Naslov
Low temperature thermodynamical properties of the organic chain conductor (TMTSF)_2AsF_6.

Autori
Lasajunias, Jean Claude ; Biljaković, Katica ; Starešinić, Damir ; Monceau, Pierre ; Takashi, S. ; Yamada J. ; Nakatsuji Sh. ; Anzai, H.

Izvornik
European physical journal B : condensed matter physics (1434-6028) 7 (1999), 4; 541-550

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
lambda; Schottky and other anomalies in solids; spin-density waves in magnetically ordered materials; static properties of magnetic materials

Sažetak
We report on specific heat measurements of the quasi-one-dimensional organic salt (TMTSF)_2AsF_6 in its spin density wave state between 75 mK and 7 K. Similarly to (TMTSF)_2PF_6, we find discontinuities in the lattice contribution at 1.9 K and 3.5 K ascribed to sub-spin density wave phases. Time-dependent effects due to dynamics of low-energy excitations in metastable states occur only below 0.2 K which yields an activation energy for the equilibrium energy relaxation process of 0.34 K, 4-5 times smaller than found for (TMTSF)_2PF_6. Finally the reduction of the low-energy excitations contribution to the specific heat in comparison to PF_6 reveals an intermediate cubic-like regime between 0.25 and 0.5 K that we tentatively describe as the phason contribution of the incommensurate spin density wave modulation.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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