Spontaneous and field-induced magnetic phase transitions in Dy2Co3Al9: Effects of exchange frustration
Spontaneous and field-induced magnetic phase transitions in Dy2Co3Al9: Effects of exchange frustration
Gorbunov, D. I.; Henriques, M. S.; Qureshi, N.; Ouladdiaf, B.; Salazar Mejia, C.; Gronemann, J.; Andreev, A. V.; Petricek, V.; Green, E. L.; Wosnitza, J.
Abstract
Due to the long-range oscillatory character of RKKY exchange interactions, for Dy2Co3Al9 there exist positive and negative couplings between theDymagnetic moments that lead to magnetic frustration. As a result, the ground state can be easily perturbed, and the system displays a number of spontaneous and field-induced phase transitions. We performed magnetization, magnetic-susceptibility, specific-heat, and electrical-resistivity measurements as well as neutron-diffraction experiments on a single crystal. We find two transitions to distinct incommensurate antiferromagnetic phases at 6.2 and 5.2 K that evolve to a commensurate phase at 3.7 K. In applied magnetic field, new phases emerge. Field-dependent magnetization exhibits a multistep metamagnetic process with sharp transitions accompanied by pronounced magnetoresistance changes. The large number of phases and their complex magnetic structures suggest that the physical properties of Dy2Co3Al9 are ruled by exchange frustration in the presence of a large magnetocrystalline anisotropy.
Beteiligte Forschungsanlagen
- Hochfeld-Magnetlabor (HLD)
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Physical Review Materials 2(2018), 084406
DOI: 10.1103/PhysRevMaterials.2.084406
Cited 6 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-27821