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63 Cu Nuclear Quadrupole Relaxation in Cu 2 O
Author(s) -
Okubo N.,
Igarashi M.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199910)215:2<1109::aid-pssb1109>3.0.co;2-e
Subject(s) - nuclear quadrupole resonance , raman spectroscopy , quadrupole , spin–lattice relaxation , condensed matter physics , relaxation (psychology) , chemistry , lattice (music) , instability , nuclear magnetic resonance , physics , atomic physics , quantum mechanics , psychology , social psychology , acoustics
63 Cu nuclear spin–lattice relaxation time has been measured from 4.2 to 420 K. The result is analyzed with a theory of the Raman process based on covalency. By the fitting a value of 123.2 K is obtained for the Debye temperature, in contrast to the values of 180 to 190 K reported from other experiments. Then, a measure of covalency of the Cu–O bond is also calculated to be smaller by a factor of five than another measure of covalency calculated from the resonance frequency. These are attributed to the lattice instability and inappropriate value of the repulsive range parameter. It is concluded that the first‐order Raman process due to covalency contributes significantly to the relaxation in Cu 2 O.