Anisotropic low-temperature heat transport in YBa2Cu3O6.9 single crystal

C. D. Bredl, K. Petersen, S. Arnold, G. Sparn, F. Steglich, S. Takahashi, M. Tachiki, B. Runtsch, T. Wolf

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We report measurements of the low-temperature thermal conductivity of YBa2Cu3O7-δ (δ≃0.1) single crystals (Tc=84 K) both parallel (κa, b) and perpendicular (κc) to the CuO2 planes. Whereas κc (T) is found to be identical, within experimental resolution, with the phonon contribution κph (T), κa, b (T) contains an additional term linear in temperature, AT. We ascribe AT to the contribution of unpaired electronic carriers residing in the "chain layers". Measurements performed in external magnetic fields B≦8 T support this interpretation. Our observations can be explained by an "internal multilayer" (IML) model in which it is assumed that strong superconductivity is generated within the CuO2 layers and weak superconductivity is induced in the "chain layers" by the proximity effect. The fit of the experimental results to the IML model reveals that approximately 15% of the electronic carriers remain unpaired in YBa2Cu3O7 below T=1 K.

Original languageEnglish
Pages (from-to)187-191
Number of pages5
JournalZeitschrift für Physik B Condensed Matter
Issue number2
Publication statusPublished - 1992 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


Dive into the research topics of 'Anisotropic low-temperature heat transport in YBa2Cu3O6.9 single crystal'. Together they form a unique fingerprint.

Cite this