We study theoretically the dynamics of frustrated spin-Peierls systems after a quench from the paramagnetic state to the magnetically ordered state. By constructing and numerical simulating a minimal model, we show that it can exhibit a transient noncollinear magnetic order before settling in the equilibrium collinear magnetic order. The transient magnetic order is selected by the phonon fluctuations originated from the initial state. Our results reveal a mechanism for controlling the phases of matter by exploiting incoherent, nonequilibrium fluctuations.

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• Frustrated magnetism
• Peierls transition
• Spin-phonon coupling
• Nonequilibrium systems
• Langevin equation
• Time-dependent Ginzburg-Landau theory