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Incommensurate spin-density-wave antiferromagnetism in CeRu2Al2B

Bhattacharyya, A; Khalyavin, DD; Krueger, F; Adroja, DT; Strydom, AM; Kockelmann, WA; Hillier, AD; (2016) Incommensurate spin-density-wave antiferromagnetism in CeRu2Al2B. Physical Review B , 93 (6) , Article 060410(R). 10.1103/PhysRevB.93.060410. Green open access

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Abstract

The newly discovered Ising-type ferromagnet CeRu2Al2B exhibits an additional phase transition at TN=14.2 K before entering the ferromagnetic ground state at TC=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 TC<T<TN. The propagation vector q∼(0,0,0.148) is nearly temperature independent in this region and discontinuously locks into q=0 at TC. 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 CeRu2Al2B a particularly attractive model system to study the global phase diagram of ferromagnetic heavy-fermion metals under the influence of magnetic frustration.

Type: Article
Title: Incommensurate spin-density-wave antiferromagnetism in CeRu2Al2B
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.93.060410
Publisher version: http://dx.doi.org/10.1103/PhysRevB.93.060410
Language: English
Additional information: Copyright © 2016 American Physical Society.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/1477394
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