论文标题
ce $ _ {1-x} $ nd $ _x $ coin $ _5 $中的缩放不变性的普朗克金属和量子关键
The scaled-invariant Planckian metal and quantum criticality in Ce$_{1-x}$Nd$_x$CoIn$_5$
论文作者
论文摘要
与通用散射率相关的完美$ T $ - 线性电阻率：$ 1/τ=αk_bt/\ hbar $，$α\ sim 1 $，所谓的普兰克金属状态，在正常状态下，在各种紧密相关的超导体相关的超级导体接近量子关键点附近。但是，这种有趣现象及其与量子临界的联系的微观起源仍然是一个重大的开放问题。 In this work, we observe the quantum-critical $T/B$-scaling of the Planckian metal state in the resistivity and heat capacity of heavy-electron superconductor Ce$_{1-x}$Nd$_x$CoIn$_5$ in magnetic fields near the edge of antiferromagnetism, driven by critical Kondo hybridization at the critical doping $x_c \sim 0.03 $。我们进一步提供了第一种微观机制，以基于$ x_c $在quasi-two-two-two-two-two-two kondo-heisenberg lattice模型中的Kondo崩溃过渡附近的关键电荷波动来解释普朗克状态。该机制同时捕获了观察到的普遍普兰克散射率，以及接近临界点的热力学可观察物中观察到的量子量表和幂律差异。我们的机制是普朗克金属状态的通用机制，在近托破坏附近的各种量子关键超导体中。
Perfect $T$-linear resistivity associated with universal scattering rate: $1/τ=αk_B T/\hbar$ with $α\sim 1$, so-called Planckian metal state, has been observed in the normal state of a variety of strongly correlated superconductors close to a quantum critical point. However, the microscopic origin of this intriguing phenomena and its link to quantum criticality still remains an outstanding open problem. In this work, we observe the quantum-critical $T/B$-scaling of the Planckian metal state in the resistivity and heat capacity of heavy-electron superconductor Ce$_{1-x}$Nd$_x$CoIn$_5$ in magnetic fields near the edge of antiferromagnetism, driven by critical Kondo hybridization at the critical doping $x_c \sim 0.03$. We further provide the first microscopic mechanism to account for the Planckian state in a quantum critical system based on the critical charge fluctuations near Kondo breakdown transition at $x_c$ within the quasi-two-dimensional Kondo-Heisenberg lattice model. This mechanism simultaneously captures the observed universal Planckian scattering rate as well as the quantum-critical scaling and power-law divergence in thermodynamic observables near criticality. Our mechanism is generic to Planckian metal states in a variety of quantum critical superconductors near Kondo destruction.
