Magnetic properties of RFe${}_2$Zn${}_{20}$ and RCo${}_2$Zn${}_{20}$(R = Y, Nd, Sm, Gd - Lu)

Abstract

Magnetization, resistivity and specific heat measurements were performed on single crystals of RFe${}_2$Zn${}_{20}$ and RCo${}_2$Zn${}_{20}$(R = Y, Nd, Sm, Gd - Lu). Whereas LuCo${}_2$Zn${}_{20}$ and YCo${}_2$Zn${}_{20}$ manifest unremarkable, metallic behavior, LuFe${}_2$Zn${}_{20}$ and YFe${}_2$Zn${}_{20}$ manifest behaviors characteristic of nearly ferromagnetic Fermi liquids. When the well defined $4f$ local moments (Gd${}^{3+}$ - Tm${}^{3+}$) were embedded into this strongly polarizable host, they all manifest enhanced, ferromagnetic ordering and the values of $T_{\mathrm{C}}$ for RFe${}_2$Zn${}_{20}$ (R = Gd - Tm) scale with the de Gennes factor. In addition, the data on the RFe${}_2$Zn${}_{20}$ compounds indicate a small crystal electronic field (CEF) effect, compare with the interaction energy scale. On the other hand, the local moment bearing members of RCo${}_2$Zn${}_{20}$ (R = Nd, Sm, Gd - Tm) manifest weak magnetic interactions and the magnetic properties for R = Dy - Tm members are strongly influenced by the CEF effect on the R ions. The magnetic anisotropy and specific heat data for the Co series were used to determine the CEF coefficient of R ion in the cubic coordination. These CEF coefficients, determined for the Co series, are consistent with the magnetic anisotropy and specific heat data for the Fe series, which indicates similar CEF effects for the Fe and Co series. Such analysis, combined with specific heat and resistivity data, indicates that for R = Tb - Ho, the CEF splitting scale is smaller than their $T_{\mathrm{C}}$ values, whereas for ErFe${}_2$Zn${}_{20}$ and TmFe${}_2$Zn${}_{20}$ the $4f$ electron loses part of its full Hund's rule ground state degeneracy above $T_{\mathrm{C}}$. YbFe${}_2$Zn${}_{20}$ and YbCo${}_2$Zn${}_{20}$ manifest typical, but distinct heavy Fermion behaviors associated with different Kondo temperatures.

48 pages, 44 figures

References in corpus (3)

• YSix closely related YbT${}_2$Zn${}_{20}$ (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
• Variation of the magnetic ordering in GdT${}_2$Zn${}_{20}$ (T= Fe, Ru, Os, Co, Rh and Ir) and its correlation with the electronic structure of isostructural YT${}_2$Zn${}_{20}$
• Magnetic properties of Gd_xY_{1-x}Fe_2Zn_{20}: dilute, large, $\text{S}$ moments in a nearly ferromagnetic Fermi liquid

Cited by in corpus (24)

• Unusual Field-Insensitive Phase Transition and Kondo Behavior in SmTi${}_2$Al${}_{20}$
• Preserved entropy and fragile magnetism
• Magnetic Order in TbCo2Zn20 and TbFe2Zn20
• Thermoelectric Power of the YbT${}_2$Zn${}_{20}$ (T = Fe, Ru, Os, Ir, Rh, and Co) Heavy Fermions
• Crystal Chemistry and Magnetic Properties of Manganese Zinc Alloy "YMn2Zn20" Comprising a Mn Pyrochlore Lattice
• Multiband electronic characterization of the complex intermetallic cage system Y${}_{1-x}$Gd${}_x$Co${}_2$Zn${}_{20}$
• Enhancement of Curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20
• Search for Pressure Induced Quantum Criticality in YbFe2Zn20
• Tuning the electronic hybridization in the heavy fermion cage compound YbFe${}_2$Zn${}_{20}$ with Cd-doping
• Anisotropic transport and magnetic properties, and magnetic-field tuned states of CeZn11 single crystals
• Mesoscopic Stoner instability in open quantum dots: suppression of Coleman-Weinberg mechanism by electron tunneling
• Magnetic and Thermal Properties of SmRh${}_2$Zn${}_{20}$ Single Crystal
• Low Curie-temperature ferromagnetic phase in SmPt2Cd20 possibly accompanied by strong quantum fluctuations
• Tuning the Kondo effect in Yb(Fe${}_{1-x}$Co${}_x$)${}_2$Zn${}_{20}$
• Study of 57Fe Mossbauer effect in RFe2Zn20 ( R = Lu, Yb, Gd)
• Magnetic Properties of RFe2Si2 and R(Fe1-xMx)2Si2 Systems (R=La, Y and Lu, M= Ni, Mn and Cu)
• Inelastic neutron scattering study of crystalline electric field excitations in the caged compounds NdT2Zn20 (T = Co, Rh, and Ir)
• Collapse of Kondo state and ferromagnetic quantum phase transition in YbFe${}_2$Zn${}_{20}$
• Magnetic properties of Gd$T_2$Zn${}_{20}$ (T = Fe, Co) investigated by X-ray diffraction and spectroscopy
• Nearly itinerant ferromagnetism in CaNi2 and CaNi3
• Comment on "Unconventional enhancement of ferromagnetic interactions in Cd-doped GdFe2Zn20 single crystals studied by ESR and 57Fe Mossbauer spectroscopies"
• Structural Trends and Itinerant Magnetism of the New Cage-structured Compound HfMn${}_2$Zn${}_{20}$
• Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20
• Growth and characterization of BaZnGa