NMR study of electric quadrupole interactions in GdCo2
Creators
- 1. Espirito Santo Univ., Vitoria (Brazil). Dept. de Fisica e Quimica
- 2. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro
Description
Quadrupole oscillations have been observed with 59Co pulsed NMR in the intermetallic compound GdCo2. From theses oscillations the nuclear electric quadrupoles interaction (EQI) has been studied as a function of temperature in the range 4K-312K. The value measured at 4K, ν sub(Q)=672 +-3 KHz, is the largest so far reported for the cobalt EQI in the RCo2 intermetallics. The EQI decreases with increasing temperature, reaching 432 +- 10 KHz at 312K. The amplitude of the oscillations tends to decrease with temperature, being also dependent on the easy direction of magnetization of the compound. Thus, above 200K, as the direction of magnetization changes, large oscillations are again visible in the satellite line; the main line shows no oscillations in this range. The observed temperature dependence of the EQI is roughly linear, as found in other transition metal systems. (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Observam-se oscilacoes de quadrupolo com RMN pulsada de 59Co no composto intermetalico GdCo2. A partir dessas oscilacoes estuda-se a interacao de quadrupolo eletrico nuclear (IQE) como uma funcao da temperatura no intervalo de 4K-312K. O valor medido a 4K, ν sub(Q) =672 +- 3KHz, e o maior ate aqui divulgado para o IQE do cobalto nos intermetalicos RCo2. A IQE diminui com o aumento da temperatura, alcancando 432 +- 10 KHz a 312K. A amplitude das oscilacoes tende a decrescer com a temperatura, sendo tambem dependente da direcao de facil magnetizacao do composto. Assim, acima de 200K, com a direcao de magnetizacao troca, grandes oscilacoes sao novamente visiveis na linha do satelite; a linha principal nao mostra oscilacoes nessa faixa. A dependencia com a temperatura observada da IQE e aproximadamente linear, como encontrada em outros sistemas de metais de transicao. (L.C.)Files
16078956.pdf
Files
(201.6 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:6eb8f8f2181f16dfe453d62a7632431f
|
201.6 kB | Preview Download |
Additional details
Publishing Information
- Imprint Pagination
- 14 p.
- Report number
- CBPF-NF--019/84
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 16078956
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- COBALT COMPOUNDS; ELECTRIC FIELDS; EXPERIMENTAL DATA; GADOLINIUM COMPOUNDS; INTERMETALLIC COMPOUNDS; KHZ RANGE 100-1000; MAGNETIZATION; MEDIUM TEMPERATURE; NUCLEAR MAGNETIC RESONANCE; QUADRUPOLES; SPIN; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE
- Descriptors DEC
- ALLOYS; ANGULAR MOMENTUM; DATA; FREQUENCY RANGE; INFORMATION; KHZ RANGE; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETIC RESONANCE; MULTIPOLES; NUMERICAL DATA; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; RESONANCE; TRANSITION ELEMENT COMPOUNDS