HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION
A practical method of nuclear spin cooling in the mK region, based on dramatic reduction in the spin-lattice relaxation time T1 at the antiferromagnetic-spin flop and spin flopparamagnetic phase transitions, is described. Far lower temperatures (down to 13 mK) than have been obtained to date (∼ 90 m...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Baltzer Science Publishers, Baarn/Kluwer Academic Publishers
1983
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| _version_ | 1797079870577049600 |
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| author | Dearaujo, M Bowden, G Clark, R Stone, N |
| author_facet | Dearaujo, M Bowden, G Clark, R Stone, N |
| author_sort | Dearaujo, M |
| collection | OXFORD |
| description | A practical method of nuclear spin cooling in the mK region, based on dramatic reduction in the spin-lattice relaxation time T1 at the antiferromagnetic-spin flop and spin flopparamagnetic phase transitions, is described. Far lower temperatures (down to 13 mK) than have been obtained to date (∼ 90 mK) are achieved in reasonable times, greatly increasing the sensitivity of NMRON. Following resonance, active isotope spins can be rapidly reset (in times ∼ 1 second) to thermal equilibrium. For54Mn in MnCl2.4H2O, hyperfine parameters A=-203.75 MHz, P=0.155 MHz and the exchange/ crystal field parameter combination Bex + 4|D|/gμB=1.355 T have been determined from good agreement between perturbation theory to second order and detailed NMRON results in applied fields parallel to the easy axis in the range 0-0.7 T. Splitting of observed lines in zero applied field (- 3.05 MHz) is mainly due to the pseudo-quadrupole (second order magnetic) interaction. Small third order effects (∼0.05 MHz) have been resolved. © 1983 J.C. Baltzer Scientific Publishing Company. |
| first_indexed | 2024-03-07T00:52:00Z |
| format | Journal article |
| id | oxford-uuid:86b86e25-9ecf-49e7-a733-12df235541b0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:52:00Z |
| publishDate | 1983 |
| publisher | Baltzer Science Publishers, Baarn/Kluwer Academic Publishers |
| record_format | dspace |
| spelling | oxford-uuid:86b86e25-9ecf-49e7-a733-12df235541b02022-03-26T22:05:51ZHIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGIONJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:86b86e25-9ecf-49e7-a733-12df235541b0EnglishSymplectic Elements at OxfordBaltzer Science Publishers, Baarn/Kluwer Academic Publishers1983Dearaujo, MBowden, GClark, RStone, NA practical method of nuclear spin cooling in the mK region, based on dramatic reduction in the spin-lattice relaxation time T1 at the antiferromagnetic-spin flop and spin flopparamagnetic phase transitions, is described. Far lower temperatures (down to 13 mK) than have been obtained to date (∼ 90 mK) are achieved in reasonable times, greatly increasing the sensitivity of NMRON. Following resonance, active isotope spins can be rapidly reset (in times ∼ 1 second) to thermal equilibrium. For54Mn in MnCl2.4H2O, hyperfine parameters A=-203.75 MHz, P=0.155 MHz and the exchange/ crystal field parameter combination Bex + 4|D|/gμB=1.355 T have been determined from good agreement between perturbation theory to second order and detailed NMRON results in applied fields parallel to the easy axis in the range 0-0.7 T. Splitting of observed lines in zero applied field (- 3.05 MHz) is mainly due to the pseudo-quadrupole (second order magnetic) interaction. Small third order effects (∼0.05 MHz) have been resolved. © 1983 J.C. Baltzer Scientific Publishing Company. |
| spellingShingle | Dearaujo, M Bowden, G Clark, R Stone, N HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title | HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title_full | HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title_fullStr | HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title_full_unstemmed | HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title_short | HIGH-PRECISION MN-54 NMRON IN ANTIFERROMAGNETIC MNCL2.4H2O, USING A NEW METHOD OF NUCLEAR-SPIN COOLING IN THE MK REGION |
| title_sort | high precision mn 54 nmron in antiferromagnetic mncl2 4h2o using a new method of nuclear spin cooling in the mk region |
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