Journal
NEW JOURNAL OF PHYSICS
Volume 20, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aace35
Keywords
heavy-fermions; crystal electric field; density functional theory; basal plane anisotropy
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Funding
- Grant Agency of Czech Republic [15-03777S]
- DFG Research Unit 'Quantum Phase Transitions' [960]
- DFG [KR3831/4-1, SFB 1143]
- DFG via project Fermi-Nest [GE602/4-1]
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The crystal electric field (CEF) scheme ofYbNi(4)P(2) is determined, based on experimental data from inelastic neutron scattering, heat capacity, susceptibility and NMR measurements. Despite the tetragonal crystal structure, 9 parameters are needed to describe the crystal field in YbNi4P2 due to the orthorhombic site symmetry of the Yb ion. A large basal plane anisotropy is detected by the local probe NMR. Our analysis yields CEF excitation energies of 8.5, 12.5 and roughly 30 meV and a ground state wave function that is dominated by the 5/2 state. Furthermore, we present an analysis of the CEF scheme based on density functional theory calculations, which confirms the large basal plane anisotropy.
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