Skip to main content
placeholder image

Comparison of 8Li and 9Li spin relaxation in SrTiO3 and Pt: A means to distinguish magnetic and electric quadrupolar sources of relaxation

Conference Paper


Abstract


  • We demonstrate that the ratio of 1/T1 spin–lattice relaxation rates (SLR) of two different isotopes (here 8Li and 9Li) can be used in order to identify the predominant relaxation mechanism within the β-NMR technique. We studied with both isotopes a Pt foil and two samples of single crystal SrTiO3. In Pt, the ratio of the SLR rates was 6.82(29), which is close to but less than the theoretical limit of ∼7.68 for pure magnetic relaxation. In SrTiO3, the weighted averaged SLR ratio of the two samples was 2.7(3), which is close but larger than the theoretical limit of ∼2.14 expected for pure electric quadrupolar relaxation. This indicates that the primary source of relaxation in SrTiO3 is electric quadrupolar in origin and that magnetic effects have a much smaller importance in this material. The low effective asymmetry of 9Li was the dominant cause of uncertainty of the measurements in this study. We propose a system of tagging the beta-decays in coincidence with the alpha decays that take place in two of the three primary decay channels of 9Li as a way of increasing the effective asymmetry and enhance the signal of 9Li β-NMR.

UOW Authors


  •   Chatzichristos, Aris (external author)
  •   Mcfadden, R M. L. (external author)
  •   Karner, V L. (external author)
  •   Cortie, David
  •   Levy, C D. P. (external author)
  •   Macfarlane, W A. (external author)
  •   Morris, G D. (external author)
  •   Pearson, M R. (external author)
  •   Salman, Z (external author)
  •   Kiefl, R F. (external author)

Publication Date


  • 2018

Citation


  • Chatzichristos, A., McFadden, R. M. L., Karner, V. L., Cortie, D. L., Levy, C. D. P., MacFarlane, W. A., Morris, G. D., Pearson, M. R., Salman, Z. & Kiefl, R. F. (2018). Comparison of 8Li and 9Li spin relaxation in SrTiO3 and Pt: A means to distinguish magnetic and electric quadrupolar sources of relaxation. Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (μSR2017) (pp. 011048-1-011048-9). Tokyo, Japan: The Physical Society of Japan.

Start Page


  • 011048-1

End Page


  • 011048-9

Place Of Publication


  • Tokyo, Japan

Abstract


  • We demonstrate that the ratio of 1/T1 spin–lattice relaxation rates (SLR) of two different isotopes (here 8Li and 9Li) can be used in order to identify the predominant relaxation mechanism within the β-NMR technique. We studied with both isotopes a Pt foil and two samples of single crystal SrTiO3. In Pt, the ratio of the SLR rates was 6.82(29), which is close to but less than the theoretical limit of ∼7.68 for pure magnetic relaxation. In SrTiO3, the weighted averaged SLR ratio of the two samples was 2.7(3), which is close but larger than the theoretical limit of ∼2.14 expected for pure electric quadrupolar relaxation. This indicates that the primary source of relaxation in SrTiO3 is electric quadrupolar in origin and that magnetic effects have a much smaller importance in this material. The low effective asymmetry of 9Li was the dominant cause of uncertainty of the measurements in this study. We propose a system of tagging the beta-decays in coincidence with the alpha decays that take place in two of the three primary decay channels of 9Li as a way of increasing the effective asymmetry and enhance the signal of 9Li β-NMR.

UOW Authors


  •   Chatzichristos, Aris (external author)
  •   Mcfadden, R M. L. (external author)
  •   Karner, V L. (external author)
  •   Cortie, David
  •   Levy, C D. P. (external author)
  •   Macfarlane, W A. (external author)
  •   Morris, G D. (external author)
  •   Pearson, M R. (external author)
  •   Salman, Z (external author)
  •   Kiefl, R F. (external author)

Publication Date


  • 2018

Citation


  • Chatzichristos, A., McFadden, R. M. L., Karner, V. L., Cortie, D. L., Levy, C. D. P., MacFarlane, W. A., Morris, G. D., Pearson, M. R., Salman, Z. & Kiefl, R. F. (2018). Comparison of 8Li and 9Li spin relaxation in SrTiO3 and Pt: A means to distinguish magnetic and electric quadrupolar sources of relaxation. Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (μSR2017) (pp. 011048-1-011048-9). Tokyo, Japan: The Physical Society of Japan.

Start Page


  • 011048-1

End Page


  • 011048-9

Place Of Publication


  • Tokyo, Japan