Assertion: metal's oxidation state | /r/HasSubevent | superconducting behavior
Facets:
value: somehow
type: MANNER
Source sentences:
text: The reason for this is still not clear, but it is known that the vacancies occur only in certain places in the crystal, the copper oxide planes, and chains, giving rise to a peculiar oxidation state of the copper atoms, which somehow leads to the superconducting behavior.