Superconducting energy gap and antiferromagnetic spin fluctuations in the superconductor YNi2B2C: An NMR study
T. Kohara, T. Oda, K. Ueda, Y. Yamada, A. Mahajan, K. Elankumaran, Zakir Hossian, L. C. Gupta, R. Nagarajan, R. Vijayaraghavan, Chandan Mazumdar
DOI 10.1103/PhysRevB.51.3985 · Physical Review B
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Abstract
Pulsed NMR studies of B11 and Y89 have been carried out in the recently discovered quaternary borocarbide superconductor YNi2B2C (Tc=15.5 K). These results are as follows: (a) Superconducting state: Though there is only one crystallographic B site in this structure, we have observed two B11 resonances in the superconducting state. One signal comes from a superconducting region, and the other from a normal-metal region. As for the former signal, the nuclear relaxation rate, T1−1 decreases drastically with further decrease of temperature with no appreciable enhancement just below Tc, and it starts to saturate below 6 K. (b) Normal state: (T1T)−1 increases as temperature decreases. We interpret this temperature dependence as arising due to two-dimensional or three-dimensional antiferromagnetic spin fluctuations (structure of YNi2B2C is tetragonal and highly anisotropic).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure not reported | onset |
| YPd5B3Cx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| YPd4BCO2.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.5 | Pressure not reported | unknown |
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