Experimental evidence of two distinct charge carriers in underdoped cuprate superconductors

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Samuele Sanna,¹ Francesco Coneri,¹ Americo Rigoldi,^1,2 Giorgio Concas,² and Roberto De Renzi¹
¹Unità CNISM di Parma e Dipartimento di Fisica, I 43100 Parma, Italy
²Unità CNISM di Cagliari e Dipartimento di Fisica, I 09042 Monserrato (Ca), Italy

Received 7 May 2008; published 27 June 2008

Wepresent the results on heavily underdoped Y_1−xCa_xBa₂Cu₃O_6+y, which provide theevidence that the doping mechanism (cation substitution or oxygen loading)directly determines whether the corresponding injected mobile holes contribute tosuperconductivity or only to high-temperature transport. We argue that thishole tagging is a signature of the complexities of single-holedoping in Mott insulators, and it calls for a subtlerdescription of the correlated bands than the usual one. Wealso map in great detail the underdoped superconducting phase diagramT_c vs hole doping, which shows that the total numberof mobile holes is not the driving parameter for superconductivity.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.77.224511
DOI:	10.1103/PhysRevB.77.224511
PACS:	74.25.Fy; 74.72.-h; 71.30.+h; 76.75.+i 74.25.Fy Transport properties of superconductors 74.72.-h Cuprate superconductors 71.30.+h Metal-insulator transitions and other electronic transitions 76.75.+i Muon spin rotation and relaxation in condensed matter YEAR: 2008
KEYWORDS:	barium compounds, calcium compounds, charge injection, doping, high-temperature superconductors, hole mobility, ion exchange, localised states, phase diagrams, superconducting transition temperature, yttrium compounds

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