Effect of Pressure on Magneto-Transport Properties in the Superconducting and Normal Phases of the Metallic Double Chain Compound Pr₂Ba₄Cu₇O_15−δ

Abstract

To examine the electronic phase diagram of superconducting CuO double chains, we report the effect of external pressure on the magneto-transport properties in superconducting and nonsuperconducting polycrystalline samples of Pr2Ba4Cu7O 15−δ at low temperatures (1.8-40 K) under various magnetic fields (up to 14 T). In the as-sintered non-superconducting sample, the magnetoresistance (MR) follows a power law of H 3/2 at low temperatures, which is in no agreement with the H 2 dependence of MR in the PrBa2Cu4O8 system. The negative pressure dependence of the superconducting phase is qualitatively consistent with a theoretical prediction on the basis of the Tomonaga-Luttinger Liquid theory. The 48-h-reduced superconducting sample at ambient pressure exhibits no clear increase in MR for T > Tc,on = 26.5 K. In contrast, with the application of pressure to the superconducting sample, the MR effects reappear and are also well fitted by H 3/2 . The model of slightly warped Fermi surfaces explains not only the MR effect of the non-superconducting sample, but is also related to the reasons for the pressure-induced MR phenomena of the superconducting sample.

Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films

“…The multiple CuO chains in the YBCO-125 and YBCO-126 phases offer new opportunities for investigating the rich physics of the CuO chains in Y-Ba-Cu-O. First, a comparative study of these multi-chain phases will shed further light on the proximity-induced pairing in the CuO chains [37], and also help to clarify whether the quasi-1D ribbons formed by these chains can sustain pairing on their own [38][39][40]. Second, the multiple CuO chains may be used to tune the coupling strength between the CuO 2 planes [41], which is known to affect the T c in cuprates [42][43][44][45][46].…”

Enhanced superconducting properties of double-chain based superconductor Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-δ}$ synthesized by citrate pyrolysis technique

“…We also reported the effect of pressure on magneto-transport properties in the superconducting and normal phases of the metallic double chain compound Pr 2 Ba 4 Cu 7 O 15−δ . 13 .…”