期刊
ACTA PHYSICA POLONICA A
卷 126, 期 1, 页码 318-321出版社
POLISH ACAD SCIENCES INST PHYSICS
DOI: 10.12693/APhysPolA.126.318
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We give a first report of the physical properties of the pair of cubic intermetallic compounds R3Rh4Ge13, with R being either Yb or Lu. The crystal structure can be described in terms of 3 atomic cages, and we reveal how certain thermal physical properties are inherent to this particular atomic layout. Close to room temperature, Yb3Rh4Ge13 displays strong paramagnetism originating from Yb3+ ions, but upon cooling though 100 K the magnetic susceptibility and electrical resistivity behave according to a thermally driven valence instability, and we classify Yb3Rh4Ge13 therefore as an intermediate valent f-electron system. Lu3Rh4Ge13 behaves in a diamagnetic manner throughout our accessible temperature range, first with a weakly temperature-dependent magnetic susceptibility below room temperature, and finally with a precipitous drop in the electrical resistivity to zero at 2.5 K when superconductivity sets in.
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