Magnetic field influence on the low-temperature heat capacity of the CDW compound blue bronze

Lasjaunias, J.C.; Sahling, S.; Biljaković, Katica; Monçeau, P.; Marcus, J.

doi:10.1016/j.jmmm.2004.11.306

Cited by 8 publications

(12 citation statements)

References 10 publications

(18 reference statements)

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“…3 shows the dependence of the heat capacity on the magnetic field at 80 mK. As already indicated in Introduction, the high sensitivity to the magnetic field at low temperature seems to be a characteristic feature of 1D materials with SDW or CDW, since it was observed in all previously investigated materials [8,9,10]. It was also observed in unpublished results of the spin-Peierls system (TMTTF) 2 PF 6 .…”

Section: Short Time Heat Capacitysupporting

confidence: 58%

“…Thereafter, R. Mélin et al [6,7] improved this model, by taking in account the interactions between the soliton excitations created at different pinning centers, which provided interpretations of specific properties like "interrupted aging", the short-time scale T α contribution to heat capacity, the strongly timedependent T -2 contribution which is the consequence of the TLS energy landscape. We have recently pointed out the strong sensitivity of the low-T heat capacity to moderate magnetic fields, in either CDW [8,9] or SDW [10] systems. In particular, hysteretic effects can occur during the first field excursion, with B not exceeding 1T , as observed in two CDW compounds, namely o-TaS 3 and the blue bronze Rb 0.3 MoO 3 [8], which results in a new metastable branch.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF)2Br: effect of a magnetic field

et al. 2007

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We have investigated the effect of the magnetic field (B) on the very low-temperature equilibrium heat capacity c eq of the quasi-1 D organic compound (TMTTF) 2 Br , characterized by a commensurate Spin Density Wave (SDW) ground state. Below 1K, c eq is dominated by a Schottky-like A S T -2 contribution, very sensitive to the experimental time scale, a property that we have previously measured in numerous DW compounds. Under applied field (in the range 0.2-7 T), the equilibrium dynamics, and hence c eq extracted from the time constant, increases enormously. For B ≥ 2-3 T, c eq varies like B 2 , in agreement with a magnetic Zeeman coupling. Another specific property, common to other Charge/Spin density wave (DW) compounds, is the occurrence of metastable branches in c eq , induced at very low temperature by the field exceeding a critical value. These effects are discussed within a generalization to SDWs in a magnetic field of the available Larkin-Ovchinnikov local model of strong pinning. A limitation of the model when compared to experiments is pointed out.

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Section: Short Time Heat Capacitysupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF)2Br: effect of a magnetic field

et al. 2007

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“…In this model of CDW in a Luttinger Liquid, spins degrees of freedom are coupled to H by Zeeman coupling both in CDW systems as well as in SDW ones. It results that the specific heat is magnetic field dependent in CDWs and in SDWs, as experimentally found [690,691,700]. On the other hand, in the model developed in refs [692,700,701] solely the spin degrees of freedom of bisolitons in SDWs are coupled to H.…”

Section: 33b Collective Dynamics In a Strong Pinning Modelsupporting

confidence: 61%

“…That reflects again the strong difference between very "similar" compounds as far as the low T properties are concerned, very likely because a strong difference in the defect concentration. The time-dependent non exponential energy relaxation exhibits quite different properties according to the nature of the modulated ground state [689][690][691]: figure 7.14(a) shows the time dependence of the relaxation ∆T /∆T 0 for (TMTSF) 2 PF 6 at 200 mK. This relaxation can be satisfactory fitted with a phenomenological stretched-exponential function ∆T (t) ∆T0 = exp(−t/τ ) β , with β the stretching parameter.…”

Section: Non-equilibrium Dynamicsmentioning

confidence: 99%

Electronic crystals: an experimental overview

Monceau

2013

Preprint

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This article reviews the static and dynamic properties of spontaneous superstructures formed by electrons. Representations of such electronic crystals are charge density waves and spin density waves in inorganic as well as organic low dimensional materials. A special attention is paid to the collective effects in pinning and sliding of these superstructures, and the glassy properties at low temperature. Charge order and charge disproportionation which occur in organic materials resulting from correlation effects are analysed. Experiments under magnetic field, and more specifically field-induced charge density waves are discussed. Properties of meso-and nanostructures of charge density waves are also reviewed.

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“…This leads to a non-exponential thermal relaxation and an additional contribution to the heat capacity below 1K which strongly depends on the time and magnetic field [1][2][3][4][5] . It was not possible to determine the equilibrium heat capacity of this contribution in materials with incommensurate CDW or SDW up to now, since the maximum of the relaxation time spectrum was too long in comparison to the time window of the experiment 5 .…”

Section: Introductionmentioning

confidence: 99%

Relaxation time spectrum of low-energy excitations in one- and two-dimensional materials with charge or spin density waves

et al. 2016

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The long-time thermal relaxation of (TMTTF)2Br, Sr14Cu24O41 and Sr2Ca12Cu24O41 single crystals at temperatures below 1 K and magnetic field up to 10 T is investigated. The data allow us to determine the relaxation time spectrum of the low energy excitations caused by the charge-density wave (CDW) or spin-density wave (SDW). The relaxation time is mainly determined by a thermal activated process for all investigated materials. The maximum relaxation time increases with increasing magnetic field. The distribution of barrier heights corresponds to one or two Gaussian functions. The doping of Sr14−xCaxCu24O41 with Ca leads to a drastic shift of the relaxation time spectrum to longer time. The maximum relaxation time changes from 50 s (x = 0) to 3000 s (x = 12) at 0.1 K and 10 T. The observed thermal relaxation at x=12 clearly indicates the formation of the SDW ground state at low temperatures.

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Magnetic field influence on the low-temperature heat capacity of the CDW compound blue bronze

Cited by 8 publications

References 10 publications

Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF)2Br: effect of a magnetic field

Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF)2Br: effect of a magnetic field

Electronic crystals: an experimental overview

Relaxation time spectrum of low-energy excitations in one- and two-dimensional materials with charge or spin density waves

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