Металл-диэлектрик переходы в легированных лантановых сверхпроводниках с примесями малого радиуса

Authors

Keywords: La-based cuprates, hole carriers, metal/superconductor-insulator transitions, lightly doped regime, overdoped regime, critical carrier concentration

Abstract

The purpose of this research is to determine the criteria (i.e. conditions) for the existence of the localized states of hole carriers and solve the problem of metal-insulator transitions in La-based cuprates. We propose a new two-carrier cuprate superconductor model for studying two distinct metal-insulator transitions occurring simultaneously in hole-doped La-based cuprate compounds. We demonstrate that when hole carriers reside in impurity and polaron bands, these metal-insulator transitions in La-based superconductors with small-radius dopants occur accordingly in a wide doping range and relatively lower doping levels.

References

1. Mott N. F. // Proc. Phys. Soc. London. 1949, Vol. A62. – P. 416-422.

2. Hubbard J. // Proc. Roy. Soc. London. 1964, Vol. A277, -P. 237-259; // Proc. Roy. Soc. London. 1964, Vol. A281. – P. 401-419.

3. Mott N. F. Metal-Insulator Transitions. Taylor and Francis, London, 1990. – Р. 286.

4. Lavrov A.N., Gantmakher V.F. // Phys. Usp. 1998, Vol.41. – Р. 223-226.

5. Abrikosov A.A. // Phys.Usp. 1998, Vol.41. – Р. 605-616.

6. Imada M., et.al.// Rev. Mod. Phys. 1998, Vol. 70. – Р. 1039-1263.

7. Walz F. // J. Phys.: Condens. Matter.2002, Vol.14. – Р. R285-R340.

8. Vedeneev S.I. // Usp. Fiz. Nauk, 2012, Vol.182. – Р.669-676.

9. Dzhumanov S. Theory of Conventional and Unconventional Superconductivity in the High-T Cuprates and Other c Systems. Nova Science Publishers. – New York: 2013. – Р. 356.

10. Dzhumanov S. et al. // Phys. Lett. A. 2019, Vol. 383. – P.1330-1335.

11. Damascelli A. et.al.// Rev. Mod. Phys. 2003, Vol.75. – Р. 473-541.

12. Dzhumanov S., et.al.// Superlattices and Microstructures, 2015, Vol.84. – Р. 66-71.

13. Toyozawa Y. // Physica B, 1983, Vol.116. – Р. 7-17.

14. Kastner M.A., et.al.// Rev. Mod. Phys.1998, Vol. 70. – Р. 897-928.

15. Dzhumanov S., et al. // J. Phys. Chem. Solids. 2012, Vol.73. – Р. 484- 494.

16. Ono S., et al. // Physica C. 2001, Vol.357-360. – Р. 138-141.

17. Anshukova N.V., et al. // Zh. Eksp. Teor. Fiz. 2003, Vol. 123. – Р. 1188-1199.

18. Sakita Sh., et al. // J. Phys. Soc. Jpn. 1999, Vol.68. – Р. 2755-2761.

19. Koike Y., et al. // Physica C. 2001, Vol. 357-360. – Р. 82-88.