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P. Starowicz, C. Battaglia, F. Clerc, A. Prodan, L. Despont, H.J.P. van Midden, A. Szytula, M.G. Garnier, and P. Aebi
ZrTe3 is a layered compound exhibiting one-dimensional features both in crystallographic and electronic structure. It undergoes a transition to a charge density wave (CDW) state at 63K [1] and to filamentary superconductivity at 2 K [2]. High pressure studies revealed that for 1 GPa to 4 GPa superconductivity is suppressed while CDWs have higher transition temperature [3]. For pressures higher than 5 GPa CDWs disappear and superconductivity reappears. To study a mechanism of the observed phenomena angle resolved photoelectron spectroscopy (ARPES) and density functional theory were employed [4]. Fermi surface (FS) and band structure along important crystallographic directions were determined experimentally by ARPES and theoretically by using the full potential augmented plane waves and local orbitals method. A pseudogap related to the CDW starts to open at 250 K, but does not transform into a full gap even below the transition temperature, what confirms general ideas from a previous report [5]. The low temperature pseudogap is interpreted as originating from two overlapping FS crossings, among which only one is gapped. FS was also calculated for a series of simulated high-pressure crystal structures, for pressures up to 8 GPa. The results were confronted with the high pressure studies from literature [3]. To analyze the nesting properties static susceptibility was calculated for the FSs as a function of pressure. The results suggest that the size of the nested area is likely to be correlated with the transition temperature to CDW state. The variation of the nested area should suppress or enhance the CDW and it has an opposite impact on superconductivity. [1] D. J. Eaglesham, J. W. Steeds, J. A. Wilson, J. Phys. C: Solid State Phys. 17 (1984) L697. [2] H. Nakajima, K. Nomura, T. Sambongi, Physica B 143 (1986) 240. [3] R. Yomo, K. Yamaya, M. Abliz, M. Hedo, Y. Uwatoko, Phys. Rev. B 71 (2005) 132508. [4] P. Starowicz, C. Battaglia, F. Clerc, L. Despont, A. Prodan, H.J.P. van Midden, U. Szerer, A. Szytula, M.G. Garnier, P. Aebi, Journal of Alloys and Compounds 2007 - in print. [5] T. Yokoya, T. Kiss, A. Chainani, S. Shin and K. Yamaya, Phys. Rev. B 71 (2005) 140504 |
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