Density of States Information from Low Temperature Specific Heat Measurements
The calculation of one-electron density of state values from the coefficient γ of the term of the low temperature specific heat linear in temperature is complicated by many-body effects. In particular, the electron-phonon interaction may enhance the measured γ as much as twofold. The enhancement factor can be evaluated in the case of superconducting metals and alloys. In the presence of magnetic moments, additional complications arise. A magnetic contribution to the measured γ was identified in the case of dilute alloys and also of concentrated alloys where parasitic antiferromagnetism is superimposed on an over-all ferromagnetic order. No method has as yet been devised to evaluate this magnetic part of γ. The separation of the temperature-linear term of the specific heat may itself be complicated by the appearance of a specific heat anomaly due to magnetic clusters in superparamagnetic or weakly ferromagnetic alloys.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
1970 |
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| Erschienen: |
1970 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:74A |
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| Enthalten in: |
Journal of research of the National Bureau of Standards. Section A, Physics and chemistry - 74A(1970), 3 vom: 15. Mai, Seite 449-454 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Beck, Paul A [VerfasserIn] |
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| Links: |
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| Themen: |
Alloys |
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| Anmerkungen: |
Date Revised 28.09.2020 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.6028/jres.074A.035 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM311024688 |
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| 245 | 1 | 0 | |a Density of States Information from Low Temperature Specific Heat Measurements |
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| 500 | |a Date Revised 28.09.2020 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a The calculation of one-electron density of state values from the coefficient γ of the term of the low temperature specific heat linear in temperature is complicated by many-body effects. In particular, the electron-phonon interaction may enhance the measured γ as much as twofold. The enhancement factor can be evaluated in the case of superconducting metals and alloys. In the presence of magnetic moments, additional complications arise. A magnetic contribution to the measured γ was identified in the case of dilute alloys and also of concentrated alloys where parasitic antiferromagnetism is superimposed on an over-all ferromagnetic order. No method has as yet been devised to evaluate this magnetic part of γ. The separation of the temperature-linear term of the specific heat may itself be complicated by the appearance of a specific heat anomaly due to magnetic clusters in superparamagnetic or weakly ferromagnetic alloys | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Alloys | |
| 650 | 4 | |a density of states | |
| 650 | 4 | |a low temperature specific heat | |
| 650 | 4 | |a magnetic specific heat | |
| 650 | 4 | |a many-body effects | |
| 650 | 4 | |a superconductivity | |
| 700 | 1 | |a Claus, Helmut |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Journal of research of the National Bureau of Standards. Section A, Physics and chemistry |d 1959 |g 74A(1970), 3 vom: 15. Mai, Seite 449-454 |w (DE-627)NLM298323281 |x 0022-4332 |7 nnns |
| 773 | 1 | 8 | |g volume:74A |g year:1970 |g number:3 |g day:15 |g month:05 |g pages:449-454 |
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