Fig. 2: Infrared and Raman responses of the cubic, orthorhombic-antipolar, and monoclinic phases of HfO2. | npj Quantum Materials

Fig. 2: Infrared and Raman responses of the cubic, orthorhombic-antipolar, and monoclinic phases of HfO2.

From: Vibrational fingerprints of ferroelectric HfO2

Fig. 2

a Infrared reflectance spectrum of cubic HfO2:20%Y at 7 K. b Raman spectrum of cubic HfO2:20%Y at 4 K. c Infrared reflectance spectrum of o-AP HfO2:11%Y at 7 K. d Raman spectrum of o-AP HfO2:11%Y at 4 K. e Infrared reflectance spectrum of monoclinic HfO2 at 7 K. f Raman spectrum of monoclinic HfO2 at 4 K. The calculated Raman response of pure HfO2 is plotted along with the measured spectrum in green. The theoretical peak positions of the infrared TO and LO modes in pure stablilizr-free HfO2 are marked using vertical upward and downward lines, respectively. Details are available in the Supplementary Information.

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