• Nie Znaleziono Wyników

HELICAL SCREW-TYPE MAGNETIC STRUCTURE OF THE MULTIFERROICS CaMn

N/A
N/A
Info
Pobierz
Protected

Academic year: 2021

Share "HELICAL SCREW-TYPE MAGNETIC STRUCTURE OF THE MULTIFERROICS CaMn"

Copied!
1
0
0

Ładowanie.... (Zobacz pełny tekst teraz)

Pobierz teraz ( 1 Stron )

Pełen tekst

(1)

ISSRNS 2012: Abstracts / Synchrotron Radiation in Natural Science Vol. 11, No 1 – 2 (2012) P 57

HELICAL SCREW-TYPE MAGNETIC STRUCTURE OF THE MULTIFERROICS CaMn

7

O

12

W. S lawi´nski1∗, R. Przenios lo1, I. Sosnowska1, and V. Petricek2

1Faculty of Physics, University of Warsaw, Ho˙za 69, 00–681 Warsaw, Poland

2Institute of Physics of the Academy of Sciences of the Czech Republic, v.v.i., Na Slovance 2, 182 21 Praha 8, Czech Republic

∗e-mail : wojciech@fuw.edu.pl

The modulated crystal structure and mod- ulated magnetic ordering of the multiferroic CaCuxMn7−xO12 is studied by analysing neu- tron and SR powder diffraction data with a model based on the magnetic superspace group R31’(00γ)ts. Both atomic position modulations and magnetic modulations are described with the modulation vector (0, 0, q). The magnetic ordering is a screw type circular helix where the magnetic moments are perpendicular to the c direction.

The temperature dependence of the modulation vector length and the ordered magnetic mo-

ments of Mn3+ and Mn4+ ions is given between T = 50 K and the N´eel temperature TN = 90 K. The atomic position modulation length Lp

and the magnetic modulation length Lmfulfil the re- lation Lm= 2Lp at all temperatures between 50 K and TN.

References

[1] W. S Lawi´nski, R. Przenioslo, I. Sosnowska, and V.

Petricek, Acta Crystallographica B 2012 (in press).

141

Cytaty

Pobierz teraz ( PDF - 1 Stron - 270.56 KB )

Powiązane dokumenty

Scanning of Magnetic Field as a Method of Investigations of the Structure of Magnetic Materials

Distribution of magnetic field above the strip of electrical steel magnetized by c-yoke system (B – on upper figure): a) result of 3D magnetic field computation (theory), b)

Genre and literacies in the Late Modern period: Historical (socio)pragmatics of the 1820 settler petition

A closer look into the scribal practices in the 1820 settler community presented above allows reaching beyond the question of authorship and whose language the data represents

Correlation between crystal and magnetic structure of the polycrystalline and nanoparticle TbMnO3 manganite

Keywords: crystal structure, exchange interactions, nanoparticle, grain size, Mn−O bond lengths, Mn−O−Mn bond angles, the Jahn-Teller distortion parameter.. S t r e s z c z e n

Improving the Quality of Magnetic Signature Reproduction by Increasing Flexibility of Multi-Dipole Model Structure and Enriching Measurement Information

In the magnetic dipole theory [20], [21], if the magnetic sensor is located far enough from the ferromagnetic object, at a distance three times larger than the largest dimension of

THE DETERMINATION OF MOLECULAR STRUCTURE OF CHLOROANISOLES BY X-RAY DIFFRACTION

The method of reduction proposed by Mozzi- Warren with the modifications introduced by the Drozdowski [1]-[3] applied in analysis of the scat- tered radiation intensity

Structural, electronic and magnetic phase transitions in complex oxide perovskites probed by X-ray synchrotron powder diffraction L

In situ temperature-dependence powder diffraction examinations and analysis of thermal expansion is very useful tool not only for the study of structural phase

The application of X-Ray diffraction and computer experiments in the studies of structure of liquids and amorphous solids P-15

The application of X-Ray diffraction and computer experiments in the studies of structure of liquids and amorphous solids M..

The crystal structure of compositionally homogeneous mixed ceria-zirconia oxides by high resolution X-ray and neutron diffraction methods

Studies of the real/atomic structure of single phase homogeneous nanocrystalline Ce 0.5 Zr 0.5 O 2±δ oxides prepared by a modified Pechini route by sophisticated diffraction