共查询到20条相似文献,搜索用时 15 毫秒
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J.C. Lasjaunias P. Monceau D. Starešinić K. Biljaković 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,28(2):187-190
Eur. Phys. J. B 24, 315 (2001) In our Reply to the Comment [#!1!#] we refute the “straightforward” interpretation of the excess low-temperature
specific heat, Cp, contribution we have measured in our study of CDW systems K0.3MoO3 and (TaSe4)2I [#!2!#] as originating solely from normal phonon modes. The specific sensitivity of the bump in C
p
/
T
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at low temperatures to the impurity content is consistent with the increased value of the phason pinning gap while the dispersion
of normal phonons remains unaffected. We ascribe at least this part of the anomaly to the phason contribution. As stated in
reference [3] that the phonon density of states extracted from neutron scattering measurements is the least reliable in this
energy range (<0.5 meV), we conclude that Cp measurements are more accurate for detecting the phason contribution.
Received 17 April 2002 Published online 19 July 2002 相似文献
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We show that the infrared reflectance of the quasi-one dimensional charge-density-wave (CDW) conductor K0.3MoO3 (blue bronze) varies with position when a voltage greater than the CDW depinning threshold is applied. The spatial dependence and spectra associated with these changes are generally as expected from the electro-transmission [B.M. Emerling, et al., Eur. Phys. J. B 16, 295 (2000)], but there are differences which might be associated with changes in the CDW properties on the surface. We have examined the electro-reflectance spectrum associated with CDW current investigation for light polarized parallel to the conducting chains for signs of expected current-induced intragap states, and conclude that the density of any such states is at least an order of magnitude less than expected.Received: 23 June 2003, Published online: 2 October 2003PACS:
71.45.Lr Charge-density-wave systems - 78.20.Jq Electrooptical effects - 72.15.Nj Collective modes (e.g., in one-dimensional conductors) 相似文献
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Greaves GN Wilding MC Hennet L Langstaff D Kargl F Benmore CJ Weber JK 《Physical review letters》2011,106(11):119601; author reply 119602
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B.M. Emerling M.E. Itkis J.W. Brill 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,16(2):295-301
The infrared transmission of the quasi-one dimensional charge-density-wave (CDW) conductor blue bronze (K0.3MoO3) is affected by polarization of the CDW, and therefore by application of a voltage near or above the threshold for CDW depinning.
In this paper, we compare the spectra associated with the relative change in transmission taken for different temperatures and oscillating voltages. We find that the phonon spectrum is affected by CDW polarization;
the linewidths or frequencies of most phonons change by cm-1. However, no new intragap states that can be associated with current injection are observed; i.e. the spectra associated with polarization of the CDW in the crystal bulk is identical to that associated with CDW current
injection near the contacts. Our results indicate that, for light polarized perpendicular to the conducting chains, the density
(n), cross-section , and bandwidth of intragap states are related by: n
(?cm-1)-1. For expected values of the cross-section and bandwidth, this implies that the intragap states can be optically excited for
a time less than s.
Received 21 February 2000 相似文献
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J.W. Brill 《Solid State Communications》2004,130(7):437-439
In recent measurements on the charge-density-wave (CDW) conductor blue bronze (K0.3MoO3), the electro-transmittance and electro-reflectance spectra were searched for intragap states that could be associated with solitons created by injection of electrons into the CDW at the current contacts [Eur. Phys. J. B16 (2000), 295; Eur. Phys. J. B35 (2003) 233]. In this work, we adapt the model of soliton absorption in dimerized polyacetylene to the blue bronze results, to obtain the (order of magnitude) estimate that current induced solitons occur on less than ∼10% of the conducting chains. We discuss the implications of these results on models of soliton lifetimes and motion of CDW phase dislocations. 相似文献
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