Abstract
By the study of the spectrum of collective modes in a pure d-wave state and in a mixed dx2y2 + idxy state of high-temperature superconductors, we show that in spite of the fact that spectra in both pure states dx2y2 and dxy are identical, the spectrum in the mixture dx2y2 + idxy state turns out to be quite different from them. Thus, the probe of the spectrum in ultrasound and/or microwave absorption experiments could be used to distinguish a mixture of two d-wave states from pure d-wave states.
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