Anomalous change in the de Haas-van Alphen oscillations of CeCoIn${}_5$ at ultra-low temperatures

Abstract

We have performed de Haas-van Alphen (dHvA) measurements of the heavy-fermion superconductor CeCoIn${}_5$ down to 2 mK above the upper critical field. We find that the dHvA amplitudes show an anomalous suppression, concomitantly with a shift of the dHvA frequency, below the transition temperature $T_{\mathrm{n}}=20$ mK. We suggest that the change is owing to magnetic breakdown caused by a field-induced antiferromagnetic (AFM) state emerging below $T_{\mathrm{n}}$, revealing the origin of the field-induced quantum critical point (QCP) in CeCoIn${}_5$. The field dependence of $T_{\mathrm{n}}$ is found to be very weak for 7--10 T, implying that an enhancement of AFM order by suppressing the critical spin fluctuations near the AFM QCP competes with the field suppression effect on the AFM phase. We suggest that the appearance of a field-induced AFM phase is a generic feature of unconventional superconductors, which emerge near an AFM QCP, including CeCoIn${}_5$, CeRhIn${}_5$, and high-$T_{\mathrm{c}}$ cuprates.

arXiv comment5 pages including 3 figures (Supplemental Material: 16 pages including 6 figures). To appear in PRL

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Cited by in corpus (9)

• Quantum Oscillations of the Quasiparticle Lifetime in a Metal
• Theory of Difference Frequency Quantum Oscillations
• Quantum Oscillations and Magnetoresistance in Type-II Weyl Semimetals - Effect of a Field Induced Charge Density Wave
• Strange superconductivity near an antiferromagnetic heavy fermion quantum critical point
• Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5
• Tunable non-Lifshitz-Kosevich temperature dependence of Shubnikov-de Haas oscillation amplitudes in SmSb
• Ultralow temperature NMR of CeCoIn${}_5$
• Search for the field-induced magnetic instability around the upper critical field of superconductivity in H || c in CeCoIn5
• Navigating the trends in the proximity to magnetic quantum critical point and superconductivity for Ce-based heavy-fermion compounds