2016/09/07 by К. Н. Болдырев, K. N. Boldyrev, T. N. Stanislavchuk +6 · 13 citations
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Coupling (piping) #Electron #Field (mathematics) #High-pressure geophysics and materials #Magnetic field #Materials science #Paramagnetism #Phonon #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.118.167203
published in Physical Review Letters 118(16), 167203 (American Physical Society) · 5 pages, 4 figures
arxiv created 2016/09/07 · openalex created_date 2016/09/16 · openalex publication_date 2017/04/18 · arxiv updated 2017/04/26 · openalex updated_date 2026/08/06
We report on a new effect caused by the electron-phonon coupling in a stoichiometric rare-earth antiferromagnetic crystal subjected to an external magnetic field, namely, the appearance of a nonzero gap in the spectrum of electronic excitations in an arbitrarily small field. The effect was registered in the low-temperature far-infrared (terahertz) reflection spectra of an easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bext∥c. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T, and two bifurcation points were observed. We show that the field behavior of the coupled modes can be successfully explained and modeled on the basis of the equation derived in the framework of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8 cm-1.