Effects of doping on charge-density waves in layer compounds

Salvo, F. J. Di; Wilson, J. A.; Bagley, B. G.; Waszczak, J. V.

doi:10.1103/physrevb.12.2220

Cited by 213 publications

(116 citation statements)

References 24 publications

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“…Samples were prepared in the standard manner 14 by heating mixtures of the corresponding elements with excess sulfur in quartz tubes. The tubes were heated to 1200 K for two weeks followed by a quench to room temperature to obtain the desired 1T -polytype.…”

Section: Resultsmentioning

confidence: 99%

Collective pinning dynamics of charge-density waves in 1T-TaS2

Sandy

Mohanty

et al. 2012

Phys. Rev. B

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Using high-resolution x-ray scattering and x-ray photon correlation spectroscopy (XPCS), we have investigated the structure and dynamics of charge density wave (CDW) dynamics in pure and titanium-doped 1T -TaS2. Time-averaged scattering measurements of pure and doped samples reveal that 1T -TaS2 is a weakly pinned two-dimensional CDW system. Using XPCS, we find that after long anneals the CDW domain structure in the incommensurate phase (IC) is pinned and stable against spontaneous fluctuations thus rejecting phasons as spontaneous excitations in higher-dimensional CDW systems. By examining the dynamics of deeply-quenched samples upon heating, we find that meta-stable CDW configurations collectively re-arrange in a non-equilibrium manner. For nominally pure samples, we determine an energy barrier to relaxation of 4600 K that is considerably greater than that found for lower dimensional CDW's.

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Section: Resultsmentioning

confidence: 99%

Collective pinning dynamics of charge-density waves in 1T-TaS2

Sandy

Mohanty

et al. 2012

Phys. Rev. B

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“…The doping level x = 0.08 was found to be special in that it exhibits a peak in the amplitude of the CDW in the NC phase and the largest anomaly in the (0,0,3) structural Bragg reflection, in addition to the large resistance change previously reported. 11 We argue that these anomalies arise because the CDW is most commensurate with the lattice at x=0.08. ACKNOWLEDGMENTS X-ray experiments were supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-FG02-06ER46285.…”

Section: Discussionmentioning

confidence: 99%

“…The enthalpy change at the transition, ∆H N C , also exhibits a peak at a similar composition 11 . These effects been attributed to cation ordering 8 , which might exhibit a pe- riod of a = √ 0.08 a 0 ∼ a 0 / √ 13 and would stabilize a CDW of the same wave vector.…”

Section: Introductionmentioning

confidence: 93%

“…Hence, unless steps are taken to keep the S content stoichiometric, through the use of precisely controlled S overpressure 12 , the composition should be written Ta 1−x Ti x S 2−δ , where δ is a small number. Even trace quantities of either Ti impurities or S vacancies eliminate the C phase altogether 11,13 . This may be because the additional carriers screen the Coulomb interactions responsible for Mott localization 8 .…”

Section: Introductionmentioning

confidence: 99%

“…The influence of Ti doping was originally studied by DiSalvo 11,22 , where it was shown that Ti substitutes for Ta, hole-doping the system. They also showed that TaS 2 is unstable with respect to the formation of S vacancies, which electron dope the system.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ti doping on the incommensurate charge density wave in1T−TaS2

et al. 2015

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We report temperature-dependent transport and x-ray diffraction measurements of the influence of Ti hole doping on the charge density wave (CDW) in 1T -Ta1−xTixS2. Confirming past studies, we find that even trace impurities eliminate the low-temperature commensurate (C) phase in this system. Surprisingly, the magnitude of the in-plane component of the CDW wave vector in the nearly commensurate (NC) phase does not change significantly with Ti concentration, as might be expected from a changing Fermi surface volume. Instead, the angle of the CDW in the basal plane rotates, from 11.9• at x = 0 to 16.4• at x = 0.12. Ti substitution also leads to an extended region of coexistence between incommensurate (IC) and NC phases, indicating heterogeneous nucleation near the transition. Finally, we explain a resistive anomaly originally observed by DiSalvo [F. J. DiSalvo, et al., Phys. Rev. B 12, 2220] as arising from pinning of the CDW on the crystal lattice. Our study highlights the importance of commensuration effects in the NC phase, particularly at x ∼ 0.08.

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Charge-Density-Wave Domain Originated Altshuler-Aronov-Spivak Effect in 1T-TaS2 Single Crystal

Isa¹,

Sasaki

Wu³

et al. 2002

phys. stat. sol. (b)

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We have performed photo‐induced “transient thermoelectric effect (TTE)” experiments for charge‐density‐wave (CDW) material 1T‐TaS2 single crystals in hexagonal and triclinic nearly commensurate phases up to 5 T. The TTE voltages decay with the characteristic relaxation times τ1, τ2, and τ3. τ1 and τ2 in the hexagonal phase oscillate with magnetic field B, while those in the triclinic phase are independent of B. The oscillatory phenomenon is interpreted by the Altshuler‐Aronov‐Spivak effect around the hexagonal arrays of commensurate CDW domains.

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Effects of doping on charge-density waves in layer compounds

Cited by 213 publications

References 24 publications

Collective pinning dynamics of charge-density waves in 1T-TaS2

Collective pinning dynamics of charge-density waves in 1T-TaS2

Influence of Ti doping on the incommensurate charge density wave in1T−TaS2

Charge-Density-Wave Domain Originated Altshuler-Aronov-Spivak Effect in 1T-TaS2 Single Crystal

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