Fluctuations above Tc and the kinetic energy of Cooper pairs in La1.9Sr0.1CuO4 and Pb0.55In0.45
Mauro M. Doria, S. Salem-Sugui, Jr.
DOI 10.1103/PhysRevB.78.134527 · Physical Review B
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Abstract
The kinetic energy of the superconducting state of Pb-In and La-SrCuO is shown to be quite distinct although both compounds are known to present magnetic fluctuations in a wide temperature range above Tc. While Pb-In isofield kinetic-energy curves cross each other, and show a predominant mean-field behavior, as observed in the magnetization, similar curves for La-SrCuO do not cross each other, just being continuously dislocated to the high-temperature direction, smoothly extending above Tc. We show that the La-SrCuO isofield kinetic curves obey scaling near the transition and this can be viewed either as the existence of thermal fluctuations or as a sign of a new temperature scale Te.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.9Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
| Pb0.55In0.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.43 | Pressure not reported | unknown |
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