How to load material?

Unity Engine
1

Hello, I have a group of gameObjects (cubes) and I have script for this group (not for every cube). And I need save material of every item in this group to the variable. But I dont know how.
Please can you help me?
Thank you very much

2

Are you trying to get the instance of material?

If so use this: renderer.material

3

yes, but if I tryed this:

I get this error:

Problem is, I use script at group of objects. Not for every under group object

4

Use Resources.Load() to load and apply material to an Object!

5 
private Material simpleMat;

void Start()
{
    simpleMat = this.renderer.material;
}