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Probing the magnetic structure of GdCu2 by μSR spectroscopy

2002; Elsevier BV; Volume: 246; Issue: 1-2 Linguagem: Inglês

10.1016/s0304-8853(02)00036-7

1873-4766

F.N. Gygax, Daniel Andreica, A. Schenck, Yoshichika Ōnuki,

Rare-earth and actinide compounds

The magnetic structure of GdCu2 has been studied by zero-field μSR spectroscopy on a single crystal between 5 K and TN=39.6K. We find four distinct local fields composed of two widely spaced and narrowly split doublets at the μ+ position, determined to be a 4e interstitial site. The temperature dependencies of these local fields are peculiar. The four components decrease following precisely various unexpected −T3/2 relations up to almost 23TN, then they drop faster to reach zero at TN. At least up to 35 K the relative change as a function of temperature of the two high-field components is larger compared to the corresponding change of the low-field components. The local fields are consistent with the commensurate antiferromagnetic structure derived from neutron scattering studies, the μSR data, however, allow a refinement of the magnetic structure as regards small cantings of the Gd3+ moments.