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 00:00:00 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]

---

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, Vol. 52, Issue 2; Other Information: PBD: 1 Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

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