Nucleus–phonon interactions of MCsSO4 (M=Na,K,orRb) single crystals studied using spin–lattice relaxation time
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The structural properties and relaxation processes of MCsSO4 (M = Na, K, or Rb) crystals were investigated by measuring the NMR spectra and spin–lattice relaxation rates 1/T1 of their 23Na, 39K, 87Rb, and 133Cs nuclei. According to the NMR spectra, the MCsSO4 crystals contain two crystallographically inequivalent sites each for the M and Cs ions. Further, the relaxation rates of all these nuclei do not change significantly over the investigated temperature range, indicating that no phase transitions occur in these crystals in this range. The variations in the 1/T1 values of the 23Na, 39K, 87Rb, and 133Cs nuclei in these three crystals with increasing temperature are approximately proportional to T2, indicating that Raman processes may be responsible for the relaxation. Therefore, for nuclear quadrupole relaxation of the 23Na, 39K, 87Rb, and 133Cs nuclei, Raman processes with n = 2 are more effective than direct processes.
Abstract
The structural properties and relaxation processes of MCsSO4 (M = Na, K, or Rb) crystals were investigated by measuring the NMR spectra and spin–lattice relaxation rates 1/T1 of their 23Na, 39K, 87Rb, and 133Cs nuclei. According to the NMR spectra, the MCsSO4 crystals contain two crystallographically inequivalent sites each for the M and Cs ions. Further, the relaxation rates of all these nuclei do not change significantly over the investigated temperature range, indicating that no phase transitions occur in these crystals in this range. The variations in the 1/T1 values of the 23Na, 39K, 87Rb, and 133Cs nuclei in these three crystals with increasing temperature are approximately proportional to T2, indicating that Raman processes may be responsible for the relaxation. Therefore, for nuclear quadrupole relaxation of the 23Na, 39K, 87Rb, and 133Cs nuclei, Raman processes with n = 2 are more effective than direct processes.
참고문헌 (33)
- H.I. Abd El-Kader, , Qatar Univ. Sci. J, 14(c), pp.100~ (1994)
- S.M. Haile, , Nature, 410, pp.910~ (2001)
- H. Kamimura, , Philos. Mag, B81, pp.1011~ (2001)
- Y. Matsuo, , J. Phys. Soc. Jpn, 70, pp.2934~ (2001)
- T. Norby, , Nature, 410, pp.877~ (2001)
- Y. Matsuo, , Solid State Commun, 120, pp.85~ (2001)
- Y. Matsuo, , Ferroelectrics, 272, pp.199~ (2002)
- H. Kamimura, , Phys. Status Solidi B, 241, pp.61~ (2004)
- B. Mroz, , Ferroelectrics, 42, pp.459~ (1982)
- T. Krajewski, , Ferroelectrics, 55, pp.811~ (1984)
- M. E. Kassem, , Rev. Phys. Appl, 19, pp.445~ (1984)
- M. E. Kassem, , J. Mat. Sci. Lett, 7, pp.1007~ (1988)
- K. S. Aleksandrov, , Sov. Phys. Solid State, 22, pp.215~ (1980)
- H. Mashiyama, , J. Phys. Soc. Japan, 47, pp.1198~ (1979)
- B. Kihal, , J. Phys. C, 20, pp.4491~ (1987)
- T. Mitsui, , J. Phys. Soc. Japan, 39, pp.845~ (1975)
- M.E. Hiues, "Principles and Applications of Ferroelectrics and Related Materials", Clarendon Press
- M. E. Kassem, , J. Mat. Sci. Lett, 6, pp.507~ (1987)
- H. P. Beerman, , Ferroelectrics, 2, pp.123~ (1977)
- M. Igarashi, , Z. Naturforsch, 47a, pp.313~ (1992)
- J. J. Van der Klink, , Phys. Rev. B, 27, pp.89~ (1983)
- A. Avogadro, , Phys. Status Solidi B, 44, pp.639~ (1971)
- E.R. Andrew, , Proc. Phys. Soc. (London), 78, pp.1~ (1961)
- D.P. Tewari, , Phys. Rev, 129, pp.1975~ (1963)
- M. A. Gordon, , J. Phys. C : Solid State Phys, 11, pp.783~ (1978)
- A, Abragam, "The Principles of Nuclear Magnetism" (1961), Oxford University Press
- A.R. Lim, , Phys. Status Solidi B, 246, pp.2372~ (2009)
- H. J. Kim, , Phys. Rev. B, 61, pp.9307~ (2000)
- R. Bohmer, , Prog. Nucl. Magn. Reson. Spectrosc, 50, pp.87~ (2007)
- A. R. Lim, , J. Appl. Phys, 106, pp.93522~ (2009)
- J. Van Kranendonk, , Phys. Rev. Lett, 18, pp.701~ (1967)
- J. Van Kranendonk, , Physica B, 20, pp.781~ (1954)
- J. Van Kranendonk, , Can. J. Phys, 46, pp.2441~ (1968)