Nuclear Ordering in Lithium and an Upper Limit on its Ambient Pressure Superconducting Transition Temperature
K. I. Juntunen, J. T. Tuoriniemi
DOI 10.1103/PhysRevLett.93.157201 · Physical Review Letters
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Abstract
We have discovered spontaneous ordering of nuclear spins in lithium metal by NMR measurements at very low temperatures. In low magnetic fields, B<0.2 mT, the NMR spectra show a pronounced low-frequency anomaly. Also, nonadiabatic response to a slowly varying magnetic field was observed. A rich phase diagram with three different nonparamagnetic regions is proposed. We estimate a critical spin temperature Tc≈350 nK at B=0. We also report the absence of superconductivity in lithium at normal pressure down to Te≈100 μK (B<10 nT).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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