiferromagnetism in CeRu${}_2$Al${}_2$B

Abstract

The newly discovered Ising-type ferromagnet CeRu${}_2$Al${}_2$B exhibits an additional phase transition at $T_{\text{N}}$ = 14.2 K before entering the ferromagnetic ground state at $T_{\text{C}}$ = 12.8 K. We clarify the nature of this transition through high resolution neutron diffraction measurements. The data reveal the presence of a longitudinal incommensurate spin-density wave (SDW) in the temperature range of $T_{\text{C}}<T<T_{\text{N}}$. The propagation vector $\mathbf{q}\sim (0,0,0.148)$ is nearly temperature independent in this region and discontinuously locks into $\mathbf{q}=0$ at $T_{\text{C}}$. Mean-field calculations of an effective Ising model indicate that the modulated SDW phase is stabilized by a strong competition between ferromagnetic and antiferromagnetic exchange interactions. This makes CeRu${}_2$Al${}_2$B a particularly attractive model system to study the global phase diagram of ferromagnetic heavy-fermion metals under influence of magnetic frustration.

4 pages, 4 figures

References in corpus (5)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Frustration and the Kondo effect in heavy fermion materials
• Magnetic field tuned quantum criticality of heavy fermion system YbPtBi
• Suppression of antiferromagnetic order and hybridization gap by electron- and hole-doping in the Kondo semiconductor CeOs${}_2$Al${}_{10}$
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Cited by in corpus (4)

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• Unconventional magnetism of the Kondo lattice