arXiv 2603.237402026-03-24cond-mat.str-el

通过光学和cyclotron有效质量的差异调和CeCoIn$_5$中的奇异金属输运

Reconciling strange metal transport in CeCoIn$_5$ through the difference of optical and cyclotron effective masses

National High Magnetic Field Laboratory, Los Alamos National Laboratory（国家高磁场实验室，洛斯阿拉莫斯国家实验室）；William H. Miller III Department of Physics and Astronomy, Johns Hopkins University（约翰霍普金斯大学威廉H米勒三世物理与天文学系）；Department of Physics, Cornell University（康奈尔大学物理系）；Institute for Materials Science, Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室材料科学研究所）；Department of Materials Science and Engineering, Cornell University（康奈尔大学材料科学与工程系）；Leibniz-Institut für Kristallzüchtung（莱布尼兹晶体生长研究所）；Kavli Institute at Cornell for Nanoscale Science（康奈尔卡弗里纳米科学研究所）

Jingyuan Wang, Zhenisbek Tagay, Liyu Shi, Jiahao Liang, Nghiep Khoan Duong, Yi Wu, P. M. T. Vianez, F. Ronning, D. G. Rickel, Darrell G. Schlom, K. M. Shen, S. … 展开作者

Jingyuan Wang, Zhenisbek Tagay, Liyu Shi, Jiahao Liang, Nghiep Khoan Duong, Yi Wu, P. M. T. Vianez, F. Ronning, D. G. Rickel, Darrell G. Schlom, K. M. Shen, S. A. Crooker, N. P. Armitage

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AI总结：

研究通过THz光谱揭示CeCoIn$_5$中奇异金属态的电流弛豫率与温度平方成正比，表明隐含的费米液体态，解释了其电阻率与Hall角的异常行为。

摘要：

在铜基超导体中，奇异金属行为表现为温度线性电阻率和异常霍尔输运，与传统费米液体理论预期相悖。类似输运行为也在重费米金属CeCoIn$_5$中观察到，其d波超导基态和强反铁磁波动与铜基超导体相似。本文利用时间域太赫兹光谱（TDTS）研究了CeCoIn$_5$奇异金属态的光学导电性，发现电流弛豫率近似与温度平方成正比，表明在宽磁场范围内存在隐含的费米液体态。这一结果可通过认识到重准粒子的光学质量近似与1/T成正比来与温度线性电阻率调和。光学质量与描述cyclotron运动的质量不同，后者不经历相同的温度依赖性重整化。尽管本身异常，这有助于理解CeCoIn$_5$中其他现象，包括常规T$^2$依赖的霍尔角余弦值与温度线性电阻率的共存，这与我们的观察也反映了类似费米液体的物理。

英文摘要：

The strange metal behavior in cuprate superconductors - characterized by linear in temperature resistivity and anomalous Hall transport - stands in stark contrast to the expectation of conventional Fermi liquid (FL) theory. Remarkably, the similar transport behavior has also been observed in the heavy fermion metal CeCoIn$_5$, whose d-wave superconducting ground state and strong antiferromagnetic fluctuations draw parallels to the cuprates. Here we have investigated the optical conductivity of the strange metal state of CeCoIn$_5$ over a wide magnetic field range using time-domain THz spectroscopy (TDTS). Using unique high-field THz spectroscopy we have shown that the current relaxation rate scales approximately as T$^2$, giving evidence for a hidden Fermi liquid state over a large field range. This result can be reconciled with linear in T resistivity with the realization that heavy quasiparticles have an optical mass that scales roughly like 1/T. This optical mass contrasts with the mass that characterizes cyclotron motion, which does not suffer the same large temperature dependent renormalization. Although by itself anomalous, this allows one to understand a number of other phenomena in CeCoIn$_5$ that have been taken to be signatures of strange metals, including the coexistence of a conventional T$^2$ dependence of the cotangent of the Hall angle with the linear in T resistivity, which with our observation also reflects FL-like physics.

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