How to load material onto sphere?

I have a cylinder, which when collides with a sphere, it creates another sphere in the scene through javascript.

I can add rigidbody component, but don't know how to change the material of the sphere that is generated...

 function OnCollisionEnter (col : Collision)
 {    
     var hoverForce = 150;
     if(col.gameObject.name == "Sphere")
     {    
            if (col.rigidbody) {
             col.rigidbody.AddForce(Vector3.up * hoverForce, ForceMode.Acceleration);
         }
         var sphereB : GameObject = GameObject.CreatePrimitive(PrimitiveType.Sphere);
         sphereB.AddComponent(Rigidbody);
         sphereB.transform.position = Vector3(0, 5, 0);
         //GetComponent<Renderer>().material = ball_texture;
     }
     
 }

Renderer.material seems to be depreciated, so how would I change it?

Thanks