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Journal Articles

Origin of the large ferroelectric polarization enhancement under high pressure for multiferroic DyMnO$$_{3}$$ studied by polarized and unpolarized neutron diffraction

Terada, Noriki*; Qureshi, N.*; Stunault, A.*; Enderle, M.*; Ouladdiaf, B.*; Colin, C. V.*; Khalyavin, D. D.*; Manuel, P.*; Orlandi, F.*; Miyahara, Shin*; et al.

Physical Review B, 102(8), p.085131_1 - 085131_7, 2020/08

 Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)

Journal Articles

Magnetic ordering in pressure-induced phases with giant spin-driven ferroelectricity in multiferroic TbMnO$$_{3}$$

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Osakabe, Toyotaka; Kikkawa, Akiko*; Kitazawa, Hideaki*

Physical Review B, 93(8), p.081104_1 - 081104_5, 2016/02

 Times Cited Count:17 Percentile:70.52(Materials Science, Multidisciplinary)

We performed neutron diffraction experiments under high pressures and high magnetic fields using a single crystal of the multiferroic compound TbMnO$$_{3}$$ in order to clarify the mechanism associated with pressure/magnetic-field-induced giant ferroelectric polarization. We found that the E-type ordering of Mn spins induces giant ferroelectric polarization over all the parameter regions investigated, through an exchange striction mechanism. Furthermore, we propose that the polarization is reduced by polar ordering of the Tb moments in a zero magnetic field and is enhanced via the field-induced transition from polar to nonpolar Tb orderings at 2T.

Journal Articles

Pressure-induced polar phases in multiferroic delafossite CuFeO$$_{2}$$

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Osakabe, Toyotaka; Radaelli, P. G.*; Kitazawa, Hideaki*

Physical Review B, 89(22), p.220403_1 - 220403_6, 2014/06

AA2014-0251.pdf:1.02MB

 Times Cited Count:28 Percentile:79.13(Materials Science, Multidisciplinary)

We have studied the pressure effect on the magnetic orderings in the strongly frustrated antiferromagnet CuFeO$$_{2}$$, by using neutron diffraction experiments under hydrostatic pressure. The main result is elucidation of the pressure-temperature magnetic phase diagram, consisting of the fourmagnetic phases including two polar ones. In particular, in the 3 GPa $$<$$ P $$<$$ 4 GPa pressure range, the ICM2 phase with the proper screw magnetic ordering stabilized. This polar phase is almost identical to the ferroelectric incommensurate (FEIC) phase induced by either a magnetic field or chemical doping. Furthermore, above 4 GPa, a new low-symmetry phase ICM3 is realized. This is unique for the family of delafossite multiferroics and implies an admixture of both cycloidal and proper screw spin configurations. The sequence of the observed magnetic phases with changing pressure might be attributed to pressure suppression of the monoclinic lattice distortions responsible for releasing the spin frustration in the system.

Oral presentation

High pressure neutron diffraction experiments on triangular lattice Antiferromagnet CuFeO$$_{2}$$ using hybrid anvil cell

Terada, Noriki*; Osakabe, Toyotaka; Khalyavin, D. D.*; Manuel, P.*; Radaelli, P. G.*; Kitazawa, Hideaki*

no journal, , 

We have investigated the pressure effect on magnetic orderings in triangular lattice antiferromagnet CuFeO$$_{2}$$ up to 3.2 GPa, by means of neutron diffraction experiments with the hybrid-anvil-cell. The magnetic ground state of CuFeO$$_{2}$$ with ${it k}$ = (1/4, 1/4, 3/2) in ambient pressure is changed in to the other magnetic state under pressure. In the pressure induced phase, we observed the magnetic reflections at (${it q}$, ${it q}$, 3/2) and (1-${it q}$, 1-${it q}$, 3/2), ${it q}$ $$sim$$ 0.2 at 3.2 GPa and 1.5 K, which are the identical positions to those in field-induced or nonmagnetic impurity-induced noncollinear magnetic phase with ferroelectric polarization. This might suggest that pressure induces the ferro- electric phase in CuFeO$$_{2}$$.

Oral presentation

Characterization of fuel debris (27'A), 8; Characterization of MCCI test products for post severe accident

Yano, Kimihiko; Kitagaki, Toru; Ogino, Hideki; Washiya, Tadahiro; Pascal, P.*; Jean-Fran$c{c}$ois, H.*; Patricia, C.*; Anne, B.*; Brissonneau, L.*; Brigitte, T.*; et al.

no journal, , 

In a collaborative agreement with Commissariat $`a$ l'$'e$nergie atomique et aux $'e$nergies alternatives (CEA), the characterization of MCCI products was carried out using the materials that CEA produced in its past large-scale MCCI test. Samples of a corium oxide phase and an interface of corium/concrete phases were selected. They were observed by SEM/EDS and measured by Vickers Hardness Tester.

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