Absence of superconductivity in (Pr[sub 1. 5]Ce[sub 0. 5)]Sr[sub 2]Cu[sub 2]NbO[sub 10]: A general correlation with magnetic ordering

Conference · Tue Dec 01 00:00:00 EST 1992

OSTI ID:6399360

Radousky, H B ^[1]; Goodwin, T J; Shelton, R N ^[2]

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1. Lawrence Livermore National Lab., CA (United States) California Univ., Davis, CA (United States). Dept. of Physics
2. California Univ., Davis, CA (United States). Dept. of Physics

(Pr[sub l.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10] is found to be an insulating analog to (Nd[sub l.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10], (Sm[sub 1.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10] and (Eu[sub l.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10] which have superconducting transition temperatures near 28 K. (Pr[sub l.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10] is also observed to display two magnetic ordering transitions, near 15 K and 50 K, which are not observed for the Nd, Sm or Eu based materials. This compound is a new example of the absence of superconductivity in a PrBa[sub 2]Cu[sub 3]O[sub 7] related structure which exhibits an unusually high magnetic ordering temperature relative to the other members of the rare earth series. An argument is made for a general correlation between the absence of superconductivity and the presence of magnetic ordering in these structures. The observation of this correlation in the (R[sub 1.5]Ce[sub 0.5])Sr[sub 2]Cu[sub 2]NbO[sub 10] system is compared to similar observations in RBa[sub 2]Cu[sub 3]O[sub 7] and RBa[sub 2]Cu[sub 2]NbO[sub 8]. The physical basis for the general nature of this correlation is discussed in terms of f electron hybridization and the unusual crystal field splitting observed for the Pr ion in the YBCO structure.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF); USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6399360
• Report Number(s): UCRL-JC-111437; CONF-930107-2; ON: DE93012579; CNN: DMR-90-21029
• Resource Relation: Conference: 2. Israeli international conference on high T/sub c/ superconductivity, Elat (Israel), 4-7 Jan 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
MAGNETIC PROPERTIES
COPPER COMPOUNDS
NIOBATES
PRASEODYMIUM COMPOUNDS
STRONTIUM COMPOUNDS
CORRELATIONS
CRYSTAL FIELD
ELECTRONIC STRUCTURE
MAGNETIZATION
NEEL TEMPERATURE
PHASE TRANSFORMATIONS
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360204* - Ceramics
Cermets
& Refractories- Physical Properties