Superconducting-insulator transition driven by out-of-plane carrier localization in Nd1.2Ba1.8Cu3O7+x ultrathin films

@article{ ISI:000244532600089,
Author = {Salluzzo, M. and Ghiringhelli, G. and Brookes, N. B. and De Luca, G. M.
   and Fracassi, F. and Vaglio, R.},
Title = {{Superconducting-insulator transition driven by out-of-plane carrier
   localization in Nd1.2Ba1.8Cu3O7+x ultrathin films}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2007}},
Volume = {{75}},
Number = {{5}},
Month = {{FEB}},
Abstract = {{Polarized x-ray absorption spectroscopy (XAS) at the copper L-2,L-3 and
   oxygen K edges has been used to study the superconducting-insulating
   (S-I) transition in Nd1.2Ba1.8Cu3O7+x epitaxial films, realized by
   reducing the thickness from 9 to 6 unit cells. XAS shows that the main
   differences between the superconducting and the insulating films cannot
   be ascribed to changes of Cu density of states within the conducting
   CuO2 planes, but rather to the increase of the 3d(3z)(2)-r(2) states of
   copper and to the effective reduction of the charge transfer of holes to
   the oxygen 2p(xy) orbitals in the CuO2 planes. The experimental results
   show that the S-I transition is related to the hole localization at the
   Cu sites of the charge reservoir layer, i.e., outside the CuO2 planes,
   while the electronic states, lying within the conducting planes, appear
   to be similar in the insulating and superconducting states.}},
Publisher = {{AMERICAN PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Salluzzo, M (Corresponding Author), Univ Naples Federico II, CNR, INFM, COHERENTIA, Complesso Monte S Angelo,Via Cinthia, I-80126 Naples, Italy.
   Univ Naples Federico II, CNR, INFM, COHERENTIA, I-80126 Naples, Italy.
   Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy.
   Politecn Milan, CNR, INFM, COHERENTIA, I-20133 Milan, Italy.
   Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy.
   European Synchrotron Radiat Facil, F-38043 Grenoble, France.}},
DOI = {{10.1103/PhysRevB.75.054519}},
Article-Number = {{054519}},
ISSN = {{1098-0121}},
Keywords-Plus = {{X-RAY-ABSORPTION; CRITICAL-TEMPERATURE; APICAL OXYGEN; THIN-FILMS;
   LA2-XSRXCUO4; CRYSTALS; DISORDER}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories  = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
   Condensed Matter}},
ResearcherID-Numbers = {{Ghiringhelli, Giacomo/D-1159-2014
   salluzzo, marco/C-5919-2009
   Brookes, Nicholas B/C-6718-2019}},
ORCID-Numbers = {{Ghiringhelli, Giacomo/0000-0003-0867-7748
   salluzzo, marco/0000-0001-8372-6963
   Brookes, Nicholas B/0000-0002-1342-9530}},
Number-of-Cited-References = {{30}},
Times-Cited = {{9}},
Usage-Count-Last-180-days = {{1}},
Usage-Count-Since-2013 = {{7}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{140UQ}},
Unique-ID = {{ISI:000244532600089}},
DA = {{2020-12-22}},
}