Optical study of phonons and electronic excitations in tetragonal Sr${}_2$VO${}_4$

Abstract

We report on the optical excitation spectra in Sr${}_2$VO${}_4$. The phonon modes are assigned and their evolution with temperature is discussed in the frame of the different phase transitions crossed upon cooling. Besides the expected infrared-active phonons we observe two additional excitations at about 290 cm${}^{-1}$ and 840 cm${}^{-1}$ which could correspond to electronic transitions of the V${}^{4+}$ ions. Our experimental results are discussed in the context of recent experimental and theoretical studies of this material with a unique spin-orbital ground state.

7 pages, 6 figures

References in corpus (4)

• Electronic Structure of Strongly Correlated Systems Emerging from Combining Path-Integral Renormalization Group with Density Functional Approach
• Magnetically Hidden Order of Kramers Doublets in $d^1$ Systems: Sr${}_2$VO${}_4$
• Optical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations
• Sr${}_2$(Ba${}_2$)VO${}_4$ under pressure -- an orbital switch and potential $d^1$ superconductor

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• Charge transfer across transition metal oxide interfaces: emergent conductance and new electronic structure
• Alternating spin-orbital order in tetragonal Sr2VO4
• Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4
• Jahn-Teller induced nematic orbital order in tetragonal Sr${}_2$VO${}_4$
• Structural anomalies and short-range magnetic correlations in the orbitally degenerated system Sr${}_2$VO${}_4$