Influence of the doping concentration of Y[sub 1-y]Ca[sub y]Ba[sub 2]Cu[sub 3]O[sub 7-δ] drain-source channels on the properties of superconducting field-effect devices

Logvenov, G.Yu.; Sawa, A.; Schneider, C.W.; Mannhart, J.
October 2003
Applied Physics Letters;10/27/2003, Vol. 83 Issue 17, p3528
Academic Journal
Systematic electric-field-effect studies of the charge transport in doped YBa[sub 2]Cu[sub 3]O[sub 7-δ] films were conducted. For overdoped drain-source channels, the normal-state resistance and the critical temperature T[sub c] decrease with electric-field-induced enhancements of the hole concentration n. For underdoped channels, the resistance decreases, but T[sub c] increases with n. For chemically optimally doped channels, the resistance decreases with n, however, T[sub c] shifts are less pronounced compared with underdoped and overdoped films. The results verify that the superconducting properties of YBa[sub 2]Cu[sub 3]O[sub 7-δ] can be controlled by electric fields, as predicted by the generic phase diagram of the cuprates. © 2003 American Institute of Physics.


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