21 research outputs found
Frozen superparaelectric state of the local polar domains in GdMn2O5 and Gd0.8Ce0.2Mn2O5
This work was supported by RFBR (Grant N 18-32-00241)
Electric polarization induced by phase separation domains in multiferroics of RMn2O5 (R = Gd, Bi)
This work was supported by RFBR (Grant N 18-32-00241)
Electric polarization induced by phase separation in magnetically ordered and paramagnetic states of GdMn2O5, BiMn2O5
ΠΠΎΠ»ΡΡΠΈΠ·Π°ΡΠΈΡ Π±ΡΠ»Π° ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½Π° Π² ΠΌΡΠ»ΡΡΠΈΡΠ΅ΡΡΠΎΠΈΠΊΠ°Ρ
RMn2O5 Π² ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π΅ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡ ΠΎΡ 5K Π΄ΠΎ 330K. Π‘Π΅Π³Π½Π΅ΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π΄Π°Π»ΡΠ½ΠΈΠΉ ΠΏΠΎΡΡΠ΄ΠΎΠΊ, ΠΈΠΌΠ΅ΡΡΠΈΠΉ ΠΎΠ±ΠΌΠ΅Π½Π½ΠΎ ΡΡΡΠΈΠΊΡΠΈΠΎΠ½Π½ΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ ΠΏΡΠΈΡΠΎΠ΄Ρ, Π½Π°Π±Π»ΡΠ΄Π°Π»ΡΡ Π² RMn2O5 ΡΠΎΠ»ΡΠΊΠΎ Π½ΠΈΠΆΠ΅ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠΏΠΎΡΡΠ΄ΠΎΡΠ΅Π½ΠΈΡ (TN = 35 β 40 K). ΠΡ ΡΡΠΈΡΠ°Π΅ΠΌ, ΡΡΠΎ Π½Π°Π±Π»ΡΠ΄Π°Π΅ΠΌΠ°Ρ ΠΏΠΎΠ»ΡΡΠΈΠ·Π°ΡΠΈΡ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π° Π·Π°ΠΌΠΎΡΠΎΠΆΠ΅Π½Π½ΡΠΌ ΡΡΠΏΠ΅ΡΠΏΠ°ΡΠ°ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ΠΌ, ΠΊΠΎΡΠΎΡΠΎΠ΅ ΡΠΎΡΠΌΠΈΡΡΠ΅ΡΡΡ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈ ΡΠ°Π²Π½ΠΎΠ²Π΅ΡΠ½ΡΠΌΠΈ Π»ΠΎΠΊΠ°Π»ΡΠ½ΡΠΌΠΈ ΠΏΠΎΠ»ΡΡΠ½ΡΠΌΠΈ ΠΎΠ±Π»Π°ΡΡΡΠΌΠΈ ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ»ΠΎΠ΅Π½ΠΈΡ.The polarization were revealed in multiferroics RMn2O5 at wide temperature interval (5 K - 330 K). The long-range ferroelectric order having an exchange-striction magnetic nature had been o served at low temperatures (Tβ€ TC = 30 - 35 K). We believe that the polarization we observed was caused by the frozen superparaelectric state, which was formed by the restricted polar domains resulting from phase separation and charge carriers self-organization