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Antiferromagnetism of type II in nonstoichiometric YbP
Authors:A Dönni  P Fischer  A Furrer  P Bonville  F Hulliger  H R Ott
Institution:(1) Laboratory for Neutron Scattering, ETH Zürich, CH-5232 Villigen-PSI, Switzerland;(2) Service de Physique du Solide et de Résonance Magnétique, Centre d'Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette, France;(3) Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland
Abstract:A polycrystalline smaple of nonstoichiometric ytterbium phosphide, YbP0.84, was investigated by neutron scattering, Mössbauer spectroscopy and bulk magnetic measurements. Neutron diffraction experiments prove the existence of antiferromagnetic type II ordering belowT N =0.64 K, in contrast to the observed antiferromagnetic type III ordering in the stoichiometric Kondo-like compounds YbN and YbAs. The temperature dependence of the average ordered magnetic moment per Yb3+ ion with saturation value mgrYb = 1.03(7)mgr B is similar to that of YbN. Mössbauer experiments prove the magnetic phase transition to be first order with different regions in the sample having slightly different transition temperatures. By means of inelastic neutron scattering the crystal-field level scheme was established to beGcy 6Gcy 8(19meV) –Gcy 7(43meV).
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