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 · Sat Jul 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.1389· OSTI ID:76460

Vybornov, M ^[1]; Perthold, W; Michor, H; Holubar, T; Hilscher, G ^[2]; Rogl, P ^[1]; Fischer, P ^[3]; Divis, M ^[4]

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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)

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

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