Abstract
Single crystals of (Lu1−xY bx)3Rh4Ge13 were characterized by magnetization, specific heat, and electrical resistivity measurements. Doping Yb into the non-magnetic Lu3Rh4Ge13 compound tunes this cubic system’s properties from a superconductor with disordered metal normal state (x < 0.05) to a Kondo for 0.05 ≤ x ≤0.2 and intermediate valence at the highest Yb concentrations. The evidence for intermediate Yb valence comes from a broad maximum in the magnetic susceptibility and X-ray photoelectron spectroscopy. Furthermore, the resistivity displays a local maximum at finite temperatures at intermediate compositions x, followed by apparent metallic behavior closest to the Yb end compound in the series.
Highlights
Single crystals of (Lu1−xYbx)3Rh4Ge13 were characterized by magnetization, specific heat, and electrical resistivity measurements
Intermediate valence states generally form with electronically unstable rare earths like Ce, Yb, Eu, and Sm.[1,6,7,8]
The f electron levels in such systems are close to the s-d band favoring an intermediate valence state
Summary
(Received 1 January 2015; accepted 17 February 2015; published online 2 March 2015) Single crystals of (Lu1−xYbx)3Rh4Ge13 were characterized by magnetization, specific heat, and electrical resistivity measurements.
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