A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound
Апстракт
The 60 K plateau of the YBa2Cu3O6+x high-T-c superconducting compound has traditionally been known as a horizontal section in its T-c(x) characteristics within which the critical temperature maintains at a constant level T-c approximate to 60 K. However, recent experiments on a series of high quality single crystals samples of the YBa2Cu3O6+x compound (produced by improved techniques of sample preparation) have shown the 60 K plateau does not manifest itself anymore as a horizontal section of the T-c(x), but emerges as a section over which T-c(x) keeps on continuously rising (the quasi 60 K plateau). Here we propose a theoretical model that explains how the classical (horizontal) 60 K plateau naturally evolves into the quasi 60 K plateau, due to the improved orthorhombicity in the high quality single crystal material accompanied by longer CuO chains. The model assumes that short CuO chains do not contribute to the hole transfer from chains to CuO2 layers, but only chains whose length i...s greater than, or equal to, a certain threshold length l(cr). Our calculations point to a conclusion that this minimal number of oxygen atoms in a CuO chain, that is required to trigger the hole transfer, is equal to four. The calculated values for T-c(x) are in a very good correlation with the corresponding experimentally obtained results. (C) 2012 Elsevier B. V. All rights reserved.
Кључне речи:
High-T-c superconductors / Order-disorder effects / Phase diagramsИзвор:
Journal of Alloys and Compounds, 2013, 551, 189-194Финансирање / пројекти:
- Суперпроводност, магнетизам и флуктуационе појаве (RS-MESTD-Basic Research (BR or ON)-171027)
DOI: 10.1016/j.jallcom.2012.10.047
ISSN: 0925-8388
WoS: 000313651600033
Scopus: 2-s2.0-84869884582
Колекције
Институција/група
VinčaTY - JOUR AU - Matić, Vladimir M. AU - Lazarov, Nenad Đ. AU - Milić, Mirjana M. PY - 2013 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5270 AB - The 60 K plateau of the YBa2Cu3O6+x high-T-c superconducting compound has traditionally been known as a horizontal section in its T-c(x) characteristics within which the critical temperature maintains at a constant level T-c approximate to 60 K. However, recent experiments on a series of high quality single crystals samples of the YBa2Cu3O6+x compound (produced by improved techniques of sample preparation) have shown the 60 K plateau does not manifest itself anymore as a horizontal section of the T-c(x), but emerges as a section over which T-c(x) keeps on continuously rising (the quasi 60 K plateau). Here we propose a theoretical model that explains how the classical (horizontal) 60 K plateau naturally evolves into the quasi 60 K plateau, due to the improved orthorhombicity in the high quality single crystal material accompanied by longer CuO chains. The model assumes that short CuO chains do not contribute to the hole transfer from chains to CuO2 layers, but only chains whose length is greater than, or equal to, a certain threshold length l(cr). Our calculations point to a conclusion that this minimal number of oxygen atoms in a CuO chain, that is required to trigger the hole transfer, is equal to four. The calculated values for T-c(x) are in a very good correlation with the corresponding experimentally obtained results. (C) 2012 Elsevier B. V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound VL - 551 SP - 189 EP - 194 DO - 10.1016/j.jallcom.2012.10.047 ER -
@article{ author = "Matić, Vladimir M. and Lazarov, Nenad Đ. and Milić, Mirjana M.", year = "2013", abstract = "The 60 K plateau of the YBa2Cu3O6+x high-T-c superconducting compound has traditionally been known as a horizontal section in its T-c(x) characteristics within which the critical temperature maintains at a constant level T-c approximate to 60 K. However, recent experiments on a series of high quality single crystals samples of the YBa2Cu3O6+x compound (produced by improved techniques of sample preparation) have shown the 60 K plateau does not manifest itself anymore as a horizontal section of the T-c(x), but emerges as a section over which T-c(x) keeps on continuously rising (the quasi 60 K plateau). Here we propose a theoretical model that explains how the classical (horizontal) 60 K plateau naturally evolves into the quasi 60 K plateau, due to the improved orthorhombicity in the high quality single crystal material accompanied by longer CuO chains. The model assumes that short CuO chains do not contribute to the hole transfer from chains to CuO2 layers, but only chains whose length is greater than, or equal to, a certain threshold length l(cr). Our calculations point to a conclusion that this minimal number of oxygen atoms in a CuO chain, that is required to trigger the hole transfer, is equal to four. The calculated values for T-c(x) are in a very good correlation with the corresponding experimentally obtained results. (C) 2012 Elsevier B. V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound", volume = "551", pages = "189-194", doi = "10.1016/j.jallcom.2012.10.047" }
Matić, V. M., Lazarov, N. Đ.,& Milić, M. M.. (2013). A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound. in Journal of Alloys and Compounds, 551, 189-194. https://doi.org/10.1016/j.jallcom.2012.10.047
Matić VM, Lazarov NĐ, Milić MM. A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound. in Journal of Alloys and Compounds. 2013;551:189-194. doi:10.1016/j.jallcom.2012.10.047 .
Matić, Vladimir M., Lazarov, Nenad Đ., Milić, Mirjana M., "A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound" in Journal of Alloys and Compounds, 551 (2013):189-194, https://doi.org/10.1016/j.jallcom.2012.10.047 . .