I encountered this following sentence in an article.
The upper critical field Hc2(T) is strongly temperature dependent, indicating a multiband superconductivity in this system.
I cannot understand its structure. Is it correct?
There, indicating might be paraphrased, "a fact that indicates" or "which indicates".
It is common for the relative which to refer back to the idea or fact expressed in the matrix clause. Semantically, much the same thing is going on here with the clause introduced by the present participle.
The food critic didn't eat much, which left the chef in doubt whether she liked his cooking.
The food critic didn't eat much, leaving the chef in doubt whether she liked his cooking.
The car ran out of gas, which caused them to arrive late for the movie.
The car ran out of gas, causing them to arrive late for the movie.
The ambassador disagreed publicly with the leader of the country, which made the leader question the ambassador's loyalty.
The ambassador disagreed publicly with the leader of the country, making the leader question the ambassador's loyalty.