Transverse helicoidal ordering of the proton spins in Ca(OH)2at positive spin temperatures
| Autor: | J.C.M. Sprenkels, N.J. Poulis, W T Wenckebach |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Condensed Matter::Quantum Gases
Materials science Condensed matter physics Spins Dynamic nuclear polarisation General Engineering General Physics and Astronomy Condensed Matter Physics Magnetic field Dipole Transverse plane Residual dipolar coupling Proton spin crisis Condensed Matter::Strongly Correlated Electrons Nuclear Experiment Adiabatic process |
| Zdroj: | Journal of Physics C: Solid State Physics. 18:421-441 |
| ISSN: | 0022-3719 |
| DOI: | 10.1088/0022-3719/18/2/020 |
| Popis: | Experimental evidence is presented for the occurrence of a nuclear dipolar magnetic ordering of the proton spins in Ca(OH)2 at positive spin temperature in a high externally applied magnetic field H0. The ordering was produced by dynamic nuclear polarisation (DNP) and adiabatic demagnetisation in the rotating frame (ADRF). From simultaneous measurement of the entropy and the dipolar energy the authors determined the dipolar temperature of the proton spin system after the ADRF. Furthermore an analysis of the NMR absorption lineshape was made. From this analysis of the NMR lineshape and from measurements of the transverse susceptibility as a function of the dipolar energy and the temperature they conclude that a transverse magnetic ordering with a helical structure is created during the ADRF. |
| Databáze: | OpenAIRE |
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