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We characterize the properties of Ce1-xYbx,RhIn5 single crystals with 0 <= x <= 1 using measurements of powder x-ray diffraction, energy dispersive x-ray spectroscopy, electrical resistivity, magnetic susceptibility, specific heat, x-ray absorption near edge structure (XANES), and neutron diffraction. The Yb valence upsilon(Yb), calculated from the magnetic susceptibility and measured using XANES, decreases from 3+ at x = 0 to similar to 2.1+ at X-act = 0.2, where X-act is the measured Yb concentration. A transition from incommensurate to commensurate antiferromagnetism is observed in neutron diffraction measurements along Q = (0.5, 0.5, 1) between 0.2 <= X-act <= 0.27; this narrative is supported by specific-heat measurements in which a second robust feature appears at a temperature T-I (T-I < T-N) for the same concentration range. Magnetic susceptibility measurements also reveal features which provide additional evidence of magnetic ordering. The results of this study suggest that the evolution of the Yb valence plays a critical role in tuning the magnetic ground state of Ce1-xYbxRhIn5.


Physical Review B