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New Low-Frequency Relaxation Process in La2CuO4+δ by Internal Friction Experiments |
| WANG Shi-Xing1;LIU Wei2;LIU Yun-Long1;ZHANG Li-De1 |
| 1Institute of Solid State Physics, Chinese Academy of Science, Hefei 230031
2Laboratory of Internal friction and Defects in Solid, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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WANG Shi-Xing, LIU Wei, LIU Yun-Long et al 2000 Chin. Phys. Lett. 17 282-284 |
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Abstract The low-frequency relaxation internal friction spectrum of La2CuO4+δhas been measured from -170 to 200°C in an automatic torsion apparatus at frequencies between 0.1 and 5.0Hz. Three new relaxation processes are found with maxima, which are attributed to thermally activated diffusive jumps of oxygen atoms or vacancies in the oxygen sublattice, according to various activation enthalpies of three experimental runs. It is shown that the content of oxygen defect have important influences on the physical properties of La2CuO4+δ.
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| Keywords:
62.40.+i
74.72.-h
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Published: 01 April 2000
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| PACS: |
62.40.+i
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(Anelasticity, internal friction, stress relaxation, and mechanical resonances)
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74.72.-h
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(Cuprate superconductors)
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