Critical-point anomalies in doped CeRhIn5

The heavy-fermion compound CeRhIn\(_5\) can be tuned through a quantum critical point, when In is partially replaced by Sn. This way additional charge carriers are introduced and the antiferromagnetic order is gradually suppressed to zero temperature. Here we investigate the temperature-dependent op...

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Bibliographic Details
Published inarXiv.org
Main Authors Renjith Mathew Roy, Pal, Sudip, Yang, Run, Roh, Seulki, Shin, Soohyeon, Park, Tae Beom, Park, Tuson, Dressel, Martin
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 25.10.2023
Subjects
Anomalies
Antiferromagnetism
Critical point
Current carriers
Fermi liquids
Fermions
Low temperature
Optical properties
Single crystals
Temperature
Temperature dependence
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Summary:The heavy-fermion compound CeRhIn\(_5\) can be tuned through a quantum critical point, when In is partially replaced by Sn. This way additional charge carriers are introduced and the antiferromagnetic order is gradually suppressed to zero temperature. Here we investigate the temperature-dependent optical properties of CeRh(In\(_{1-x}\)Sn\(_x\))\(_5\) single crystals for \(x = 4.4\%\), \(6.9\%\) and \(9.8\%\). With increasing Sn concentration the infrared conductivity reveals a clear enhancement of the \(c\)-\(f\) hybridization strength. At low temperatures we observed a non-Fermi-liquid behavior in the frequency dependence of the scattering rate and effective mass in all three compounds. In addition, below a characteristic temperature \(T^* \approx 10\) K, the temperature dependent resistivity \(\rho(T)\) follows a \(\log T\) behavior, typical for a non-Fermi liquid. The temperature-dependent magnetization also exhibits anomalous behavior below \(T^*\). Our investigation reveal that below \(T^*\) the system shows a pronounced non-Fermi-liquid behavior and \(T^*\) monotonically increases as the quantum critical point is approached.
ISSN:2331-8422