Recently discovered superconductivity materials are

Options

A. `M_(3)C_(60)`
B. `YBa_(2)Cu_(3)O_(7)`
C. `SiC`
D. `Hg_(2)Ba_(2)YCaCu_(2)O_(7)`

Answer

To determine which of the recently discovered superconductivity materials are correct from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Superconductivity**:
- Superconductivity is a phenomenon where a material exhibits zero electrical resistance and expulsion of magnetic fields when cooled below a certain critical temperature.

2. **Analyze the Given Options**:
- The options provided are:
- Option 1: M3C16
- Option 2: YBa2Cu3O7
- Option 3: SiC
- Option 4: Hg2Ba2YCu2O7

3. **Evaluate Each Option**:
- **Option 1: M3C16**: This material is known to exhibit superconductivity.
- **Option 2: YBa2Cu3O7**: This compound is a well-known high-temperature superconductor.
- **Option 3: SiC**: Silicon carbide (SiC) is not a superconductor.
- **Option 4: Hg2Ba2YCu2O7**: This compound is also recognized as a superconductor.

4. **Identify the Correct Options**:
- Based on the evaluations:
- Option 1 (M3C16) - Superconductor
- Option 2 (YBa2Cu3O7) - Superconductor
- Option 3 (SiC) - Not a superconductor
- Option 4 (Hg2Ba2YCu2O7) - Superconductor

5. **Conclusion**:
- The correct superconductivity materials from the options provided are:
- Option 1: M3C16
- Option 2: YBa2Cu3O7
- Option 4: Hg2Ba2YCu2O7

### Final Answer:
The recently discovered superconductivity materials are M3C16, YBa2Cu3O7, and Hg2Ba2YCu2O7.

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