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Up: 6.2 Spin-Peierls material CuGeO
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In Fig.55, SR spectra of the nominally
pure system are shown. There was slow relaxation observed below K, but, as shown by the longitudinal field (LF) measurements in the
inset, the relaxation is in the fast fluctuation regime; in the LF measurements,
the relaxation was present up to LF G, while the zero-field
relaxation rate corresponds to G, if it were caused by
static field distribution. (See section 3.4 for SR spectroscopic technique.) Our SR measurements of the nominally pure CuGeO3 confirmed the absence of
static order down to 50 mK.
SR spectra of the nominally pure CuGeO3. The inset is longitudinal
field decoupling measurements to investigate field fluctuations. The
solid lines are fits with square-root exponential function, which is
appropriate for paramagnetic dilute spin systems (see section 3.2
in Chapter 3).