Abstract
We have observed the electron paramagnetic resonance (EPR) of Gd3+ in both polycrystalline and single-crystal samples of dilute Pt: Gd alloys. The polycrystalline samples display a single resonance line whose thermal broadening is concentration dependent. Fully resolved fine structure appropriate to Gd3+ in a cubic environment is obtained from the single-crystal samples. From these results a value for b40 of +86 G is deduced, a value some three times larger than that found to date in any other cubic pure metals. It is shown conclusively that the experimental spectra from the single-crystal samples consist of the resolved single-ion fine-structure spectrum and an additional "cluster" line with the same g value as the single-ion spectrum. For most directions in the {110} plane excellent agreement is obtained between the single-ion spectra and those simulated using the Barnes-Plefka motional-narrowing theory. The existence and behavior of the "cluster" line is qualitatively explained in terms of a cross-relaxation process. Finally it is shown that the excitation energy E for the process 4f74f8 as involved in EPR is not the same as measured by optical experiments such as x-ray photoemission spectroscopy. A theory which describes this is capable of explaining the experimental exchange and crystal-field parameters.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2175-2194 |
| Number of pages | 20 |
| Journal | Physical Review B |
| Volume | 22 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1980 |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Electron paramagnetic resonance of Gd3+ in platinum. / Hardiman, M.; Pellisson, J.; Barnes, Stewart; Bisson, P. E.; Peter, M.
In: Physical Review B, Vol. 22, No. 5, 1980, p. 2175-2194.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electron paramagnetic resonance of Gd3+ in platinum
AU - Hardiman, M.
AU - Pellisson, J.
AU - Barnes, Stewart
AU - Bisson, P. E.
AU - Peter, M.
PY - 1980
Y1 - 1980
N2 - We have observed the electron paramagnetic resonance (EPR) of Gd3+ in both polycrystalline and single-crystal samples of dilute Pt: Gd alloys. The polycrystalline samples display a single resonance line whose thermal broadening is concentration dependent. Fully resolved fine structure appropriate to Gd3+ in a cubic environment is obtained from the single-crystal samples. From these results a value for b40 of +86 G is deduced, a value some three times larger than that found to date in any other cubic pure metals. It is shown conclusively that the experimental spectra from the single-crystal samples consist of the resolved single-ion fine-structure spectrum and an additional "cluster" line with the same g value as the single-ion spectrum. For most directions in the {110} plane excellent agreement is obtained between the single-ion spectra and those simulated using the Barnes-Plefka motional-narrowing theory. The existence and behavior of the "cluster" line is qualitatively explained in terms of a cross-relaxation process. Finally it is shown that the excitation energy E for the process 4f74f8 as involved in EPR is not the same as measured by optical experiments such as x-ray photoemission spectroscopy. A theory which describes this is capable of explaining the experimental exchange and crystal-field parameters.
AB - We have observed the electron paramagnetic resonance (EPR) of Gd3+ in both polycrystalline and single-crystal samples of dilute Pt: Gd alloys. The polycrystalline samples display a single resonance line whose thermal broadening is concentration dependent. Fully resolved fine structure appropriate to Gd3+ in a cubic environment is obtained from the single-crystal samples. From these results a value for b40 of +86 G is deduced, a value some three times larger than that found to date in any other cubic pure metals. It is shown conclusively that the experimental spectra from the single-crystal samples consist of the resolved single-ion fine-structure spectrum and an additional "cluster" line with the same g value as the single-ion spectrum. For most directions in the {110} plane excellent agreement is obtained between the single-ion spectra and those simulated using the Barnes-Plefka motional-narrowing theory. The existence and behavior of the "cluster" line is qualitatively explained in terms of a cross-relaxation process. Finally it is shown that the excitation energy E for the process 4f74f8 as involved in EPR is not the same as measured by optical experiments such as x-ray photoemission spectroscopy. A theory which describes this is capable of explaining the experimental exchange and crystal-field parameters.
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U2 - 10.1103/PhysRevB.22.2175
DO - 10.1103/PhysRevB.22.2175
M3 - Article
AN - SCOPUS:34848863658
VL - 22
SP - 2175
EP - 2194
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 5
ER -