Coupling between the heavy-fermion superconductor CeCoIn5 and the antiferromagnetic metal CeIn3 through the atomic interface
M. Naritsuka, S. Nakamura, Y. Kasahara, T. Terashima, R. Peters, Y. Matsuda
DOI 10.1103/PhysRevB.100.024507 · Physical Review B
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Abstract
To study the mutual interaction between unconventional superconductivity and magnetic order through an interface, we fabricate hybrid Kondo superlattices consisting of alternating layers of the heavy-fermion superconductor CeCoIn5 and the antiferromagnetic (AFM) heavy-fermion metal CeIn3. The strength of the AFM fluctuations is tuned by applying hydrostatic pressure to the CeCoIn5(m)/CeIn3(n) superlattices with m and n unit-cell-thick layers of CeCoIn5 and CeIn3, respectively. The superconductivity in CeCoIn5 and the AFM order in CeIn3 coexist in spatially separated layers in the whole thickness and pressure ranges. At ambient pressure, the Néel temperature TN of the CeIn3 block layers (BLs) of CeCoIn5(7)/CeIn3(n) shows little dependence on the thickness n, in sharp contrast to CeIn3(n)/LaIn3(4) superlattices, where TN is strongly suppressed with decreasing n. This suggests that each CeIn3 BL is magnetically coupled by the Ruderman-Kittel-Kasuya-Yosida interaction through the adjacent CeCoIn5 BL and a three-dimensional magnetic state is formed. With applying pressure to CeCoIn5(7)/CeIn3(13), TN of the CeIn3 BLs is suppressed up to 2.4 GPa, showing a similar pressure dependence to that of bulk CeIn3 single crystals. An analysis of the upper critical field reveals that the superconductivity in the CeCoIn5 BLs is barely influenced by the AFM fluctuations in the CeIn3 BLs, even when the CeIn3 BLs are in the vicinity of the AFM quantum critical point. This is in stark contrast to CeCoIn5/CeRhIn5 superlattices, in which the superconductivity in the CeCoIn5 BLs is profoundly affected by AFM fluctuations in the CeRhIn5 BLs. The present results show that although AFM fluctuations are injected into the CeCoIn5 BLs from the CeIn3 BLs through the interface, they barely affect the force that binds superconducting electron pairs. These results demonstrate that two-dimensional AFM fluctuations are essentially important for the pairing interactions in CeCoIn5.
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. | 1.5 | Pressure not reported | onset |
| CeIn3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.2 | 2.6 GPa | unknown |
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