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Low temperature specific heat of blue bronze K/sub 0.30/MoO/sub 3/. (CROSBI ID 95029)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Odin, Jean ; Lasjaunias, Jean-Claude ; Biljaković, Katica ; Hasselbach, Klaus ; Monceau, Pierre Low temperature specific heat of blue bronze K/sub 0.30/MoO/sub 3/. // European physical journal B : condensed matter physics, 24 (2001), 3; 315-322-x

Podaci o odgovornosti

Odin, Jean ; Lasjaunias, Jean-Claude ; Biljaković, Katica ; Hasselbach, Klaus ; Monceau, Pierre

engleski

Low temperature specific heat of blue bronze K/sub 0.30/MoO/sub 3/.

We report on specific heat measurements of the quasi-one-dimensional model system blue bronze K/sub 0.3/MoO/sub 3/, performed over a wide temperature interval 0.1-30 K, in its charge density wave (CDW) ground state. In this T range, the specific heat is successively determined by the presence of low-energy excitations (LEE) due to the disordered nature of the CDW ground-state, the acoustical phonon contribution which obeys an exact T/sup 3/ law between 0.7 and 3.5 K, and a large excess of C/T/sup 3/ centered at 11.5-13 K. The contribution of the LEEs is of particularly low amplitude in comparison to other CDW systems. Also, feeble time-dependent effects could be detected. This implies a less disordered ground state in this compound. The C/T/sup 3/ bump, mainly of phononic origin, can be partly ascribed to a phason-excitation contribution, with a low-energy cut-off defined by the pinning energy. This interpretation is supported by the sensitivity of the low-T side of the bump to the purity of samples, and therefore to their pinning frequency. A similar effect was already measured in the specific heat of the CDW compound (TaSe/sub 4/)/sub 2/I, by comparison between pure and doped samples. Finally, we outline once more that some generic thermodynamic properties of CDW systems are similar to structurally disordered systems.

charge-density-waves; thermal properties; disordered systems

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Podaci o izdanju

24 (3)

2001.

315-322-x

objavljeno

1434-6028

Povezanost rada

Fizika

Indeksiranost