Pressure effects on charge-ordering transitions in Perovskite manganites

1997 ◽  
Vol 55 (12) ◽  
pp. 7549-7556 ◽  
Author(s):  
Y. Moritomo ◽  
H. Kuwahara ◽  
Y. Tomioka ◽  
Y. Tokura
Keyword(s):  
Charge Ordering ◽  
Pressure Effects ◽  
Perovskite Manganites ◽  
Ordering Transitions

scholarly journals Imaging the formation and surface phase separation of the CE phase

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Haibiao Zhou ◽  
Qiyuan Feng ◽  
Yubin Hou ◽  
Masao Nakamura ◽  
Yoshinori Tokura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Charge Ordering ◽  
Zero Magnetic Field ◽  
Ferromagnetic Phase ◽  
Emergent Properties ◽  
Orbital Ordering ◽  
Strong Electron ◽  
Antiferromagnetic Correlation ◽  
Ordering Transitions

AbstractThe CE phase is an extraordinary phase exhibiting the simultaneous spin, charge, and orbital ordering due to strong electron correlation. It is an ideal platform to investigate the role of the multiple orderings in the phase transitions and discover emergent properties. Here, we use a cryogenic high-field magnetic force microscope to image the phase transitions and properties of the CE phase in a Pr0.5Ca0.5MnO3 thin film. In a high magnetic field, we observed a clear suppression of magnetic susceptibility at the charge-ordering insulator transition temperature (TCOI), whereas, at the Néel temperature (TN), no significant change is observed. This observation favors the scenario of strong antiferromagnetic correlation developed below TCOI but raises questions about the Zener polaron paramagnetic phase picture. Besides, we discoverd a phase-separated surface state in the CE phase regime. Ferromagnetic phase domains residing at the surface already exist in zero magnetic field and show ultra-high magnetic anisotropy. Our results provide microscopic insights into the unconventional spin- and charge-ordering transitions and revealed essential attributes of the CE phase, highlighting unusual behaviors when multiple electronic orderings are involved.

Pressure Effects on Transport Properties of (La0.85Sr0.15)yMnO3 Single Crystals

2015 ◽  
Vol 233-234 ◽  
pp. 273-276
Author(s):  
Aleksandr Shakin ◽  
Denis Abashev ◽  
Dmitry Shulyatev ◽  
Roman Privezentsev ◽  
Nikolay Andreev ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Transport Properties ◽  
Single Crystals ◽  
Vacancy Concentration ◽  
Charge Ordering ◽  
Pressure Effects ◽  
External Hydrostatic Pressure ◽  
Insulator Metal Transition ◽  
Mn Concentration

We have studied single crystals with same La/Sr ratio but different initial Mn concentration, namely (La0.85Sr0.15)0.93MnO3and (La0.85Sr0.15)0.97MnO3. We have observed, that the temperature of insulator-metal transition TIMincreases for both samples and the temperature of charge ordering TCOincreases for (La0.85Sr0.15)0.93MnO3and decreases for (La0.85Sr0.15)0.97MnO3with the external hydrostatic pressure in the range of 0.1 MPa - 1.3 GPa. After analysis of obtained dependence, we have concluded that (La0.85Sr0.15)0.97MnO3sample has higher concentration of Mn vacancy. Thereby we suppose that growth of Mn vacancy concentration decreases transfer interaction of the conducting electrons and enhances charge ordering of Mn3+and Mn4+ions.

Effects of Magnetic Field on Charge-Ordering Transitions in La 2 CuO 4.08 and Pr 0.5 Sr 0.5 MnO 3

2003 ◽  
Vol 20 (5) ◽  
pp. 738-741 ◽  
Author(s):  
Li Jian-Qi ◽  
Chen Ling ◽  
Yu Hong-Chun ◽  
Y Matsui ◽  
Zhao Zhong-Xian
Keyword(s):  
Magnetic Field ◽  
Charge Ordering ◽  
Ordering Transitions

A “checkerboard” orbital-stripe phase and charge ordering transitions in Pr(Sr x Ca 2 - x )Mn 2 O 7 (0 ⩽ x ⩽ 0.45)

2009 ◽  
Vol 86 (6) ◽  
pp. 67010 ◽  
Author(s):  
Z. A. Li ◽  
X. Li ◽  
Z. Wang ◽  
H. F. Tian ◽  
C. Ma ◽  
...  
Keyword(s):  
Charge Ordering ◽  
Stripe Phase ◽  
Ordering Transitions

Probing the underlying charge ordering: Ruthenium-doped Sm1−xSrxMnO3 perovskite manganites

2001 ◽  
Vol 89 (4) ◽  
pp. 2232-2236 ◽  
Author(s):  
A. Maignan ◽  
C. Martin ◽  
M. Hervieu ◽  
B. Raveau ◽  
J. Hejtmanek
Keyword(s):  
Charge Ordering ◽  
Perovskite Manganites

STUDY OF NÉEL TEMPERATURE AND MULTIPLE PHASE COEXISTENCE IN Bi0.5Ca0.5-xBaxMnO3 (x = 0–0.10)

2012 ◽  
Vol 26 (08) ◽  
pp. 1250049
Author(s):  
RENWEN LI ◽  
LI PI ◽  
WEI TONG ◽  
LEI ZHANG ◽  
LANGSHENG LING ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Ordering ◽  
Magnetic Data ◽  
Perovskite Manganites ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Multiple Phase ◽  
Magnetic Analysis ◽  
Structural And Magnetic Properties ◽  
Lower Temperature

Structural and magnetic properties of Bi0.5 Ca0.5-xBaxMnO3 (x = 0, 0.03, 0.05, 0.07 and 0.10) samples with charge ordering (CO) state and C-type antiferromagnetic (AFM) magnetic structure have been studied systematically. With increasing Ba-doping level, both CO and AFM are weakened. From the micro-magnetic analysis, we clarify the ambiguity about the Néel temperature TN in bismuth-based perovskite manganites. We find that the paramagnetic (PM)-CO/AFM transition temperature TCO at high temperature is the onset temperature of the PM–AFM transition, while customarily so-called TN at low temperature indicates the finish of the PM–AFM transition. Both the macro- and micro-magnetic data show that, in all the samples, only AFM state coexists with PM matrix below CO transition and above TN, while AFM state coexists with ferromagnetic (FM) state and PM state at lower temperature below TN.

scholarly journals Structural and Magnetic States in Layered Manganites: An Expanding View of the Phase Diagram

1999 ◽  
Vol 602 ◽  
Author(s):  
J.F. Mitchell ◽  
J.E. Millburn ◽  
C. Ling ◽  
D.N. Argyriou ◽  
H. N. Bordallo
Keyword(s):  
Degrees Of Freedom ◽  
Hole Concentration ◽  
Charge Ordering ◽  
Perovskite Manganites ◽  
Electronic Interactions ◽  
Colossal Magnetoresistive ◽  
Reduced Dimensions ◽  
Incommensurate Magnetic Structure ◽  
Extreme Sensitivity ◽  
Magnetic States

AbstractColossal magnetoresistive (CMR) manganites display a spectacular range of structural, magnetic, and electronic phases as a function of hole concentration, temperature, magnetic field, etc. Although the bulk of research has concentrated on the 3-D perovskite manganites, the ability to study anisotropic magnetic and electronic interactions made available in reduced dimensions has accelerated interest in the layered Ruddlesden-Popper (R-P) phases of the manganite class. The quest for understanding the coupling among lattice, spin, and electronic degrees of freedom (and dimensionality) is driven by the availability of high quality materials. In this talk, we will present recent results on synthesis and magnetic properties of layered manganites from the La2−2xSr1+2xMn2O7 series in the Mn4+-rich regime x > 0.5. This region of the composition diagram is populated by antiferromagnetic structures that evolve from the A-type layered order to G-type “rocksalt” order as x increases. Between these two regimes is a wide region (0.7 < x < 0.9) where an incommensurate magnetic structure is observed. The IC structure joins spin canting and phase separation as a mode for mixed-valent manganites to accommodate FM/AF competition. Transport in these materials is dominated by highly insulating behavior, although a region close to x = 0.5 exhibits metal-nonmetal transitions and an extreme sensitivity to oxygen content. We suggest two possible explanations for this transport behavior at doping just above x=0.5: localization by oxygen defects or charge ordering of Mn3+/Mn4+ sites.

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