Influence of Ti doping on the incommensurate charge density wave in 1T-TaS2
| Autor: | Chen, XM, Miller, AJ, Nugroho, C, de la Peña, GA, Joe, YI, Kogar, A, Brock, JD, Geck, J, MacDougall, GJ, Cooper, SL, Fradkin, E, Van Harlingen, DJ, Abbamonte, P |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | PHYSICAL REVIEW B, vol 91, iss 24 Physical Review B, vol 91, iss 24 |
| DOI: | 10.48550/arxiv.1411.6604 |
| Popis: | 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-Ta(1-x)Ti(x)S(2). 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 deg at x=0 to 16.4 deg 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 {\bf 12}, 2220 (1975)] 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. |
| Databáze: | OpenAIRE |
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