New phase diagram of Zn-doped CuGeO3

Details New phase diagram of Zn-doped CuGeO3 New phase diagram of Zn-doped CuGeO3

1996-03-28

arxiv.org/abs/cond-mat/9603185v1

Phys. Rev. B 54, R6835 (1996)

Physics

Condensed Matter

9 pages, RevTeX manuscript, 4 ps figures included. Submitted to Phys. Rev. B. Also available from http://insti.physics.sunys

Scientific paper

10.1103/PhysRevB.54.R6835

A series of high-quality single crystals of Cu$_{1-x}$Zn$_x$GeO$_3$ have been examined by neutron scattering techniques. An antiferromagnetic (AF) ordering is confirmed for samples with $x\geq 0.02$, in complete agreement with previous reports. We show that the spin-Peierls (SP) phase transition persists to 6\% Zn, whereas previous magnetic susceptibility measurements reported a deterioration of the SP transition above 2\% Zn. We present some details of the successive transitions upon lowering temperature into the spin-Peierls phase which is followed by a transition into an antiferromagnetically ordered phase. Below the N\'eel temperature we observe the coexistence of the SP lattice dimerization and AF states.

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