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This chapter presents our 
SR results of the spin-Peierls material
CuGeO3 and its Zn/Si doped compounds. In the nominally pure system,
the absence of static moments was confirmed down to 50 mK, supporting
the non-magnetic nature of the spin-Peierls ground state. In the
Zn-doped systems (Cu1-xZnx)GeO3 (x=2, 4 and 8%) and a Si-doped system
Cu(Ge1-ySiy)O3 (x=2 %), static order was observed below the Néel temperatures which have been reported previously. In the Zn-doped
systems, the characteristic magnitude of the local field (
)suggests that the size of the ordered moments takes a maximum at the
Zn concentration which gives the maximum Néel temperature.
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6.1 Introduction
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6.2 Spin-Peierls material CuGeO3
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6.2.1 Previous measurements
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Superlattice reflections
[#!KamimuraJPSJ94!#,#!PougetPRL94!#,#!HirotaPRL94!#]
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Softening of the lattice
[#!PoirierPRB95a!#,#!LorenzoPRB94!#,#!HarrisPRB94!#,#!NishiPRB95!#,#!ChenPRB95!#]
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Structural signature of SP
M
transition
[#!KiryukhinPRB95!#]
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Magnetic phase diagram
[#!HasePRB93!#,#!PoirierPRB95a!#]
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Spin Peierls gap
[#!NishiPRB94!#,#!FujitaPRL95!#]
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Spin relaxation measurements
[#!OseroffJAP94!#,#!BrillPRL94!#,#!ItohPRB95!#]
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.
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6.2.2 Non-magnetic ion doping
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6.2.3 SR measurements
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Nominally pure CuGeO3
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Zn-doped systems
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Si-doped system
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Discussion
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Absence of precession in the Zn-doped samples
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Doping dependence of the size of moment
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6.3 Summary