  Neutron scattering experiments were performed on the undoped and hole-doped
Ca$_{2+x}$Y$_{2-x}$Cu$_5$O$_{10}$, which consists of ferromagnetic edge-sharing
CuO$_2$ chains. It was previously reported that in the undoped
Ca$_2$Y$_2$Cu$_5$O$_{10}$ there is an anomalous broadening of spin-wave
excitations along the chain, which is caused mainly by the antiferromagnetic
interchain interactions [Matsuda $et$ $al.$, Phys. Rev. B 63, 180403(R)
(2001)]. A systematic study of temperature and hole concentration dependencies
of the magnetic excitations shows that the magnetic excitations are softened
and broadened with increasing temperature or doping holes irrespective of $Q$
direction. The broadening is larger at higher $Q$. A characteristic feature is
that hole-doping is much more effective to broaden the excitations along the
chain. It is also suggested that the intrachain interaction does not change so
much with increasing temperature or doping although the anisotropic interaction
and the interchain interaction are reduced. In the spin-glass phase ($x$=1.5)
and nearly disordered phase ($x$=1.67) the magnetic excitations are much
broadened in energy and $Q$. It is suggested that the spin-glass phase
originates from the antiferromagnetic clusters, which are caused by the hole
disproportionation.
