On the existence of long-wavelength shear-horizontal surface waves on the bcc (001) surface

Long-wavelength, low-frequency shear-horizontal surface waves are found to exist along 〈100〉, but not 〈110〉, directions of propagation on the (001) face for a simple but fairly realistic model of monatomic body-centered cubic crystals. This domain of existence contrasts with that found previously on the (001) face of monatomic simple cubic and both monatomic and rocksalt face-centered cubic structures, where such waves exist along 〈110〉, but not 〈100〉.