Characterization of the (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$ single crystals grown under high pressure

Abstract

By using high pressure and high temperature (3.7 GPa, 1120 ${}^{\circ }$C) synthesis technique, we have grown (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$ single crystals. X-ray diffraction, scanning electron microscopy, resistivity and magnetization measurements are carried out and all show that the samples have good quality. The single crystal has onset and zero-resistance transition temperatures of about 111 K and 109.6 K, indicating a very narrow transition width, which is consistent with a rather sharp magnetization transition. Magnetization hysteresis loops (MHLs) are also measured, showing a pronounced second peak effect in the intermediate temperature region. The magnetic critical current density calculated from the MHLs at 77 K and 1.5 T is about 6.4$\times$10${}^4$ A/cm${}^2$. By using a criterion of 1$\%$ normal state resistivity, we have determined the irreversibility line which exhibits an irreversibility field of about 8 T at 77 K. Compared with other layered systems, it is easy to find that the irreversibility line is rather high and could be further improved with the optimized transition temperature of about 118 K as previously discovered in polycrystalline samples.

arXiv comment12 pages, 5 figures. Accepted for publication into Superconductor Science and Technology

References in corpus (6)

• Elastic theory of flux lattices in presence of weak disorder
• Elastic Theory of pinned flux lattices
• Scale-free structural organization of oxygen interstitials in La2CuO4+y
• Thermodynamic origin of the peak effect in the superconductor Nb3Sn
• Unprecedented High Irreversibility Line in Nontoxic Cuprate Superconductor (Cu,C)Ba2Ca3Cu4O11+delta
• No Ending Point in The Bragg-to-Vortex Glass Phase Transition Line at Low Temperatures

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• Strong-coupling superconductivity and weak vortex pinning in Ta-doped CsV${}_3$Sb${}_5$ single crystals
• Quantifying the nonadiabaticity strength constant in recently discovered highly-compressed superconductors
• Superconducting thin films of (Cu,C)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{9+\delta }$ with zero resistance transition temperature close to 100 K
• Growth of (Cu,C)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{9\pm \delta }$ thin films on flexible Hastelloy tapes
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$