scholarly journals Sinusoidal magnetic structure in a three-dimensional antiferromagneticCo2(OH)AsO4: Incommensurate-commensurate magnetic phase transition

2010 ◽  
Vol 81 (13) ◽  
Author(s):  
I. de Pedro ◽  
J. M. Rojo ◽  
J. Rodríguez Fernández ◽  
M. T. Fernández-Díaz ◽  
T. Rojo
Keyword(s):  
Phase Transition ◽  
Magnetic Structure ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Three Dimensional

scholarly journals Neutron diffraction study of magnetic structure in multiferroics under pressure

2014 ◽  
Vol 70 (a1) ◽  
pp. C152-C152 ◽  
Author(s):  
Hiroyuki Kimura ◽  
Sei Fujiyama ◽  
Jin Lin ◽  
Mamoru Fukunaga ◽  
Yukio Noda ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Magnetic Structure ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Scientific Research ◽  
Neutron Diffraction Study ◽  
Electric Polarization ◽  
Exploratory Research

RMn2O5 (R = Y, Bi, rare-earth) is one of the prototypical multiferroic materials that exhibits a rich variety of magnetoelectric effects. Since the successive magnetic and ferroelectric phase transitions simultaneously take place, magnetic order has been thought to be a primary order parameter for the ferroelectricity in this system. We recently have found that in neutron diffraction study of 153EuMn2O5, magnetic phase transition is induced by applying hydrostatic pressure. As temperature decreases upon p = 1.4 GPa, the magnetic propagation wave vector changes from qM = (1/2, 0, 1/3) to (1/2, 0, 1/2), indicating that the period of magnetic unit cell as well as the magnetic structure change at the phase transition. We have also carried out the dielectric and polarization measurements under pressure and established magnetic and dielectric phase diagram as functions of temperature and pressure as shown in the figure. This study has revealed that the ferroelectric (FE1) – ferroelectric (FE2) phase transition concomitantly occurs at the magnetic phase transition, where the electric polarization is enhanced. To clarify the relevance between the ferroelectricity and the magnetic structure, we carried out single crystal magnetic structure analysis of 153EuMn2O5 upon ambient- and high-pressure. In the magnetic phase with qM = (1/2, 0, 1/3), cycloidal magnetic structure of manganese spins propagating along c-axis is realized. On the contrary in the magnetic phase with qM = (1/2, 0, 1/2), the spins arrange almost collinearly along c-axis. The result indicates that the presence of the cycloidal spin structure plays an important role for inducing (or reducing) the electric polarization in this compound. This study was supported by "KAKENHI"-programs of Scientific Research (B) (24340064), Scientific Research (A) (21244051), Challenging Exploratory Research (23654098) and of Scientific Research on Priority Areas "Novel States of Matter Induced by Frustration" (19052001).

scholarly journals Spin- and chirality-orderings of frustrated magnets – stacked-triangular anti-ferromagnets and spin glasses

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1447-1458 ◽  
Author(s):  
H Kawamura
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Triangular Lattice ◽  
Spin Glasses ◽  
Magnetic Phase ◽  
Three Dimensional ◽  
Frustrated Magnets ◽  
Spin Frustration ◽  
Spin Structures ◽  
Experimental Works

"Chirality" is a multispin quantity representing the sense or the handedness of the noncollinear spin structures induced by spin frustration. Recent studies have revealed that the chirality often plays an important role in the ordering of certain frustrated magnets. Here I take up two such examples, stacked-triangular anti-ferromagnets and spin glasses, where the inherent chiral degree of freedom affects underlying physics and might lead to novel ordering phenomena. The first topic is the criticality of the magnetic-phase transition of vector (i.e., XY or Heisenberg) anti-ferromagnets on the three-dimensional stacked-triangular lattice. The second topic is the nature of the spin-glass ordering. I will review the recent theoretical and experimental works on these topics, with particular emphasis on the important role played by the chirality. PACS Nos.: 67.70+n, 67.57Lm

Magnetic phase transition and magnetic structure of ground state in CsDyW O

2002 ◽  
Vol 29 (1) ◽  
pp. 9-14 ◽  
Author(s):  
V.P. Dyakonov ◽  
M.T. Borowiec ◽  
A. Jedrzejczak ◽  
M. Górska ◽  
N.A. Doroshenko ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Structure ◽  
Magnetic Phase Transition ◽  
Ground State ◽  
Magnetic Phase

Long-Time Variation of Magnetic Structure in (PrxLa1−x)Co2Si2: Coexistence of Slow and Fast Processes in Magnetic Phase Transition

2017 ◽  
Vol 86 (4) ◽  
pp. 044707
Author(s):  
Kiyoichiro Motoya ◽  
Masato Hagihala ◽  
Toru Shigeoka ◽  
Daniel Pajerowski ◽  
Masaaki Matsuda
Keyword(s):  
Phase Transition ◽  
Magnetic Structure ◽  
Magnetic Phase Transition ◽  
Time Variation ◽  
Magnetic Phase ◽  
Long Time
Sign in / Sign up

Export Citation Format

Share Document