Journal of Low Temperature Physics

, Volume 180, Issue 3–4, pp 277–283 | Cite as

Effect of Structural Relaxation on the Metal–Insulator Transition in Heavily Underdoped YBa\(_2\)Cu\(_3\)O\(_{7-\delta }\) Single Crystals

  • R. V. Vovk
  • O. V. Dobrovolskiy
  • Z. F. Nazyrov
  • K. A. Kotvitskaya
  • A. Chroneos


We report the results of a study of the effect of structural relaxation on the basal-plane conductivity of heavily underdoped high-\(T_\mathrm{{c}}\) YBa\(_2\)Cu\(_3\)O\(_{7-\delta }\) single crystals. An increase of the oxygen deficiency in YBa\(_2\)Cu\(_3\)O\(_{7-\delta }\) has been found to strengthen localization effects and to lead to the realization of a transition of the metal–insulator type, which always precedes the superconducting transition. In addition, a 5-day room-temperature annealing of the samples has been revealed to result in a notable shift of the metal–insulator transition point toward higher temperatures.


Superconducting cuprates Metal–insulator transition Annealing 


Conflict of interest

The authors declare no potential conflicts of interest.

Ethical standards   The research leading to these results did not involve Human Participants and/or Animals.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.V. Karazin National UniversityKharkivUkraine
  2. 2.Goethe UniversityFrankfurt am MainGermany
  3. 3.Faculty of Engineering and ComputingCoventry UniversityCoventryUK

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