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Tuning the Magnetic Ground State of Ce1-xYbxRhIn5 by Yb Valence Fluctuations



S. Jang, N. Pouse, T. Keiber, B. D. White, S. M. Disseler, Jeffrey W. Lynn, J. C. Collini, M. Janoschek, F. Bridges, M. B. Maple


We characterize the properties of Ce1-xYbxRhIn5 single crystals with 0 {less than or equal to} x {less than or equal to} 1 using measurements of powder x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDS), electrical resistivity, magnetic susceptibility, specific heat, x-ray absorption near edge structure (XANES), and neutron diffraction. The Yb valence, υYb, calculated from the magnetic susceptibility and measured using XANES, decreases from 3+ at X = 0 to ~2.1+ at Xact - 0.2, where xact is the measured Yb concentration. A transition from incommensurate to commensurate antiferromagnetism (AFM) is observed in neutron diffraction measurements along Q = (0.5, 0.5 l) between 0.2 {less than or equal to}xact{less than or equal to}0.27; this narrative is supported by specific heat measurements in which a second robust feature appears at a temperature T1(T1n) 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


Yb doped CeRhIn5, neutron diffraction, Neel Order, bulk measurements, incommensurate order, transition to commensurate order
Created November 16, 2018, Updated February 27, 2019