Abstract
We have successfully synthesized single crystals of UAu0.8Sb2 using a flux method and present a comprehensive study of its physical properties by measuring the magnetic susceptibility, electrical resistivity and specific heat. Evidence for at least three magnetic phases is observed in the field-temperature phase diagram of UAu0.8Sb2. In zero field, the system undergoes an antiferromagnetic transition at 71 K, and upon further cooling it passes through another antiferromagnetic phase with a ferromagnetic component, before reaching a ferromagnetic ground state. A complex magnetic field-temperature phase diagram is obtained for fields along the easy c-axis, where the antiferromagnetic order eventually becomes polarized upon applying a magnetic field.
Highlights
We have successfully synthesized single crystals of UAu0.8Sb2 using a flux method and present a comprehensive study of its physical properties by measuring the magnetic susceptibility, electrical resistivity and specific heat
The “112” uranium-based ternary compounds UTX2 (T = transition metal, X = pnictogen) are a good platform to study the competing interactions, which can be tuned by varying the transition metal or the site occupancies[11,12,13,14,15,16]
We report the synthesis of UAu0.8Sb2 single crystals using a self-flux method and study the physical properties using electrical resistivity, magnetic susceptibility and heat capacity
Summary
We have successfully synthesized single crystals of UAu0.8Sb2 using a flux method and present a comprehensive study of its physical properties by measuring the magnetic susceptibility, electrical resistivity and specific heat. In many U-based compounds, the Kondo effect can quench the localized magnetic moments and lead to a non-magnetically-ordered heavy-fermion state while another competing interaction, the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction couples localized spins and favors long-range magnetic order The competition between these effects can lead to a variety of interesting physical phenomena, such as heavy-fermion behavior and unconventional superconductivity in UPt33,4, hidden order in URu2Si25–7, ferromagnetism in UAuBi28, and the coexistence of superconductivity and ferromagnetism in URhGe9 and UCoGe10. UNi0.5Sb2 has been found to display a different magnetic ordering temperature, with two further anomalies at lower temperatures[14] As such it is important to examine the magnetic properties of single crystals of partially occupied compounds in the UT1-xSb2 series, which may help understand how the complex magnetism may be tuned. Compound Crystal system, space group Cell parameters (nm) Volume (nm3) Rietveld reliability factors Rp Rwp χ2
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