Crystal Growth and High-Pressure Effects of Bi-Based Superconducting Whiskers

Abstract

Three growth methods were tested for producing high-transition temperature superconducting Bi${}_2$Sr${}_2$Ca${}_{n-1}$Cu${}_n$O${}_{2n+4+\delta }$ whiskers, employing different ways to focus a compressive stress and size effect of the precursors. First, thermographic imaging was used to investigate thermal stress from temperature distribution in the precursors during growth annealing. To enhance thermal stress in the precursors, a thermal cycling method and an Ag-paste coating method were proposed and found to significantly accelerate the whisker growth. The use of pulverized precursors also promoted whisker growth, possibly due to contribution from the vapor-liquid-solid growth mechanism. The obtained whiskers revealed the typical composition, diffraction patterns, and superconducting properties of the Bi-2212 phase. The proposed methods were able to stably produce longer whiskers compared to the conventional method. Using the obtained whiskers, electrical transport measurements under high pressure were successfully performed at up to around 50 GPa.

References in corpus (10)

• Evolution of the resistivity anisotropy in Bi_{2}Sr_{2-x}La_{x}CuO_{6+δ} single crystals for a wide range of hole doping
• d-like Symmetry of the Order Parameter and Intrinsic Josephson Effects in Bi2212 Cross-Whisker Junctions
• Higher superconducting transition temperature by breaking the universal pressure relation
• Novel Diamond Anvil Cell for Electrical Measurements using Boron-doped Metallic Diamond Electrodes
• Diamond anvil cell using boron-doped diamond electrodes covered with undoped diamond insulating layer
• Growth of R-123 Phase Single Crystal Whiskers
• Large critical current density improvement in Bi-2212 wires through groove-rolling process
• Pressure Effect in Bi-2212 and Bi-2223 Cuprate Superconductor
• Anisotropic evolution of energy gap in Bi2212 superconductor
• Crystal Size Improvement of Bi-based Superconducting Whiskers under Stress-controlled Condition

Cited by in corpus (2)

• Second Dome of Superconductivity in YBa${}_2$Cu${}_3$O${}_7$ at High Pressure
• Radio-Frequency Gasket for Studies of Superconductivity in Diamond Anvil Cells