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                <title xml:lang="en">Magnetoelastic coupling in the spin-Peierls ground state of hydrogenated and deuterated (TMTTF) 2PF 6 salts</title>
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                    <forename type="first">Jean-Paul</forename>
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                <title level="j">Physical Review B: Condensed Matter and Materials Physics (1998-2015)</title>
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                  <publisher>American Physical Society</publisher>
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              <p>We report an ultrasonic study of the magneto-elastic coupling of the hydrogenated and deuterated (TMTTF) 2PF 6 organic salts. For both salts the temperature dependence of the longitudinal velocity along the c* axis displays a monotonic stiffening of the C 33 compressibility modulus upon cooling. Below the characteristic temperature scale 40 K the modulus stiffening becomes markedly enhanced, in concomitance with the reduction of spin degrees of freedom previously seen in magnetic measurements as low-dimensional precursors of the spin-Peierls transition. The magneto-elastic coupling appears to be much weaker in the hydrogenated salt due to the highly inhomogeneous elastic behavior induced by the proximity of the charge ordering transition to the spin-Peierls phase. For the deuterated salt, an important anomaly in the ultrasound velocity is observed below the spin-Peierls transition temperature T SP in agreement with scaling of the elastic deformation with the spin-Peierls order parameter. In spite of the weakly inhomogeneous character of the spin-Peierls phase transition, the magnetic field dependence of T SP is well captured with the mean-field prediction for the lattice distorted Heisenberg spin chain.</p>
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