University of Connecticut

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Condensed Matter Physics Seminar

Tuesday, September 4, 2018
2:00pm – 3:00pm

Storrs Campus
Gant West (Physics Building), P121

Dr. Marein Rahn, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

RIXS study of the Anderson Lattice compound CePd3

Intermediate valence (IV) materials represent one of the longest standing issues in quantum materials physics [1]. In CePd3, the correlation of localized and itinerant electrons results in an ambivalent state that strongly fluctuates between the Ce4+ (4f0) and Ce3+ (4f1) configurations. The most striking manifestation of this Kondo hybridization of 4f electrons with a sea of transition metal states occurs at low temperatures, where the valence fluctuations may develop coherency. The few available neutron spectroscopic studies of such coherent “Anderson Lattices” have revealed that the phenomenon is associated with unusual quasiparticle excitations across the hybridization gap [2]. The low temperature dynamic magnetic susceptibility thus acquires a characteristic energy-/momentum-space texture. The recent advances in soft x-ray resonant inelastic scattering (RIXS) are among the most anticipated developments at 3rd generation synchrotrons. With an energy resolution on the order of E/dE=30000, soft RIXS is now able to address the small energy scale of the IV phenomenon [3]. I present the first use of Ce M-edge RIXS to reveal the evolution of a low temperature coherently hybridized state in CePd3.

[1] J. M. Lawrence et al., Valence Fluctuation Phenomena, Rep. Prog. Phys 44, 1 (1981)

[2] E. Goremychkin et al., Coherent band excitations in CePd3, Science 359, 186 (2018)

[3] N. B. Brookes et al., The beamline ID32 at the ESRF, Nuc. Inst. Meth. Phys. Res. Sec. A. 903, 175 (2018)


Prof. J. Hancock

Physics Department (primary), UConn Master Calendar

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