Low-temperature electronic properties of the La[sub n+1]Ni[sub n]O[sub 3n+1] (n = 2,3, and [infinity]) system: Evidence for a crossover from fluctuating-valence to Fermi-liquid-like behavior

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1161· OSTI ID:6621836

Sreedhar, K; Kim, D; Metcalf, P; Honig, J M; McElfresh, M; Perry, D ^[1]

---

1. Purdue Univ., West Lafayette, IN (United States)

Measurements of the temperature dependence of the electrical resistivity [rho](T), magnetic susceptibility [chi](T), and Seebeck coefficient S(T) have been carried out on the N = 2,3, and [infinity] members of the homologous lanthanum nickel oxide systems La[sub n+1]Ni[sub n]O[sub 3n+1] that were annealed in air. With increasing n, a progressive decrease in the electrical resistivity and a gradual change from insulating to metallic behavior are observed. La[sub 3]Ni[sub 2]O[sub 7] is nonmetallic, showing a gradual increase in [rho] and T decrease (d[rho]/dT < 0) from 300 to 4.2K, whereas La[sub 4]Ni[sub 3]O[sub 10] and LaNiO[sub 3] exhibit metallic resistivity (d[rho]/dT > 0). A minimum in [rho](T) near 140 K is observed for La[sub 4]Ni[sub 3]O[sub 10], while LaNiO[sub 3] exhibits a T[sup 2] dependence for [rho](T) below [approximately]50 K. The magnetic susceptibility of LaNiO[sub 3] is Pauli-like, but the [chi](T) data for La[sub 3]Ni[sub 2]O[sub 7] and La[sub 4]Ni[sub 3]O[sub 10] below 350 K show a decrease with decreasing temperature. The Seebeck coefficient of all these compounds is negative at high temperatures; La[sub 3]Ni[sub 2]O[sub 7] and La[sub 4]Ni[sub 3]O[sub 10] exhibit a sign change in S at low temperatures. These results suggest a crossover from a fluctuating-valence to a Fermi-liquid-like behavior with increasing n.

• OSTI ID: 6621836
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 110:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM OXIDES
ELECTRICAL PROPERTIES
NICKEL OXIDES
ELECTRIC CONDUCTIVITY
MAGNETIC SUSCEPTIBILITY
SEEBECK EFFECT
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
CHALCOGENIDES
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
&amp; Refractories- Physical Properties