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Table 2 Ranges of existence of PSP in ZnGeP2

From: Dispersion of Phonon Surface Polaritons in ZnGeP2: Anisotropy and Temperature Impacts

  C||x C||y C||z
SPP 1   4 K  
ν = 404 ÷ 406 cm−1 ν = 329 ÷ 332 cm−1 ν = 400 ÷ 403 cm−1
  ν = 369 ÷ 374 cm−1  
ν = 386 ÷ 401 cm−1
  300 K  
ν = 400 ÷ 403 cm−1 ν = 327 ÷ 331 cm−1 ν = 404 ÷ 406 cm−1
  ν = 371 ÷ 376 cm−1  
ν = 390 ÷ 404 cm−1
SPP 2   4 K  
ν = 344 ÷ 363 cm−1   ν = 201 ÷ 203 cm−1
ν = 406 ÷ 409 cm−1 ν = 327 ÷ 331 cm−1
ν = 369 ÷ 374 cm−1
ν = 386 ÷ 399 cm−1
  300 K  
ν = 342 ÷ 360 cm−1   ν = 204 ÷ 205 cm−1
ν = 408 ÷ 412 cm−1 ν = 329 ÷ 333 cm−1
ν = 371 ÷ 377 cm−1
ν = 390 ÷ 403 cm−1