Abstract
We report systematic studies of a new quasi-one-dimensional (quasi-1D) compound, Ba3TiTe5, and the high-pressure induced superconductivity therein. Ba3TiTe5 was synthesized at high pressure and high temperature. It crystallizes into a hexagonal structure (P63/mcm), which consists of infinite face-sharing octahedral TiTe6 chains and Te chains along the c axis, exhibiting a strong 1D characteristic structure. The first-principles calculations demonstrate that Ba3TiTe5 is a well-defined 1D conductor; thus, it can be considered a starting point to explore the exotic physics induced by pressure by enhancing the interchain hopping to move the 1D conductor to a high-dimensional metal. For Ba3TiTe5, high-pressure techniques were employed to study the emerging physics dependent on interchain hopping, such as the Umklapp scattering effect, spin/charge density wave (SDW/CDW), superconductivity and non-Fermi liquid behavior. Finally, a complete phase diagram was plotted. The superconductivity emerges at 8.8 GPa, near which the Umklapp gap is mostly suppressed. Tc is enhanced and reaches a maximum of ~6 K at ~36.7 GPa, where the SDW/CDW is completely suppressed, and a non-Fermi liquid behavior appears. Our results suggest that the appearance of superconductivity is associated with the fluctuation due to the suppression of the Umklapp gap and that the enhancement of the Tc is related to the fluctuation of the SDW/CDW.
Highlights
The one-demensional (1D) system has attracted much attention due to its novel physics and unique phenomena, which are dramatically different from those of twodimensional (2D) or three-dimensional (3D) systems[1,2]
Rietveld refinement was performed by adopting the crystal structure of R3TiSb5 (R = La, Ce) as the initial model[30,31], which smoothly converged to χ2 = 2.0, Rp = 3.1% and Rwp = 4.4%
From the partial density of state (PDOS), it can be seen that the density of state (DOS) near the Fermi level is dominated by the 3dorbitals of Ti
Summary
The one-demensional (1D) system has attracted much attention due to its novel physics and unique phenomena, which are dramatically different from those of twodimensional (2D) or three-dimensional (3D) systems[1,2]. When the motion of electrons is confined within one dimension, the electrons cannot move without pushing all the others, which leads to a collective motion and spin-charge separation. Umklapp scattering (U-MIT) and an ordered phase transition, such as charge order, both of which can be gradually suppressed by pressure. While for (TMTSF)2X salts, the enhancement of interchain coupling tb completely suppresses the U-MIT. With the application of pressure, the SDW transition is gradually suppressed, and superconductivity is induced[9,10,11]. When the interchain coupling further increases, such as in (TMTSF)2ClO4, superconductivity appears, with the complete suppression of the SDW12
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