Ultrafast melting of charge ordering in LuFe2O4 probed by terahertz spectroscopy

Itoh, Hirotake; Itoh, K.; Anjyo, K.; Nakaya, H.; Akahama, Hiroshi; Ohishi, Daisuke; Saito, Shingo; Kambe, Takashi; Ishihara, Shu; Ikeda, Naoshi; Iwai, Shinichiro

doi:10.1016/j.jlumin.2011.12.051

Cited by 13 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10c). A CO unaffected by static (melting of the CO by 1.55 eV photons was demonstrated by a re-cent pump-probe experiment [80]) electric fields or currents was also found by in-situ infrared spectroscopy [81], by in-situ x-ray diffraction with the real sample temperature established from the thermal expansion of the silver electrodes [82], and by resonant x-ray diffraction after infield cooling [58]. Although a recent infrared-spectroscopy study [83] suggests very subtle field-effects not attributable to self-heating, the conclusion that a different, possibly ferroelectric, CO cannot be stabilized by electric fields is unavoidable.…”

Section: Electric-field and Current Effects On Comentioning

confidence: 96%

Ferroelectricity from iron valence ordering in rare earth ferrites?

Angst

2013

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

The possibility of multiferroicity arising from charge ordering in LuFe2O4 and structurally related rare earth ferrites is reviewed. Recent experimental work on macroscopic indications of ferroelectricity and microscopic determination of coupled spin and charge order indicates that this scenario does not hold. Understanding the origin of the experimentally observed charge and spin order will require further theoretical work. Other aspects of recent research in these materials, such as geometrical frustration effects, possible electric-field-induced transitions, or orbital order are also briefly treated.Comment: 18 pages, 16 figures; invited Review@RRL, published version has many figures in significantly higher quality; early view accessible via DOI, assigned to issue

show abstract

Section: Electric-field and Current Effects On Comentioning

confidence: 96%

Ferroelectricity from iron valence ordering in rare earth ferrites?

Angst

2013

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…In 2005, a novel type of ferroelectric material was proposed in which the spontaneous polarization mainly originates from the polar ordering of electrons rather than ionic atoms. Such materials are called “electronic ferroelectrics” 4 , 5 and are expected to exhibit unique ferroelectric characteristics such as a low coercive field, excellent durability, and an ultrafast response 6 . In general, the kinetic energy required for an electron system is less than that for a phonon system.…”

Section: Introductionmentioning

confidence: 99%

Direct evidence of electronic ferroelectricity in YbFe2O4 using neutron diffraction and nonlinear spectroscopy

Fujiwara

Fukada

Okuda

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

We report the first observation of room temperature spontaneous electric polarization in an electronic ferroelectric material, a YbFe2O4 single crystal. The observation was based on second harmonic generation (SHG), a nonlinear optical process. Tensor analysis of the SHG signal revealed that this material has a polar charge superstructure with Cm symmetry. This result settles the long-term discussion on the uncertainty about electronic ferroelectric properties, including the charge order structure. We present a complete picture of the polar charge ordering of this material via consistent results from two different characterization methods. The SHG signal shows the same temperature dependence as the superlattice signal observed in neutron diffraction experiments. These results prove ferroelectric coupling to electron ordering in YbFe2O4, which results in electronic ferroelectricity which is enabled by the real space ordering of iron cations with different valences. The existence of electronic ferroelectricity holds promise for future electronics technologies where devices run a thousand times faster than frequency of the present CPU (a few gigahertz) embedded in smartphones, etc.

show abstract

“…10 The charge order can melt and reconstruct in pico seconds order according to the pump probe experiments. 11 Furthermore, the melting of the charge order provokes non-linear electric conductivity which can be used as a switching device. 12 RFe 2 O 4 also shows interesting magnetic property.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

MSEIJ

View full text Add to dashboard Cite

Rare earth ion ferrite RFe 2 O 4 (R = Y, Dy, Ho, Er, Tm, Yb, Lu, Sc, or In) has been attracted much attention due to its anomal physical properties as a candidate of electronic ferroelectric. Although most of reports were discussed by bulk sample, much effort has been made in fabricating film of RFe 2 O 4 recently. Finally the charge order was directly observed just recently. Also some data indicate the spin-charge-orbital coupling. In this paper, the film growth and electric, magnetic and optical properties of the films are briefly reviewed.

show abstract

Ultrafast melting of charge ordering in LuFe2O4 probed by terahertz spectroscopy

Cited by 13 publications

References 9 publications

Ferroelectricity from iron valence ordering in rare earth ferrites?

Ferroelectricity from iron valence ordering in rare earth ferrites?

Direct evidence of electronic ferroelectricity in YbFe2O4 using neutron diffraction and nonlinear spectroscopy

Untitled

Contact Info

Product

Resources

About