What is the peculiarity of the compound Yttrium Barium Copper Oxide (YBCO)?

It is a high temperature superconductor

The correct answer is option 2. It is a high-temperature superconductor.

The peculiarity of the compound Yttrium Barium Copper Oxide (YBCO) is: It is a high temperature superconductor.

Yttrium Barium Copper Oxide (YBCO) is a type II superconductor that exhibits superconductivity at relatively high temperatures compared to conventional superconductors. It was one of the first materials to be identified as a high-temperature superconductor, with critical temperatures above the boiling point of liquid nitrogen (77 K or -196°C), making it practical for applications requiring superconductivity at more accessible temperatures. This property has made YBCO and similar high-temperature superconductors significant for various technological applications, such as in power generation, magnetic resonance imaging (MRI), and particle accelerators.