We present the results on heavily underdoped Y1−xCaxBa2Cu3O6+y, which provide the evidence that the doping mechanism (cation substitution or oxygen loading) directly determines whether the corresponding injected mobile holes contribute to superconductivity or only to high-temperature transport. We argue that this hole tagging is a signature of the complexities of single-hole doping in Mott insulators, and it calls for a subtler description of the correlated bands than the usual one. We also map in great detail the underdoped superconducting phase diagram Tc vs hole doping, which shows that the total number of mobile holes is not the driving parameter for superconductivity.
Experimental evidence of two distinct charge carriers in underdoped cuprate superconductors
SANNA, SAMUELE;
2008-01-01
Abstract
We present the results on heavily underdoped Y1−xCaxBa2Cu3O6+y, which provide the evidence that the doping mechanism (cation substitution or oxygen loading) directly determines whether the corresponding injected mobile holes contribute to superconductivity or only to high-temperature transport. We argue that this hole tagging is a signature of the complexities of single-hole doping in Mott insulators, and it calls for a subtler description of the correlated bands than the usual one. We also map in great detail the underdoped superconducting phase diagram Tc vs hole doping, which shows that the total number of mobile holes is not the driving parameter for superconductivity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
