Search for the field-induced magnetic instability around the upper critical field of superconductivity in H || c in CeCoIn5

Abstract

We present nuclear spin-lattice relaxation rate (1/T1) at the Co site and ac-susceptibility results in the normal and superconducting (SC) states of CeCoIn5 for H || c near the SC upper critical field Hc2 above 0.1 K. At 4.2 T, 1/T1 rapidly decreases below the SC transition temperature, consistent with the previous reports. Although the field dependence of 1/T1T at 0.1 K shows a peak at 5.2 T above Hc2, the temperature dependence of 1/T1T at 5.2 T is independent of temperature below 0.2 K, showing a Fermi-liquid behavior. In addition, we found no NMR-spectrum broadening by the appearance of internal fields around Hc2 at 0.1 K. We could not detect any field-induced magnetic instability around Hc2 down to 0.1 K although the remarkable non-Fermi-liquid behavior towards Hc2 was observed in various physical quantities.

arXiv comment6 pages, 3 figures

References in corpus (16)

• Superconductivity in Iron Compounds
• Quantum Criticality in Heavy Fermion Metals
• Heavy-fermion superconductivity in CeCoIn5 at 2.3K
• Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
• Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5
• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Imaging Cooper Pairing of Heavy Fermions in CeCoIn5
• Visualizing Nodal Heavy Fermion Superconductivity in CeCoIn5
• Microscopic evidence for field-induced magnetism in CeCoIn${}_5$
• Sign reversal of field-angle resolved heat capacity oscillations in a heavy fermion superconductor CeCoIn${}_5$ and $d_{x^2-y^2}$ pairing symmetry
• Anomalous NMR Magnetic Shifts in CeCoIn_5
• Field-Tuned Quantum Critical Point in CeCoIn${}_5$ Near the Superconducting Upper Critical Field
• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5
• Anomalous Superconducting Properties and Field Induced Magnetism in CeCoIn5
• Thermoelectric response near a quantum critical point: the case of CeCoIn5
• Anomalous change in the de Haas-van Alphen oscillations of CeCoIn${}_5$ at ultra-low temperatures

Cited by in corpus (2)

• Modulation vector of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 revealed by high-resolution magnetostriction measurements
• Ultralow temperature NMR of CeCoIn${}_5$