Neutron spin echo and neutron spin depolarisation studies in Y9Co7

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Abstract
High-resolution, neutron spin echo and neutron spin depolarisation techniques have been used to study the dependence of the local fields on temperature and low applied magnetic field (up to 55 Oe) in both the 'hybrid' and superconducting states of Y9Co7. In zero field neither experiment shows neutron spin rotation effects in either state, whereas considerable effects have been observed in a small field (a few oersteds). For the hybrid state such effects can be reconciled with strong spin fluctuations of a kind that can easily be affected by even small fields. A comparison of the observed effects in the presence of small fields in the superconducting state with the theoretical expression has yielded information on the temperature dependence of the penetration depth lambda (T). In this state, the effects of spin fluctuations seem not to show up dramatically.