Low-temperature anomalies in thermal expansion of HTSCs: System Bi2Sr2−x
LaxCuO6 |
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| Authors: | N V Anshukova A I Golovashkin L I Ivanova A P Rusakov I B Krynetskiĭ |
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| Institution: | (1) Lebedev Physical Institute, Russian Academy of Sciences, Leninskiĭ pr. 53, Moscow, 119991, Russia;(2) Moscow Institute of Steel and Alloys, Leninskiĭ pr. 4, Moscow, 117936, Russia;(3) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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| Abstract: | The data on thermal expansion at low temperatures have been obtained for HTSC single crystals of the system Bi2Sr2?x LaxCuO6 with different doping levels. Anomalous (negative) thermal expansion is observed in the temperature range from 5 to 20 K. It is shown that the anomaly vanishes in an overdoped sample. An anomalously strong effect of magnetic fields of 2–4 T on the negative thermal expansion domain is observed. The effect of field screening, frozen field, doping level, defects and oxygen vacancies on the region of thermal expansion anomalies is investigated. The origin of the observed anomalies in the properties of the system Bi2Sr2?x LaxCuO6, as well as other HTSC systems in which similar anomalies have been observed, is discussed. |
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