Electron paramagnetic resonance of Ce sup 3+ in La(CF sub 3 SO sub 3 ) sub 3 ter dot 9H sub 2 O (US)

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.350073· OSTI ID:5096419

Petasis, D T; Bellesis, G H; VanderVen, N S; Friedberg, S A ^[1]

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1. Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania (USA)

The rare-earth trifluoromethanesulfonates {ital R}(CF{sub 3}SO{sub 3}){sub 3}{center dot}9H{sub 2}O ({ital R}TFMS) have a hexagonal structure similar to the ethylsulfates {ital R}(C{sub 2}H{sub 5}SO{sub 4}){sub 3}{center dot}9H{sub 2}O ({ital R}ES). The lowest Kramers doublet in CeTFMS is {vert bar}{ital J}=5/2; {ital J}{sub {ital z}} = {plus minus}5/2{r angle} separated from an excited doublet {vert bar}{ital J}=5/2; {ital J}{sub {ital z}}= {plus minus}1/2{r angle} by {Delta}/{ital k}{congruent}21 K. We have measured electron paramagnetic resonance on 1% and 2% Ce{sup 3+} in LaTFMS crystals at 9.214 GHz. At 4.2 K, absorption by two doublets is found yielding {ital g}{sub {parallel}}(5/2) = 3.813 {plus minus} 0.001; {ital g}{sub {perpendicular}}(5/2) = 0.262 {plus minus} 0.002; {ital g}{sub {parallel}}(1/2) = 0.977 {plus minus} 0.003; {ital g}{sub {perpendicular}}(1/2) = 2.151 {plus minus} 0.002. The temperature variation of intensities shows the ground doublet to be {vert bar}{plus minus}5/2{r angle}, as in concentrated CeTFMS, but {Delta}/{ital k}=9.6{plus minus}0.7 K. The doublet order is opposite to that for dilute Ce:LaES but the same as in CeES or Ce:YES and Ce:EuES. In 2% Ce:LaTFMS, satellite resonances due to coupled {ital nn} Ce--Ce pairs are also observed. Analysis of the pair data indicates that virtual phonon exchange, while the dominant nondipolar contribution to intrapair coupling, is smaller than for Ce pairs in CeES. This is consistent with the fact that {Delta} is larger in CeTFMS or Ce:LaTFMS than in CeES.

• OSTI ID: 5096419
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CERIUM IONS
CHARGED PARTICLES
CRYSTAL FIELD
ELECTRON SPIN RESONANCE
IONS
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RARE EARTH COMPOUNDS
RESONANCE