R Rh2 Al 10 ( R = Ce, Yb): New intermetallic compounds in the 1: 2: 10 stoichiometry seriesстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The orthorhombic, space group Cmcm YbFe2Al10 structure type series of compounds are known to form with
practically the entire series of rare-earth elements R, but only with the three d − electron elements Fe, Ru, and
Os. The Ce-derivatives in particular have been of much interest since the first reports of their highly unusual
physical properties. Classified as Kondo insulators, CeRu2Al10 and CeOs2Al10 controversially order magnetically
and with uncharacteristically high Néel temperatures of ≃28 K. CeFe2Al10 on the other hand shows pronounced
semiconducting and Kondo features but remains paramagnetic. As part of our ongoing studies into the rich
physics of this class of materials we have succeeded in synthesizing new members of the 1:2:10 stoichiometry
involving the chemical element Rh for the first time. CeRh2Al10 is found to crystallize in the tetragonal system
with space group I41/amd. Yb Rh2Al10 on the other hand forms in the serial Cmcm orthorhombic structure type.
We discuss important similarities between the two types. At 5.310 Å the shortest Ce–Ce distance is, likewise to
the situation in CeRu2Al10 and CeOs Al 2 10 , also well above the Hill limit of 3.40 Å. Despite the cage-like structure
and large rare-earth separation distances, this study reveals the onset of long-range magnetic ordering in
CeRh2Al10 at 3.9 K. The magnetic ordering develops out of an incoherent Kondo state that dominates the
electrical resistivity below about 40 K.