Evolution from Magnetism to Unconventional Superconductivity in a Series of CexCu2Si2 Compounds Probed by Cu NQR
K. Ishida, Y. Kawasaki, K. Tabuchi, K. Kashima, Y. Kitaoka, K. Asayama, C. Geibel, F. Steglich
DOI 10.1103/PhysRevLett.82.5353 · Physical Review Letters
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Abstract
We report on the basis of Cu-NQR measurements that the ground state in a series of CexCu2Si2 compounds evolves from a magnetically ordered phase at x=0.975 to a heavy-electron superconducting (SC) phase at x=1.025. We have found that the sample of x=0.99 does not exhibit any trace of magnetic phase transition down to 0.012 K. Slow magnetic fluctuations with low frequencies comparable to the NQR frequency develop rapidly below Tm∼1.2K. This unusual “critical magnetic phase” can coexist with the SC phase. For the samples of x=1.00 and 1.025 such a state is expelled by the onset of the SC state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | Pressure not reported | unknown |
| Ce1.00Cu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | Pressure not reported | onset |
| Ce1.025Cu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | Pressure not reported | onset |
| Ce0.99Cu2.02Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | Pressure not reported | onset |
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