Phase separation near the charge neutrality point in FeSe$_{1-x}$Te$_{x}$ crystals with x $<$ 0.15

Y. A. Ovchenkov; D. A. Chareev; E. S. Kozlyakova; E. E. Levin; M. G. Miheev; D. E. Presnov; A. S. Trifonov; O. S. Volkova; A. N. Vasiliev

doi:10.1088/1361-6668/ac3e55

paper

Phase separation near the charge neutrality point in FeSe $_{1 - x}$ Te $_{x}$ crystals with x $<$ 0.15

arXiv:2107.04793 · doi:10.1088/1361-6668/ac3e55

Abstract

Our study of FeSe $_{1 - x}$ Te $_{x}$ crystals with x $<$ 0.15 shows that the phase separation in these compositions occurs into phases with a different stoichiometry of iron. This phase separation may indicate structural instability of the iron plane in the studied range of compositions. To explain it, we discuss the bond polarity and the peculiarity of the direct $d$ exchange in the iron plane in the framework of the basic phenomenological description such as the Bethe-Slater curve. With this approach, when the distance between iron atoms is close to the value at which the sign of the magnetic exchange for some $d$ orbitals changes, structural and electronic instability can occur. Anomalies in the crystal field near the point of charge neutrality can also be a significant component of this instability. A similar instability of the iron plane may also be an important factor for other series of iron-based superconductors.

References in corpus (8)

Cited by in corpus (1)

Resurgence of superconductivity and the role of $d_{x y}$ hole band in FeSe $_{1 - x}$ Te $_{x}$

Phase separation near the charge neutrality point in FeSe1−x​Tex​ crystals with x < 0.15

Abstract

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Cited by in corpus (1)

Phase separation near the charge neutrality point in FeSe $_{1 - x}$ Te $_{x}$ crystals with x $<$ 0.15