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Synthesis and characterization of compounds Sr{sub 2}{ital RM}Cu{sub 2}O{sub 8{minus}{delta}} ({ital R}=Pr, Nd, Sm, Eu, Gd; {ital M}=Nb, Ta)

Journal Article · · Physical Review, B: Condensed Matter
 [1]; ; ; ;  [2];  [1];  [3];  [4]
  1. Institut fuer Physikalische Chemie, Universitaet Wien, Waehringerstrasse 42, A-1090 Wien (Austria)
  2. Institut fuer Experimentalphysik, T. U. Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien (Austria)
  3. Laboratorium fuer Neutronenstreuung, ETH Zuerich und Paul Scherrer Institut, CH-5232, Villigen PSI (Switzerland)
  4. Department of Metal Physics, Charles University, CZ 121 16 Praha 2 (Czech Republic)
+ Show Author Affiliations

Although traces of superconductivity ({lt}0.2%) have been detected in Ba{sub 2}La{ital M}{sub 1{minus}{ital x}}W{sub {ital x}}Cu{sub 2}O{sub 8{minus}{delta}} ({ital x}{similar_to}0.3,{ital M}=Nb,Ta) below 30 K, the superconducting impurity phase could not be resolved. The antiferromagnetic (AF) order of the rare-earth sublattice in this {ital R}-2112 system (e.g., {ital T}{sub {ital N}}{sup Gd}=2.18 K) appears to be similar to that of the {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} series (e.g., {ital T}{sub {ital N}}{sup Gd}=2.29 K); however, the exceptional high AF order of Pr in Pr-123 (with 17 K) is reduced to below 2.3 K for Sr{sub 2}Pr{ital M} Cu{sub 2}O{sub 8{minus}{delta}}. The temperature and field dependence of the specific heat and the susceptibility is discussed in terms of crystal field splitting derived from the {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compounds. Overall crystal field splitting in the title compounds is comparable with that of the {ital R}-123 compounds.

OSTI ID:
76460
Journal Information:
Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
COPPER OXIDES
CRYSTAL FIELD
CRYSTAL STRUCTURE
EUROPIUM OXIDES
GADOLINIUM OXIDES
HIGH-TC SUPERCONDUCTORS
MAGNETIC SUSCEPTIBILITY
NEODYMIUM OXIDES
NIOBIUM OXIDES
PRASEODYMIUM OXIDES
SAMARIUM OXIDES
SPECIFIC HEAT
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
TANTALUM OXIDES
TEMPERATURE DEPENDENCE