Unconventional heavy-fermion superconductor CeCoIn5: dc magnetization study at temperatures down to 50 mK

T. Tayama; A. Harita; T. Sakakibara; Y. Haga; H. Shishido; R. Settai; Y. Onuki

doi:10.1103/PhysRevB.65.180504

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Unconventional heavy-fermion superconductor CeCoIn5: dc magnetization study at temperatures down to 50 mK

T. Tayama, A. Harita, T. Sakakibara, Y. Haga, H. Shishido, R. Settai, Y. Onuki

DOI 10.1103/PhysRevB.65.180504 · Physical Review B

T1

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Abstract

dc magnetization measurements on CeCoIn5 reveal a first-order phase transition at Hc2 for both H‖a and c axes in the isothermal magnetization M(H) below 0.7 K, indicating a strong Pauli paramagnetic suppression in the even-parity pairing. M(T) in the normal state above Hc2 exhibits non-Fermi-liquid behavior down to 150 mK, implying the existence of antiferromagnetic fluctuations behind the unconventional superconductivity. We observed an unusual peak effect for H‖c in fields 5–30 kOe below 150 mK(=0.06Tc), whose anomalous temperature dependence cannot be simply explained by ordinary mechanisms.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure unresolved	onset
CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown