Detection of x rays by a surface acoustic delay line in contact with a diamond crystal. - Topaltzikis, Dimitrios; Wielunski, Marek; Hörner, Andreas L.; Küß, Matthias; Reiner, Alexander; Grünwald, Theodor; Schreck, Matthias; Wixforth, Achim; Rühm, Werner (Applied Physics Letters, 2021)