Observation of two charge ordering transitions in the valence-fluctuating EuPtP by resonant x-ray diffraction

2010 ◽  
Vol 82 (19) ◽  
Author(s):  
T. Inami ◽  
S. Michimura ◽  
A. Mitsuda ◽  
H. Wada
Keyword(s):  
Charge Ordering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ordering Transitions

scholarly journals Charge Ordering in α-(BEDT-TTF)2I3by Synchrotron X-ray Diffraction

2007 ◽  
Vol 76 (11) ◽  
pp. 113702 ◽  
Author(s):  
Toru Kakiuchi ◽  
Yusuke Wakabayashi ◽  
Hiroshi Sawa ◽  
Toshihiro Takahashi ◽  
Toshikazu Nakamura
Keyword(s):  
Charge Ordering ◽  
X Ray Diffraction ◽  
X Ray

TEMPERATURE AND X-RAY ILLUMINATION EFFECTS IN OXYGEN DOPED La2CuO4

2003 ◽  
Vol 17 (04n06) ◽  
pp. 836-841 ◽  
Author(s):  
G. CAMPI ◽  
D. DI CASTRO ◽  
C. DELL'OMO ◽  
S. AGRESTINI ◽  
N. L. SAINI ◽  
...  
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Coherence Length ◽  
Charge Ordering ◽  
X Ray Diffraction ◽  
Incident Flux ◽  
X Ray ◽  
Stable Domain ◽  
Photon Dose ◽  
Charge Modulations

We have investigated charge ordering in an oxygen doped La 2 CuO 4.1 crystal by high resolution x-ray diffraction using synchrotron radiation. Thanks to the high brilliance synchrotron radiation it has been possible to record a large number of weak superstructure spots due to charge ordering around the main peaks of the average structure. A study of the charge modulations with stage 3.5, and their behaviour as a function of the temperature and the intensity of the x-ray incident flux is reported. We are able to distinguish a microscopic decomposition in; 1) a stable domain, due to charges self trapped into a crystal of static ordered strings of finite length (~ 145 Å) and; 2) bubbles of 'superstripes' showing, as a function of photon dose, a decreasing coherence length at T = 220 K.

Crystal Structure and Magnetic Ordering Transitions in CeNiIn4, EuNiIn4 and EuCuIn4

2014 ◽  
Vol 69 (9-10) ◽  
pp. 1003-1009 ◽  
Author(s):  
Walter Schnelle ◽  
Reinhard K. Kremer ◽  
Rolf-Dieter Hoffmann ◽  
Ute Ch. Rodewald ◽  
Rainer Pöttgen
Keyword(s):  
Low Temperatures ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Specific Heats ◽  
Antiferromagnetic Ordering ◽  
Arc Melting ◽  
Ordering Transitions ◽  
The Eu

Abstract Polycrystalline CeNiIn4 was prepared by arc-melting of the elements and subsequent annealing at 970 K in vacuum. EuNiIn4 and EuCuIn4 were synthesized from the elements by reactions in sealed tantalum tubes. These indium-rich compounds crystallize with the YNiAl4-type structure which was refined for EuCuIn4 from single-crystal X-ray diffraction data: Cmcm, a=450:04(9), b=1698:7(4), c = 740:2(2) pm, wR2 = 0:0606, 495 F2 values, 24 variables. The EuCuIn4 structure is built up from a complex three-dimensional [CuIn4] polyanion (265 - 279 pm Cu-In and 296 - 331 pm In- In) in which the europium atoms occupy distorted hexagonal channels. The Eu-Eu distances within these channels (450 pm) are significantly shorter than the distances between Eu atoms in neighboring channels (552 pm). The magnetic properties and the specific heats of the europium compounds have been investigated. Both europium compounds show the magnetism of divalent Eu ions and antiferromagnetic ordering at low temperatures. EuCuIn4 is magnetically ordered via a surprisingly complex sequence of three transitions

The Effects of Substrate-Induced Strains on the Charge-Ordering Transition in Nd0.5Sr0.5MnO3 Thin Films

1999 ◽  
Vol 602 ◽  
Author(s):  
W. Prellier ◽  
Amlan Biswas ◽  
M. Rajeswari ◽  
T. Venkatesan ◽  
R.L. Greene
Keyword(s):  
Thin Films ◽  
Variable Temperature ◽  
Charge Ordering ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
Metallic Behavior ◽  
X Ray ◽  
Post Annealing ◽  
Ordering Transition

AbstractWe report the growth and characterization of Nd0.5Sr0.5MnO3 thin films deposited by the Pulsed Laser Deposition (PLD) technique on [100]-oriented LaAlO3 substrates. X-ray diffraction (XRD) studies show that the films are [101]-oriented, with a strained and quasi-relaxed component, the latter increasing with film thickness. A post-annealing under oxygen leads to a quasi-relaxed film with a metallic behavior. We also observe that transport properties are strongly dependent on the thickness of the films. Variable temperature XRD down to 100 K suggests that this is caused by substrate-induced strain on the films.

Charge ordering in Eu3S4 determined by the valence-difference contrast of synchrotron X-ray diffraction

2004 ◽  
Vol 350 (4) ◽  
pp. 353-365 ◽  
Author(s):  
Hiroki Ohara ◽  
Satoshi Sasaki ◽  
Yukiko Konoike ◽  
Takeshi Toyoda ◽  
Kouji Yamawaki ◽  
...  
Keyword(s):  
Charge Ordering ◽  
X Ray Diffraction ◽  
X Ray

X-Ray Induced Insulator-Metal Transitions in CMR Manganites

1997 ◽  
Vol 494 ◽  
Author(s):  
V. Kiryukhin ◽  
D. Casa ◽  
B. Keimer ◽  
J. P. Hill ◽  
A. Vigliante ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Charge Ordering ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Practical Applications ◽  
Transitional State ◽  
Current Voltage ◽  
Highly Nonlinear ◽  
Type Of Transition

ABSTRACTIn this work we report a study of the photoinduced insulator-to-metal transition in manganese oxide perovskites of the formula Pr1-xCaxMnO3. The transition is closely related to the magnetic field induced insulator-to-metal transition (CMR effect) observed in these materials. It is accompanied by a dramatic change in the magnetic properties and lattice structure: the material changes from an insulating charge-ordered canted antiferromagnet to a ferromagnetic metal. We present an investigation of the transport and structural properties of these materials over the course of the transition (which usually takes about an hour to complete). The current-voltage characteristics exhibited by the material during the transition are highly nonlinear, indicating a large inhomogeneity of the transitional state. Possible practical applications of this novel type of transition are briefly discussed. We also report a high-resolution x-ray diffraction study of the charge-ordering in these materials. The temperature dependent charge ordering structure observed in these compounds is more complex than previously reported.

Direct Observation of Charge Ordering in Magnetite Using Resonant Multiwave X-Ray Diffraction

2012 ◽  
Vol 108 (14) ◽  
Author(s):  
Shih-Chang Weng ◽  
Yen-Ru Lee ◽  
Cheng-Gang Chen ◽  
Chia-Hung Chu ◽  
Yun-Liang Soo ◽  
...  
Keyword(s):  
Direct Observation ◽  
Charge Ordering ◽  
X Ray Diffraction ◽  
X Ray
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