Abstract
We present elastic and inelastic neutron scattering results on spin-1/2 chain antiferromagnet $\text{D-}{\mathrm{F}}_{5}\text{PNN}$. We show that a structural transition occurs in zero field below ${T}_{c}\ensuremath{\sim}710\text{ }\text{mK}$ from $C2/c$ space group (uniform chains) to $Pc$ (bond-alternating chains). When applying a magnetic field at 50 mK, the space group gets back to $C2/c$ above ${H}_{c1}\ensuremath{\sim}1\text{ }\text{T}$. From the dispersion curves of the magnetic excitations measured at $T=50\text{ }\text{mK}$, we determine the values of the exchange parameters at 0 and 9 T, which evidence that the magnetic field makes the chains evolve from alternating to uniform. This change in behavior can be correlated unambiguously with the field-induced structural transition. These results evidence ``mirror'' field- and temperature-induced magnetocrystalline transitions.
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