Negative Differential Resistance and Instability in Nb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Se</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Hall, R.P.; Sherwin, Mark S.; Zettl, A.

doi:10.1103/physrevlett.52.2293

Cited by 31 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a rule the nonlinear contribution to conductivity in conventional CDWs does not follow the J n power law. To the best of our knowledge, NbSe 3 is the only conventional CDW system which shows an NDR, 33 however the effect is very small and dwarfed by the drop in resistivity of α-(BEDT-TTF) 2 I 3 .…”

Section: Resultsmentioning

confidence: 85%

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

et al. 2012

View full text Add to dashboard Cite

Electric-field-dependent pulse measurements are reported in the charge-ordered state of α-(BEDT-TTF)2I3. At low electric fields up to about 50 V/cm only negligible deviations from Ohmic behavior can be identified with no threshold field. At larger electric fields and up to about 100 V/cm a reproducible negative differential resistance is observed with a significant change in shape of the measured resistivity in time. These changes critically depend whether constant voltage or constant current is applied to the single crystal. At high enough electric fields the resistance displays a dramatic drop down to metallic values and relaxes subsequently in a single-exponential manner to its low-field steady-state value. We argue that such an electric-field induced negative differential resistance and switching to transient states are fingerprints of cooperative domain-wall dynamics inherent to two-dimensional bond-charge density wave with ferroelectric-like nature.

show abstract

Section: Resultsmentioning

confidence: 85%

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

et al. 2012

View full text Add to dashboard Cite

show abstract

“…This possibility would help to understand why NDR is observed in the charge ordered state and disappears as a magnetic field of 8 T melts the charge order state into a ferromagnetic state. NDR has also been observed near 40 K in the prototypal charge-density wave (CDW) system NbSe 3 [14] above the threshold field for nonlinear conduction. Evidence of the significant contribution to the conductivity due to the depinning of these charge ordered domains emerge from those observations, reinforcing the possibility of observing NDR without significant Joule heating.…”

Section: Resultsmentioning

confidence: 93%

Current controlled negative differential resistance behavior in Co2FeO2BO3 and Fe3O2BO3 single crystals

Santos

Freitas

Fier

et al. 2016

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

I-V curves showing negative differential resistance (NDR) are reported for single crystals of Co 2 FeO 2 BO 3 at 315 K and 290 K and for Fe 3 O 2 BO 3 at 300 K, 260 K and 220 K. Resistivity measurements are presented for both systems, parallel and perpendicular to the c axis, in the range 315-120 K. The high hysteretic behavior of the I-V curves in Co 2 FeO 2 BO 3 around room temperature is discussed and the heat dissipated is estimated, suggesting an increase in the sample temperature of almost 22 K for the I-V curve at 315 K and a dominant contribution of Joule self-heating for the observed NDR. In contrast, insignificant hysteresis is observed on the I-V curves of Fe 3 O 2 BO 3 around room temperature. The depinning of charge order domains is suggested as the main contribution to the NDR phenomenon for Fe 3 O 2 BO 3. The high reproducibility of the NDR in the Fe 3 O 2 BO 3 single crystal allows its use as a low frequency oscillator, as it is demonstrated.

show abstract

“…In all cases it is a local effect occurring on a micron scale. Although early reports on macroscopic CDW dynamics have shown NDR in NbSe 3 [13,14] and in TaS 3 [8,12,15] crystals, we are not aware of any measurement nor prediction of NAR in CDW samples. In the remainder of this paper, we provide a qualitative explanation for this new effect.…”

mentioning

confidence: 81%

Negative Resistance and Local Charge-Density-Wave Dynamics

et al. 2001

View full text Add to dashboard Cite

Charge-density-wave (CDW) dynamics is studied on a submicron length scale in NbSe 3 and o-TaS 3 . Regions of negative absolute resistance are observed in the CDW sliding regime at sufficiently low temperatures. The origin of the negative resistance is attributed to the different forces that the deformed CDW and quasiparticles feel: the force on the CDW is merely caused by a difference of the electric potentials, while the quasiparticle current is governed by a difference of the electrochemical potentials. DOI: 10.1103/PhysRevLett.87.126401 PACS numbers: 71.45.Lr, 72.15.Nj A periodic modulation of the conduction electron density is commonly observed in low-dimensional conductors [1]. This charge-density-wave (CDW) state is the ground state in various inorganic and organic materials with a chainlike structure, giving rise to remarkable electrical properties [2,3]. A particularly interesting feature of the CDW is its collective transport mode, somewhat similar to superconductivity [4]. Under an applied electric field, CDWs slide along the crystal, giving rise to a strongly nonlinear conductivity. Since even a small amount of disorder pins the CDWs, sliding occurs only when the applied electric field exceeds a certain threshold.In metallic and superconducting devices, reduction of sizes has revealed a variety of new mesoscopic phenomena. For CDW conductors, the mesoscopic regime has only been studied for small transverse dimensions [5][6][7] because samples of (sub)micron sizes in the chain direction could not be fabricated in a controlled way. Consequently, many aspects of microscopic CDW dynamics are still unknown. Nevertheless, some early studies on a micronscale revealed interesting mesoscopic features related to the CDW phase distribution [8,9]. More recently, artificial submicron CDW devices have been fabricated [10,11].In this paper, we present current-voltage (IV ) characteristics recorded on high-quality NbSe 3 and TaS 3 crystals with probe spacings in the submicron range (see the inset of Fig. 1). On these short length scales, IV curves vary strongly from segment to segment. For some segments the absolute resistance becomes negative, indicating that the moving CDW pumps single-particle carriers in a direction opposite to that of the rest of the sample. Our results show that the micron scale is the typical length scale for this new phenomenon in CDW dynamics.Experiments were carried out on single NbSe 3 and o-TaS 3 crystals with cross sections of 0.2 to 1 mm 2 . Both materials have a very anisotropic, chainlike structure [2]. NbSe 3 exhibits CDW transitions at T P1 145 K and T P2 59 K. At low temperatures a small portion of the conduction electrons remains uncondensed, providing a metallic single-particle channel. In contrast, in o-TaS 3 all electrons condense into the CDW state. As a result, the linear resistance shows semiconducting behavior below the transition temperature of 220 K.A common technique to contact small CDW whiskers consists of putting the crystals on top of metal probes that are evapor...

show abstract

Negative Differential Resistance and Instability in NbSe3

Cited by 31 publications

References 14 publications

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

Current controlled negative differential resistance behavior in Co2FeO2BO3 and Fe3O2BO3 single crystals

Negative Resistance and Local Charge-Density-Wave Dynamics

Contact Info

Product

Resources

About