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I really like the Quintet for Strings "Unknown Heavens" by Einojuhani Rautavaara from 1997.

Some of my favorite chamber works are by John Harbison, but they're from the eighties and fall outside of your criteria for contemporary works. Still, things like his string quartets Nos. 1 & 2 are so good that I feel compelled to mention them. This recording is a favorite of mine.

Along the same lines I can recommend the string quartets of John McCabe, but these works are also from the eighties.

Honestly, I've not been very impressed with chamber music in the last decade or so. Richard Dubugnon released an album on Naxos that was pretty good, but it's just not as compelling as the stuff I previously mentioned.

Oh. I have never used it, but there are some general tips for notating non-standard or extended techniques:

1. Try to get your hands on a book about twentieth century or contemporary notation/composition, and see if there is any codified way to notate the specific technique. Or,
   
   
2. Give the note some sort of articulation, like an accent or marcato (housetop), and then write what you want to happen above the note. (In English, if no other language is the standard.)
   
   For your example, I would just give the note a marcato accent and write "Scratch-tone" above it. Just try to be as clear as possible. Down the road, if a string player or someone knows of a better way for the notation, be receptive of their advice and change it.