#### Pregled bibliografske jedinice broj: 84605

## Slow relaxation experiments in disordered charge and spin density waves: collective dynamics of randomly distributed solitons.

Slow relaxation experiments in disordered charge and spin density waves: collective dynamics of randomly distributed solitons.

*// European Physical Journal B,*

**26**(2002), 4; 417-430 (međunarodna recenzija, članak, znanstveni)

**Naslov**

Slow relaxation experiments in disordered charge and spin density waves: collective dynamics of randomly distributed solitons.

**Autori**

Melin, Regis ; Biljaković, Katica ; Lasaunias, Jean-Claude ; Monceau, Pierre

**Izvornik**

European Physical Journal B (1434-6028) **26**
(2002), 4;
417-430

**Vrsta, podvrsta i kategorija rada**

Radovi u časopisima, članak, znanstveni

**Ključne riječi**

Charge/spin-density-waves; disordered systems; complex relaxation; soliton

**Sažetak**

We show that the dynamics of disordered charge density waves (CDWs) and spin density waves (SDWs) is a collective phenomenon. The very low temperature specific heat relaxation experiments are characterized by "interrupted" ageing (meaning that there is a maximal relaxation time) and a broad power-law spectrum of relaxation times, which is the signature of a collective phenomenon. We propose a random energy model that can reproduce these two observations and from which it is possible to obtain an estimate of the glass cross-over temperature (typically, T/sub g/ approximately=100-200 mK). The broad relaxation time spectrum can also be obtained from the solutions of two microscopic models involving randomly distributed solitons. The collective behavior is similar to domain growth dynamics in the presence of disorder and can be described by the dynamical renormalization group that was proposed recently for the one dimensional random field Ising model (D.S. Fisher et al., 1998). The typical relaxation time scales like tau /sup typ/~ tau /sub 0/ exp (T/sub g//T). The glass cross-over temperature T/sub g/ related to correlations among solitons is equal to the average energy barrier and scales like T/sub g/~2 xi /sub 0/ Delta . x is the concentration of defects, xi /sub 0/ the correlation length of the CDW or SDW and Delta the charge or spin gap.

**Izvorni jezik**

Engleski

**Znanstvena područja**

Fizika

**POVEZANOST RADA**

**Projekt / tema**

00350107

**Ustanove**

Institut za fiziku, Zagreb

**Autor s matičnim brojem:**

Katica Biljaković, (76732)

#### Časopis indeksira:

- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus

#### Uključenost u ostale bibliografske baze podataka:

- The INSPEC Science Abstracts series