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Title: Transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition

Abstract

We have studied the transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition, focusing on Ca substitution levels [ital x][ge]0.3 for which the bulk material is metastable. Films with 0.4[le][ital x][le]0.5 exhibit a superconducting transition due to divalent cation doping on the rare-earth site. Pr[sub 0.5]Ca[sub 0.5]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] epitaxial thin films exhibit a superconducting onset temperature as high as 47 K with [ital T][sub [ital c]]([ital R]=0)=35 K. X-ray-diffraction and electrical-transport data suggest that Ca doping levels greater than [ital x]=0.5 are possible, although disorder is introduced as the divalent to trivalent cation ratio becomes large. This work demonstrates that 1:2:3-phase superconductivity can be achieved by substituting Ca for Pr, without the presence in the alloy of Y or any other rare-earth element, [ital R], for which [ital R]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] is superconducting. This result supports the view that hole localization, due to hybridization of the Pr 4[ital f] electronic levels with the O 2[ital p] orbitals, contributes substantially to the suppression of superconductivity by Pr in PrBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]], and demonstrates that this suppression can be partially compensated by appropriate hole doping with Ca.

Authors:
; ; ; ; ;  [1]
  1. Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6056 (United States)
Publication Date:
OSTI Identifier:
5291734
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (United States)
Additional Journal Information:
Journal Volume: 49:6; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; ELECTRIC CONDUCTIVITY; CALCIUM OXIDES; COPPER; PRASEODYMIUM OXIDES; ABLATION; CRYSTAL STRUCTURE; ELECTRONIC STRUCTURE; HIGH-TC SUPERCONDUCTORS; LASER RADIATION; SUPERCONDUCTING FILMS; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; ELECTRICAL PROPERTIES; ELECTROMAGNETIC RADIATION; ELEMENTS; FILMS; METALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PRASEODYMIUM COMPOUNDS; RADIATIONS; RARE EARTH COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENTS; 360207* - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-); 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Norton, D P, Lowndes, D H, Sales, B C, Budai, J D, Jones, E C, and Chakoumakos, B C. Transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition. United States: N. p., 1994. Web. doi:10.1103/PhysRevB.49.4182.
Norton, D P, Lowndes, D H, Sales, B C, Budai, J D, Jones, E C, & Chakoumakos, B C. Transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition. United States. doi:10.1103/PhysRevB.49.4182.
Norton, D P, Lowndes, D H, Sales, B C, Budai, J D, Jones, E C, and Chakoumakos, B C. Tue . "Transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition". United States. doi:10.1103/PhysRevB.49.4182.
@article{osti_5291734,
title = {Transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition},
author = {Norton, D P and Lowndes, D H and Sales, B C and Budai, J D and Jones, E C and Chakoumakos, B C},
abstractNote = {We have studied the transport and structural properties of Pr[sub 1[minus][ital x]]Ca[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films grown by pulsed-laser deposition, focusing on Ca substitution levels [ital x][ge]0.3 for which the bulk material is metastable. Films with 0.4[le][ital x][le]0.5 exhibit a superconducting transition due to divalent cation doping on the rare-earth site. Pr[sub 0.5]Ca[sub 0.5]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] epitaxial thin films exhibit a superconducting onset temperature as high as 47 K with [ital T][sub [ital c]]([ital R]=0)=35 K. X-ray-diffraction and electrical-transport data suggest that Ca doping levels greater than [ital x]=0.5 are possible, although disorder is introduced as the divalent to trivalent cation ratio becomes large. This work demonstrates that 1:2:3-phase superconductivity can be achieved by substituting Ca for Pr, without the presence in the alloy of Y or any other rare-earth element, [ital R], for which [ital R]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] is superconducting. This result supports the view that hole localization, due to hybridization of the Pr 4[ital f] electronic levels with the O 2[ital p] orbitals, contributes substantially to the suppression of superconductivity by Pr in PrBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]], and demonstrates that this suppression can be partially compensated by appropriate hole doping with Ca.},
doi = {10.1103/PhysRevB.49.4182},
journal = {Physical Review, B: Condensed Matter; (United States)},
issn = {0163-1829},
number = ,
volume = 49:6,
place = {United States},
year = {1994},
month = {2}
}