Spin excitations of the correlated semiconductor FeSi probed by THz radiation

By direct measurements of the complex optical conductivity $\sigma(\nu)$ of FeSi we have discovered a broad absorption peak centered at frequency $\nu_{0}(4.2 K) \approx 32 cm^{-1}$ that develops at temperatures below 20 K. This feature is caused by spin-polaronic states formed in the middle of the gap in the electronic density of states. We observe the spin excitations between the electronic levels split by the exchange field of $H_{e}=34\pm 6 T$. Spin fluctuations are identified as the main factor determining the formation of the spin polarons and the rich magnetic phase diagram of FeSi.Comment: 5 pages, 4 figure

Reduction of naughty behavior of preschool children by means of play

Upbringing of a naughty child is one of the most important topics in early childhood education. Lots of parents and almost all the kindergartenТs teachers often deal with misbehavior of youngsters. One of the effective means of reducing the symptoms of preschool childrenТs misbehavior is play

Reduction of naughty behavior of preschool children by means of play

Upbringing of a naughty child is one of the most important topics in early childhood education. Lots of parents and almost all the kindergartenТs teachers often deal with misbehavior of youngsters. One of the effective means of reducing the symptoms of preschool childrenТs misbehavior is play