Transition between Two Ferromagnetic States Driven by Orbital Ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.88</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.12</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></m

Endoh, Y.; Hirota, K.; Ishihara, Sumio; Okamoto, Satoshi; Murakami, Youichi; Nishizawa, Akinori; Fukuda, Tatsuo; Kimura, Hiroyuki; Nojiri, Hiroyuki; Kaneko, Koji; Maekawa, Sadamichi

doi:10.1103/physrevlett.82.4328

Cited by 264 publications

(186 citation statements)

References 24 publications

Supporting

Mentioning

175

Contrasting

Order By: Relevance

“…7 It is thus no surprise that most orbital order in the manganites exhibits some form of "lock-in" with the crystal lattice, [8][9][10][11][12] or with concomitant charge-ordering patterns. [13][14][15][16] In the latter case the Mn ions segregate themselves into 3+ and 4+ valence states, and because orbital order pertains only to the Mn 3+ sub-lattice, the ordering pattern develops on top of the charge order, usually in a commensurate fashion, even though the charge order itself may not be commensurate with the undistorted crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Yuan

Duan

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

We report inelastic light scattering measurements of lattice dynamics related to the incommensurate orbital order in CaMn7O12. Below the ordering temperature To ≈ 250 K, we observe extra phonon peaks as a result of Brillouin-zone folding, as well as a soft vibrational mode with a powerlaw T -dependent energy, Ω = Ω0(1 − T /To) 1/2 . This temperature dependence demonstrates the second-order nature of the transition at To, and it indicates that the soft mode can be regarded as the amplitude excitation of the composite order parameter. Our result strongly suggests that the lattice degrees of freedom are actively involved in the orbital-ordering mechanism.

show abstract

Section: Introductionmentioning

confidence: 99%

Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Yuan

Duan

et al. 2014

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The x-T phase diagram of low-doped ͑x Ͻ 0.175͒ La 1−x Sr x MnO 3 exhibits several structural and magnetic transitions, 16 with a much debated ground state. [17][18][19][20] Recent reports seem to agree that OO is responsible for the insulating behavior of La 0.9 Sr 0.1 MnO 3 despite its ferromagnetism. 21,22 The character of the different phase transitions in manganites is an important point of debate.…”

mentioning

confidence: 99%

Colossal electroresistance without colossal magnetoresistance in La0.9Sr0.1MnO3

Biškup

Andrés

Nemes

et al. 2007

Applied Physics Letters

View full text Add to dashboard Cite

The authors report on colossal electroresistance ͑ER͒ in the ferromagnetic insulator manganite La 0.9 Sr 0.1 MnO 3 . The single crystal samples exhibit a transition into a low resistive state above a certain threshold current. Pulsed measurements demonstrate that this transition is not a consequence of heating. ER behaves similarly to magnetoresistance ͑MR͒ above the orbital order temperature T OO . Below T OO the MR is only 20% while ER enhances the conductivity by several orders of magnitude. Magnetic field and electric current have opposite effects on the conductivity, therefore, it seems that only the injected carriers are able to modify the ordering of e g Mn orbitals. © 2007 American Institute of Physics. ͓DOI: 10.1063/1.2745220͔ Materials and composites based on mixed manganese oxides ͑manganites͒ R 1−x A x MnO 3 ͑R = La, Pr; A = Ca, Sr͒ are prospect candidates for electronic and/or magnetic devices. Their potential for application is based on coupling of charge and spin orders of freedom. The well studied phenomenon in manganites is magnetoresistance ͑MR͒, the magnitude of which ranges from "giant" 10%-20% to colossal 10 8 % in charge ordered Pr 1−x Ca x MnO 3 , x = 0.3-0.5. 1 Recently, a more debated phenomenon is electroresistance ͑ER͒, i.e., nonlinear current-voltage ͑I-V͒ characteristics. Similar to MR, the magnitude of ER varies in different compounds, reaching equally colossal values in Pr 0.7 Ca 0.3 MnO 3 . 2 ER and MR are coupled, i.e., the voltage/current necessary to trigger insulator-metal transition decreases with magnetic field. Since this initial report in 1997, a significant number of publications report nonlinear I-V effects in manganites. Initially, investigations were limited to materials with charge order ͑CO͒ ground state. Different interpretations for these nonlinearities included depinning of CO state, 3 depinning of charge density waves, 4 or change in the orientation of orbital ordering ͑OO͒. 5,6 Indeed, nonlinear effects were subsequently found in materials without CO,7,8 undermining the interpretation of "melting" of CO/OO states.Recent reports tend to interpret the nonlinear I-V characteristics in manganites as the consequence of Joule heating due to large currents. [9][10][11] In the case of resistive curves with a maximum in R͑T͒, current localization on conductive paths and self-heating was suggested to explain the concomitant increase and decrease of resistance with increasing current. 12,13 However, abrupt switches between high and low resistive states are also found in systems where heating cannot explain the increase of resistance with increasing current. 14 To elucidate the relationship of CO/OO order, magnetism, heating, and I-V nonlinearities in manganites, we have studied La 0.9 Sr 0.1 MnO 3 , a system that is a ferromagnetic insulator with charge/orbital ordering. 15 The parent compound LaMnO 3 is a paramagnetic insulator that at T Ͻ 140 K orders antiferromagnetically. By hole doping ͑by divalent ions such as Sr 2+ ͒ it is possible to change the ground state from i...

show abstract

“…The physics controlling the properties of low-doped manganites is a subject of intense research currently, due to the fact that magnetic ground state of these compounds continues to be a subject of controversy 1,2,3, 4,5,6,7,8,9,10 . The physical properties exhibited by these compounds are likely to be proximate to those of other low doped transition metal oxides, like cuprates and nickelates.…”

Section: Introductionmentioning

confidence: 99%

Changeover from glassy ferromagnetism of the orbital domain state to long-range ferromagnetic ordering inLa0.9Sr0.1MnO3

Mukherjee

Banerjee

2008

Phys. Rev. B

View full text Add to dashboard Cite

An attempt is made to resolve the controversy related to the low temperature phase (ground state) of the low-doped ferromagnetic (FM)-insulator(I) manganite through bulk magnetic measurements on La0.9Sr0.1MnO3 sample. It is shown that the FM phase, formed out of well defined transition in the low-doped system, becomes inhomogeneous with decrease in temperature. This inhomogeniety is considered to be an outcome of the formation of orbital domain state of eg-electrons having hole rich (metallic) walls separating the hole deficient (insulating) regions. The resulting complexity brings in metastability and glassy behaviour within the FM phase at low temperature, however, with no resemblance to spin glass, cluster glass or reentrant phases. It shows ageing effect without memory but magnetic relaxation shows signatures of inter-cluster interaction. The energy landscape picture of this glassy phase is described in terms of hierarchical model. Further, it is shown that this inhomogeneity disappear in La0.9Sr0.1MnO3.08 where, the orbital domain state is destroyed by self doping resulting in reduction of Mn 3+ and hence eg-electrons. The ferromagnetic phase of the nonstoichiometric sample, does not show glassy behaviour. It neither follows 'hierarchical model' nor 'droplet model' generally used to explain glassy or inhomogeneous systems. Its magnetic response can be explained simply from the domain wall dynamics of otherwise homogeneous ferromagnet.

show abstract

Transition between Two Ferromagnetic States Driven by Orbital Ordering inLa0.88Sr0.12MnO

Cited by 264 publications

References 24 publications

Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Soft vibrational mode associated with incommensurate orbital order in multiferroicCaMn7O12

Colossal electroresistance without colossal magnetoresistance in La0.9Sr0.1MnO3

Changeover from glassy ferromagnetism of the orbital domain state to long-range ferromagnetic ordering inLa0.9Sr0.1MnO3

Contact Info

Product

Resources

About