Abstract
The $f$-electron compound CeAuSb${}_{2}$, which crystallizes in the ZrCuSi${}_{2}$-type tetragonal structure, orders antiferromagnetically between 5 and 6.8 K, where the antiferromagnetic transition temperature ${T}_{N}$ depends on the occupancy of the Au site. Here we report the electrical resistivity and heat capacity of a high-quality crystal CeAuSb${}_{2}$ with ${T}_{N}$ of 6.8 K, the highest for this compound. The magnetic transition temperature is initially suppressed with pressure, but is intercepted by a new magnetic state above 2.1 GPa. The new phase shows a dome shape with pressure and coexists with another phase at pressures higher than 4.7 GPa. The electrical resistivity shows a ${T}^{2}$ Fermi-liquid behavior in the complex magnetic state, and the residual resistivity and the ${T}^{2}$ resistivity coefficient increases with pressure, suggesting the possibility of a magnetic quantum critical point at a higher pressure.
Highlights
Cerium-based compounds have attracted attention because they exhibit a variety of interesting phenomena, such as heavy fermion, magnetic, and unconventional superconducting states.[1,2,3] Especially, magnetically ordered Ce compounds have been model systems for exploring the interplay between magnetism and superconductivity, where the ground state is determined by the balance between Ruderman-Kittel-Kasuya-Yosida (RKKY) and Kondo interactions.[4]
J is the exchange coupling between the Ce 4f spin and the conduction electrons and N(EF ) is the density of states at the Fermi level EF. The fact that these two competing interactions depend on JN(EF ), which can be tuned by non-thermal parameters such as magnetic field, chemical composition or pressure, provides an avenue to control the magnetic transition temperature to T = 0 K, a quantum-critical point (QCP).[5,6,7]
Non-Fermi liquid (NFL) states that are characterized by a divergence of the effective mass and deviation from a T 2 dependent resistivity at low temperatures have been shown to occur due to the abundant quantum fluctuations associated with the QCP.[5]
Summary
Powered by the California Digital Library University of California arXiv:1203.5164v1 [cond-mat.str-el] 23 Mar 2012. Park[1 1] Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea 2 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. The f-electron compound CeAuSb2, which crystallizes in the ZrCuSi2-type tetragonal structure, orders antiferromagnetically between 5 and 6.8 K, where the antiferromagnetic transition temperature TN depends on the occupancy of the Au site. We report the electrical resistivity and heat capacity of a high-quality crystal CeAuSb2 with TN of 6.8 K, the highest for this compound. The electrical resistivity shows a T 2 Fermi liquids behavior in the complex magnetic state, and the residual resistivity and the T 2 resistivity coefficient increases with pressure, suggesting the possibility of a magnetic quantum critical point at a higher pressure
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