Title: Elucidating the lack of magnetic order in the heavy fermion CeCu2Mg
Language: English
Authors: Michor, Herwig
Sereni, Julian G. 
Giovannini, Mauro 
Kampert, Erik 
Salamakha, Leonid 
Hilscher, Gerfried 
Bauer, Ernst
Category: Research Article
Issue Date: 2017
Journal: Physical Review B
ISSN: 1098-0121
Magnetic, transport, and thermal properties of CeCu2Mg are investigated to elucidate the lack of magnetic order in this heavy-fermion compound with a specific heat value, Cmag/T|T0 ≈ 1.2 J/mol K² and robust effective magnetic moments (μeff ≈ 2.46 μB). The lack of magnetic order is attributed to magnetic frustration favored by the hexagonal configuration of the Ce sublattice. In fact, the effect of magnetic field on Cmag/T and residual resistivity ρ0 does not correspond to that of a Fermi liquid (FL) because a broad anomaly appears at Tmax ≈ 1.2 K in Cmag(T)/T, without changing its position up to μoH=7.5 T. However, the flattening of Cmag/T|T0 and its magnetic susceptibility χ(T0), together with the T² dependence of ρ(T), reveal a FL behavior for T ≤ 2 K which is also supported by Wilson and Kadowaki-Woods ratios. The unusual coexistence of FL and frustration phenomena can be understood by placing paramagnetic CeCu2Mg in an intermediate section of a frustration-Kondo model. The entropy, Smag, reaches 0.87 Rln6 at T ≃ 100 K, with a tendency to approach the expected value Smag = Rln6 of the J=5/2 ground state of Ce3+.
Keywords: frustrated magnetism; triangular lattice; Kondo lattice
DOI: 10.1103/PhysRevB.95.115146
Library ID: AC15626656
URN: urn:nbn:at:at-ubtuw:3-9669
Organisation: E138 - Institut für Festkörperphysik 
Publication Type: Article
Appears in Collections:Article

Files in this item:

Show full item record

Page view(s)

checked on Jun 13, 2021


checked on Jun 13, 2021

Google ScholarTM


Items in reposiTUm are protected by copyright, with all rights reserved, unless otherwise indicated.