Quantum phase transition in the heavy-fermion compound YbIr$_2$Si$_2$

We investigate the pressure-temperature phase diagram of YbIr $_{2}$ Si $_{2}$ by measuring the electrical resistivity $ρ (T)$ . In contrast to the widely investigated YbRh $_{2}$ Si $_{2}$ , YbIr $_{2}$ Si $_{2}$ is a paramagnetic metal below $p_{c} ≃ 8$ GPa. Interestingly, a first-order, presumably ferromagnetic, transition develops at $p_{c}$ . Similar magnetic properties were also observed in YbRh $_{2}$ Si $_{2}$ and YbCu $_{2}$ Si $_{2}$ at sufficiently high pressures, suggesting a uniform picture for these Yb compounds. The ground state of YbIr $_{2}$ Si $_{2}$ under pressure can be described by Landau Fermi-liquid (LFL) theory, in agreement with the nearly ferromagnetic Fermi-liquid (NFFL) model. Moreover, evidence of a weak valence transition, characterized by a jump of the Kadowaki-Woods (KW) ratio as well as an enhancement of the residual resistivity $ρ_{0}$ and of the quasiparticle-quasiparticle scattering cross section, is observed around 6 GPa.

Quantum phase transition in the heavy-fermion compound YbIr $_{2}$ Si $_{2}$

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Quantum phase transition in the heavy-fermion compound YbIr $_{2}$ Si $_{2}$

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Quantum phase transition in the heavy-fermion compound YbIr22​Si22​

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Quantum phase transition in the heavy-fermion compound YbIr22​Si22​

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Quantum phase transition in the heavy-fermion compound YbIr $_{2}$ Si $_{2}$

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AI智能校验

Quantum phase transition in the heavy-fermion compound YbIr $_{2}$ Si $_{2}$

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