Incoherent inelastic neutron scattering study of the low-frequency phonons in superconducting La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/ and antiferromagnetic La/sub 2/CuO/sub 4/

Journal Article · Mon Feb 01 00:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.2231· OSTI ID:5741452

Rosseinsky, M J; Prassides, K; Day, P; Dianoux, A J

The generalized phonon density of states (DOS) has been measured for the ceramic superconductor La/sub 1.85/Sr/sub 0.15/CuO/sub 4/ (T/sub 0/ = 38 K) and antiferromagnetic (T/sub N/ = 250 K) La/sub 2/CuO/sub 4/ from 0.1--100 meV at temperatures between 250 and 30 K. For the superconductor the phonon spectrum, which was temperature independent over the whole range, contained major peaks at 11.5, 18.5, 23.8, 29.5, 38, 55.2, 78 meV while La/sub 2/CuO/sub 4/ had peaks at 12, 18.5 (24), 29.5, 39.8, 57.2, 80 meV. Increased scattering in the range 5--8 meV, the only feature in the DOS of La/sub 2/CuO/sub 4/ which had no analogue in the superconductor was most apparent at 250 K decreasing with temperature to become insignificant at 30 K.

• Research Organization: Oxford University, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1chemically bond3QR, United Kingdom
• OSTI ID: 5741452
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 37:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
PHONONS
LANTHANUM OXIDES
STRONTIUM OXIDES
ANTIFERROMAGNETIC MATERIALS
INELASTIC SCATTERING
LOW TEMPERATURE
NEUTRON DIFFRACTION
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
VERY LOW TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
LANTHANUM COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity