Phonon density of states in [ital R][sub 2]CuO[sub 4] and superconducting [ital R][sub 1. 85]Ce[sub 0. 15]CuO[sub 4] ([ital R]=Nd,Pr)

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.473· OSTI ID:6489509

Sumarlin, I W; Lynn, J W ^[1]; Neumann, D A; Rush, J J ^[2]; Loong, C ^[3]; Peng, J L; Li, Z Y ^[4]

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1. Department of Physics, Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States) Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
3. Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
4. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

Inelastic-neutron-scattering measurements of the generalized phonon density of states (GDOS) for the electron-doped superconductors Nd[sub 1.85]Ce[sub 0.15]CuO[sub 4] and Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4] have been carried out with the use of both a filter-detector method and time-of-flight spectroscopy. A measurement of the GDOS for the insulating Pr[sub 2]CuO[sub 4] was also done for comparison with that of Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4], while a more limited set of data was obtained for Nd[sub 2]CuO[sub 4]. Comparison between the GDOS spectrum of the Nd[sub 1.85]Ce[sub 0.15]CuO[sub 4] with that of Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4] shows differences in the shape of some structures in the GDOS spectrum. Furthermore, there are substantial changes in the GDOS spectrum of Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4] as compared to that of Pr[sub 2]CuO[sub 4], particularly in the energy regime between 33 and 63 meV.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6489509
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:1; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BEAMS
CERIUM COMPOUNDS
CERIUM OXIDES
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COPPER COMPOUNDS
COPPER OXIDES
CUPRATES
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
INELASTIC SCATTERING
INTERACTIONS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NEUTRON BEAMS
NUCLEON BEAMS
OXIDES
OXYGEN COMPOUNDS
PAIRING INTERACTIONS
PARTICLE BEAMS
PHONONS
PRASEODYMIUM COMPOUNDS
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QUASI PARTICLES
RARE EARTH COMPOUNDS
SCATTERING
SUPERCONDUCTORS
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