Infrared study of the low-temperature-othorhombic--low-temperature-tetragonal structural phase transition in La sub 2 NiO sub 4

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.8787· OSTI ID:6173412

Rice, D E ^[1]; Crawford, M K ^[2]; Buttrey, D J ^[1]; Farneth, W E ^[3]

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1. Department of Chemical Engineering, University of Delaware, Newark, DE (USA)
2. Central Research and Development Department, E. I. du Pont de Nemours Co., Experimental Station, Wilmington, DE (USA)
3. Central Research and Development Department,E. I. du Pont de Nemours Co., Experimental Station, Wilmington, DE (USA)

We have studied the polarized infrared reflectance of a stoichiometric single crystal of La{sub 2}NiO{sub 4} through the {ital Abma} ({ital D}{sub 2{ital h}}{sup 18}) (low-temperature orthorhombic) {r arrow}{ital P}4{sub 2}/{ital ncm} ({ital D}{sub 4{ital h}}{sup 16}) (low-temperature tetragonal) structural phase transition. This transition, which occurs near 70 K, involves a rigid tilt of the Ni-O{sub 6} octahedra and produces distinct changes in the infrared-active phonons. Our observations are consistent with a first-order phase transition. This phase transition also occurs in La{sub 1.88}Ba{sub 0.12}CuO{sub 4}, and has a profound influence on superconductivity in that material.

• OSTI ID: 6173412
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
ELECTROMAGNETIC RADIATION
INFRARED RADIATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MINERALS
MONOCRYSTALS
NICKEL COMPOUNDS
NICKEL OXIDES
ORTHORHOMBIC LATTICES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE TRANSFORMATIONS
RADIATIONS
RARE EARTH COMPOUNDS
TETRAGONAL LATTICES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS