Crystalline Electric Field Excitations in the Heavy Fermion Superconductor CeCoIn_5

Details Crystalline Electric Field Excitations in the Heavy Fermion Superconductor CeCoIn_5 Crystalline Electric Field Excitations in the Heavy Fermion Superconductor CeCoIn_5

2004-01-23

arxiv.org/abs/cond-mat/0401463v1

Physics

Condensed Matter

Strongly Correlated Electrons

uses latex packages revtex4,amsmath,graphicx,natbib, 9th Annual MMM-Intermag Conference, (Accepted for publication in J. Appl.

Scientific paper

10.1063/1.1667444

The crystalline electric field (CEF) energy level scheme of the heavy fermion superconductor CeCoIn_5 has been determined by means of inelastic neutron scattering (INS). Peaks observed in the INS spectra at 8 meV and 27 meV with incident neutron energies between E_i=30-60 meV and at a temperature T = 10 K correspond to transitions from the ground state to the two excited states, respectively. The wavevector and temperature dependence of these peaks are consistent with CEF excitations. Fits of the data to a CEF model yield the CEF parameters B^0_2=-0.80 meV, B^0_4=0.059 meV, and |B^4_4|= 0.137 meV corresponding to an energy level scheme: Gamma_7^(1) (0)[=0.487|+/-5/2> - 0.873|-/+3/2>], Gamma_7^(2) (8.6 meV, 100 K), and Gamma_6 (24.4 meV, 283 K).

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