Elastic constants and observation of significant elastic softening in superconducting Bi2Sr2CaCu2O8 single crystals
Jin Wu, Yening Wang, Pingsheng Guo, Huimin Shen, Yifeng Yan, Zhongxian Zhao
DOI 10.1103/PhysRevB.47.2806 · Physical Review B
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Abstract
The complete temperature-dependent elastic constants of superconducting crystals Bi2Sr2CaCu2O8 (Tc=84 K) are determined from sound-velocity data. The longitudinal modes C11, C22, and CL (propagating along the [110] direction) monotonically increase as temperature decreases from room temperature to Tc. The shear-mode elastic constants C66 exhibit a weak variation (<1%) with temperature from 250 to 80 K except for three small softening minima around 240, 140, and 100 K. The in-plane shear mode C’(=[(C11+C22)/2-C12]/2) shows not only a relatively small absolute value, but also an overall trend of softening (11%) over a wide temperature range (200–100 K). The softening of the C’ mode is consistent with the local-atomic-displacements model proposed from pulsed-neutron-scattering results. A possible relation between the softening of elastic constants and superconductivity is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | zero_resistance |
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