Inertial dynamics of pinned charge-density-wave condensates. I.<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Reagor, D.; Sridhar, S.; Grüner, G.

doi:10.1103/physrevb.34.2212

Cited by 48 publications

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References 31 publications

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“…3 The bridges operate on an interferometer principle with precision attenuators and phase shifters used to null the output of an arm containing a sample against that of a reference arm. Here we only discuss the equivalent circuit for the termination admittance…”

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confidence: 99%

Large dielectric constants and massive carriers inLa2CuO4

et al. 1989

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We report measurements of the conductivity and dielectric constant as a function of frequency and temperature on samples of La2Cu04 from dc to 100 GHz. An analysis of the frequency dependence of the complex conductivity indicates that the high-frequency dielectric constant is large ( = 50) and weakly temperature dependent. The dc charge carriers are massive (1100m e ), weakly damped, and partially pinned.

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Large dielectric constants and massive carriers inLa2CuO4

et al. 1989

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“…This behavior is explained by the CDW collective displacement around the pinning center with a finite damping time and corresponds to the results of a previous experiment for NbSe 3 whiskers. 7,8 There is almost no frequency dependence in the low-frequency region below 1 MHz. Therefore, we assumed the temperature dependence at 300 kHz to be the same as that at a dc voltage.…”

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“…4 A CDW has rich electrical properties such as the nonlinear current-voltage ͑I-V͒ characteristic, 5 narrow-band noise, 6 and frequencydependent resistance. 7,8 The CDW was proposed as a model of superconductivity by Fröhlich in 1954, because an incommensurate CDW can flow without dissipation in an ideal crystal. 9 In reality, a CDW supercurrent has never been observed because the crystal edges or impurities act as pinning centers.…”

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Topological effects of charge density waves in ring-shaped crystals ofNbSe3

Matsuura

Tsuneta²,

Inagaki

et al. 2006

Phys. Rev. B

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We studied the differences of the charge density wave ͑CDW͒ dynamics in closed-ring and open-ring topologies by measuring the frequency-dependent resistance in the radio-frequency range. We performed a two-probe ac resistance measurement for a ring-shaped crystal of niobium triselenide ͑NbSe 3 ͒ in the 300 kHz to 1.3 GHz frequency range. We compared the frequency dependence of the resistance of closed-ring and open-ring crystals and found that the pinning potential in the former is smaller than that in the latter. The open-ring crystal was obtained by changing of the topology of the closed-ring crystal. We believe that the reduction in the pinning effect is caused by a CDW circulating current in the closed-ring topology.

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“…1. For all these systems the phason damping and the phason gaps have been directly measured [5][6][7][8][9] and the amplitude of the quasilinear term C osc =T ÿ=! 2 0 can be readily estimated as shown by large symbols in Fig.…”

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Comment on “Explanation of the Glasslike Anomaly in the Low-Temperature Specific Heat of Incommensurate Phases”

Biljaković

2006

Phys. Rev. Lett.

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Recently Cano and Levanyuk proposed an attractive conjecture for explaining the glasslike anomaly in specific heat at low temperature (low-T C p ) of incommensurate (IC) phases based on the phason damping [1]. The universal features of glasses, i.e., the bump in C p =T 3 and the quasilinear (or power-law) contribution C p T have also been found in low-T C p of charge density wave (CDW) systems [2], which can be related to the glass transition in the CDW superstructure observed in dielectric spectroscopy [3]. The CDW pinning resonance, i.e., the phason gap, was considered as analogous to the wellknown boson peak found in glasses [3]. Moreover, we have been able to explain the bump in C p =T 3 using a modified model of the gapped or pinned phason which, however, neglects the phason damping. The explanation of the quasilinear contribution to C p in terms of damping urged us to check the applicability to CDW systems which can be considered as canonical IC example. In the following we show that the theory presented in [1] is still not suitable to explain the quasilinear contribution to C p in IC systems.Two main features follow from the Eq.(2) of [1]: (i) C p linear in T, and (ii) its amplitude being proportional to ÿ=! 2 0 (ÿ representing damping and ! 0 phason gap). However, for the two examples given in [1], biphenyl (gapless phason) and ClC 6 H 4 2 SO 2 (BCPS) (gapped phason), the T dependence is evidently Cp T 2 [4]. Besides, the estimated amplitudes are 100 times bigger than the measured ones.The last is also true for the third example of IC-CDW system the blue bronze, K 0:3 MoO 3 . But at least this system shows a sublinear contribution, a common property of all CDW systems, as seen in Fig. 1. For all these systems the phason damping and the phason gaps have been directly measured [5][6][7][8][9] and the amplitude of the quasilinear term C osc =T ÿ=! 2 0 can be readily estimated as shown by large symbols in Fig. 1. These estimates, unfortunately, do not show any systematic correlation with the values measured for different compounds.In order to account for the discrepancy between measured and estimated values, the authors of [1] point out that the data for the damping are obtained for a very restricted region of the wave vectors, while they are needed for the whole Brillouin zone. However, they neglect that in the Kohn anomaly the damping is by far the strongest at the minimum frequency, i.e., at q 0 2k F , [6] and Ref.[23] of [1], making this narrow part of Brillouin zone dominant for their amplitude estimates. Nevertheless, to circumvent the problem we compare in Fig. 1 pure and doped systems. As doping increases the pinning frequency much more than the damping [8], while it does not influence other phonons, the expected amplitudes in doped samples should be an order of magnitude smaller than in pure samples. For TaS 3 and TaSe 4 2 I, however, doping actually increases slightly the amplitude which is also in disagreement with the proposed explanation.I thank E. Tutiš for valuable discussions and D. Starešinić...

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Inertial dynamics of pinned charge-density-wave condensates. I.NbSe3

Cited by 48 publications

References 31 publications

Large dielectric constants and massive carriers inLa2CuO4

Large dielectric constants and massive carriers inLa2CuO4

Topological effects of charge density waves in ring-shaped crystals ofNbSe3

Comment on “Explanation of the Glasslike Anomaly in the Low-Temperature Specific Heat of Incommensurate Phases”

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