Crystalline electric field excitations of the non-Fermi-liquid YbRh2Si2

We report on inelastic neutron scattering experiments on YbRh2Si2 Powder to study the magnetic excitation spectrum. The high-energy magnetic response at T = 1.5 K extends beyond 55 meV and is dominated by crystalline electric field excitations of the Yb3+ ions. The measurements yield a doublet ground state and three excited doublet states at approximately 17, 25, and 43 meV. (c) 2006 Elsevier B.V. All rights reserved.