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Journal Articles

Elastic and inelastic neutron scattering experiments under high pressure in the frustrated antiferromagnet CuFeO$$_{2}$$

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Asai, Shinichiro*; Masuda, Takatsugu*; Saito, Hiraku*; Nakajima, Taro*; Osakabe, Toyotaka

Physical Review B, 110(2), p.024406_1 - 024406_9, 2024/07

https://doi.org/10.1103/PhysRevB.110.024406

The frustrated antiferromagnet CuFeO$$_{2}$$ exhibits pressure-induced complex magnetic phase transitions from the commensurate collinear (CM1) phase to several incommensurate noncollinear phases. To study the effect of high pressure on magnetic interactions, we performed neutron diffraction and inelastic neutron scattering experiments under high-pressure conditions. With increasing pressure, the CM1 ground state becomes less stable against application of a magnetic field even below the critical pressure ($${P}$$ $$leqq$$ 3 GPa), as proved by the significant reduction in the critical magnetic field from $${H_{c1}}$$ =7.5 T to 4.5 T at 2.1 GPa. Additionally, the energy gap in the spin-wave dispersion relation is reduced from 1.0 to 0.88 meV by the application of a pressure of $${P}$$ = 2.1 GPa. Comparing the experimental results with spin-wave calculations revealed that the change in the spin-wave excitation can be explained by the reduction in either the uniaxial anisotropy term or the degree of separation in the nearest-neighbor exchange interactions.

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

https://doi.org/10.1103/PhysRevB.102.085131
 Times Cited Count：3 Percentile：18.79(Materials Science, Multidisciplinary)

Journal Articles

Spherical neutron polarimetry under high pressure for a multiferroic delafossite ferrite

Terada, Noriki*; Qureshi, N.*; Chapon, L. C.*; Osakabe, Toyotaka

Nature Communications (Internet), 9, p.4368_1 - 4368_9, 2018/10

https://doi.org/10.1038/s41467-018-06737-6
 Times Cited Count：5 Percentile：25.26(Multidisciplinary Sciences)

Journal Articles

Magnetic Bragg dip and Bragg edge in neutron transmission spectra of typical spin superstructures

Mamiya, Hiroaki*; Oba, Yojiro; Terada, Noriki*; Watanabe, Norimichi*; Hiroi, Kosuke; Shinohara, Takenao; Oikawa, Kenichi

Scientific Reports (Internet), 7(1), p.15516_1 - 15516_8, 2017/11

https://doi.org/10.1038/s41598-017-15850-3
 Times Cited Count：3 Percentile：16.80(Multidisciplinary Sciences)

no abstracts in English

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

https://doi.org/10.1103/PhysRevB.93.081104
 Times Cited Count：18 Percentile：62.53(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

https://doi.org/10.1103/PhysRevB.89.220403
 Times Cited Count：29 Percentile：74.35(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.

Journal Articles

Magnetic and nonmagnetic impurity effect on magnetic orderings of the isosceles-triangular-lattice antiferromagnet CuMnO$$_2$$

Terada, Noriki*; Tsuchiya, Yoshinori*; Kitazawa, Hideaki*; Metoki, Naoto

Journal of the Korean Physical Society, 62(12), p.1905 - 1909, 2013/06

https://doi.org/10.3938/jkps.62.1905
 Times Cited Count：3 Percentile：27.11(Physics, Multidisciplinary)

We have investigated magnetic and nonmagnetic impurity substitution effects on magnetic ordering of a frustrated isosceles triangular lattice antiferromagnet CuMnO$$_2$$ by means of the magnetic neutron diffraction measurements on Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$. While the magnetic wave vector of the magnetic ground state of "magnetically" substituted Cu(Mn$$_{1-x}$$Cu$$_x$$)O$$_2$$ with x = 0:04 is Q = (-1/2 1/2 0), that in the "nonmagnetically" substituted Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$ with y =0.05, 0.15 and 0.20 is Q = (-1/2 1/2 1/2) that is identical to that of pure CuMnO$$_2$$. We discuss an influence of magnetic or nonmagnetic impurity substitution on the magnetic ordering of CuMnO$$_2$$, by comparing the results of Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$ with Cu(Mn$$_{1-x}$$Cux)O$$_2$$.

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ (x =0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

https://doi.org/10.1143/JPSJ.81.094710

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ ($$x$$ = 0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

https://doi.org/10.1143/JPSJ.81.094710
 Times Cited Count：13 Percentile：63.06(Physics, Multidisciplinary)

Journal Articles

Magnons and electromagnons in a spin-lattice-coupled frustrated magnet CuFeO$$2$$ as seen via inelastic neutron scattering

Nakajima, Taro*; Suno, Azusa*; Mitsuda, Setsuo*; Terada, Noriki*; Kimura, Shojiro*; Kaneko, Koji; Yamauchi, Hiroki

Physical Review B, 84(18), p.184401_1 - 184401_7, 2011/11

https://doi.org/10.1103/PhysRevB.84.184401
 Times Cited Count：33 Percentile：76.79(Materials Science, Multidisciplinary)

Journal Articles

Magnetic correlations and the influence of atomic disorder in frustrated isosceles triangular lattice antiferromagnet CuMnO$$_2$$

Terada, Noriki*; Tsuchiya, Yoshinori*; Kitazawa, Hideaki*; Osakabe, Toyotaka; Metoki, Naoto; Igawa, Naoki; Oyama, Kenji*

Physical Review B, 84(6), p.064432_1 - 064432_8, 2011/08

https://doi.org/10.1103/PhysRevB.84.064432
 Times Cited Count：17 Percentile：57.37(Materials Science, Multidisciplinary)

We have studied the magnetic correlations of the isosceles triangular lattice antiferromagnet CuMnO$$_2$$. Above $$T$$$$_{rm N}$$, the magnetic correlations are characterized by a two-dimensional (2D) short-range correlation. Below $$T$$$$_{rm N}$$, the magnetic structures have been identified to be collinear with the magnetic moments almost parallel to the $$d_{z^2}$$ orbitals. The stacking sequence along the $$c$$ direction is changed from antiferromagnetic to ferromagnetic by atomic disorder. We find that the second-nearest-neighbor interlayer interaction plays an important role for the magnetic stacking along the $$c$$ axis. The magnetic excitation below $$T$$$$_{rm N}$$ is characterized by collective spin-wave excitation with an energy gap of 6 meV from the three-dimensional long-range magnetic order and by spin-liquid-like 2D excitation, indicated by specific heat.

Journal Articles

High-pressure suppression of long-range magnetic order in the triangular-lattice antiferromagnet CuFeO$$_{2}$$

Terada, Noriki*; Osakabe, Toyotaka; Kitazawa, Hideaki*

Physical Review B, 83(2), p.020403_1 - 020403_4, 2011/01

https://doi.org/10.1103/PhysRevB.83.020403
 Times Cited Count：12 Percentile：46.87(Materials Science, Multidisciplinary)

We succeeded in observing pressure-suppressed magnetic long-range ordering (LRO) in the triangular-lattice antiferromagnet CuFeO$$_{2}$$, using neutron-diffraction experiments under an isotropic pressure. The magnetic LRO of the four-sublattice ground state under ambient pressure in CuFeO$$_{2}$$ almost disappears at the high pressure of 7.9 GPa, and is replaced by an incommensurate order with temperature-independent wave number of (0.192 0.192 1.5). The incommensurate wave number observed at 7.9 GPa corresponds to that observed just above the temperature at which lattice distortion and magnetic LRO simultaneously occur under ambient pressure. Therefore, the long-range magnetic ordering disappears because the high pressure suppressed the lattice distortion that otherwise relieves spin frustration and leads the spin system to LRO.

Journal Articles

Field-induced incommensurate-to-commensurate transition in the triangular lattice antiferromagnet GdPd$$_2$$Al$$_3$$

Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*; Sakai, Osamu*

Journal of Physics; Conference Series, 200, p.032022_1 - 032022_4, 2010/02

https://doi.org/10.1088/1742-6596/200/3/032022
 Times Cited Count：0 Percentile：0.04(Materials Science, Multidisciplinary)

Journal Articles

Exchange-striction associated with the elliptical proper helical magnetic structure in the ferroelectric phase of CuFe$$_{1-y}$$Ga$$_{y}$$O$$_{2}$$

Terada, Noriki*; Nakajima, Taro*; Mitsuda, Setsuo*; Matsuda, Masaaki; Kakurai, Kazuhisa; Tanaka, Yoshihito*; Kitazawa, Hideaki*

Journal of Physics; Conference Series, 211(1), p.012005_1 - 012005_6, 2010/01

https://doi.org/10.1088/1742-6596/211/1/012005
 Times Cited Count：2 Percentile：66.71(Physics, Applied)

Journal Articles

Resonant magnetic X-ray diffraction study on the triangular lattice antiferromagnet GdPd$$_2$$Al$$_3$$

Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*; Sakai, Osamu*

Journal of the Physical Society of Japan, 78(8), p.084713_1 - 084713_5, 2009/08

https://doi.org/10.1143/JPSJ.78.084713
 Times Cited Count：13 Percentile：60.71(Physics, Multidisciplinary)

Journal Articles

Oscillation photography applied to resonant X-ray diffraction

Inami, Toshiya; Toyokawa, Hidenori*; Terada, Noriki*; Kitazawa, Hideaki*

Journal of Physics; Conference Series, 150, p.042069_1 - 042069_4, 2009/03

https://doi.org/10.1088/1742-6596/150/4/042069
 Times Cited Count：1 Percentile：61.04(Thermodynamics)

Journal Articles

Identification of microscopic spin-polarization coupling in the ferroelectric phase of magnetoelectric multiferroic CuFe$$_{1-x}$$Al$$_x$$O$$_2$$

Nakajima, Taro*; Mitsuda, Setsuo*; Inami, Toshiya; Terada, Noriki*; Osumi, Hiroyuki*; Prokes, K.*; Podlesnyak, A.*

Physical Review B, 78(2), p.024106_1 - 024106_10, 2008/07

https://doi.org/10.1103/PhysRevB.78.024106
 Times Cited Count：34 Percentile：77.29(Materials Science, Multidisciplinary)

Oral presentation

Detailed analysis of magnetic and crystalline structure of multiferroic CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ by means of CRYOPAD and RXS

Kaneko, Chikafumi*; Nakajima, Taro*; Mitsuda, Setsuo*; Terada, Noriki*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Tanaka, Yoshikazu*

no journal, , 

no abstracts in English

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

Giant magnetocaloric effect and short-range ordering of magnetic refrigerant materials R$$_5$$Pd$$_2$$(R=Tb, Ho)

Kitazawa, Hideaki*; Kawamura, Yukihiko*; Keller, L.*; Toyoizumi, Saori*; Terada, Noriki*; Suzuki, Hiroyuki*; Mamiya, Hiroaki*; Doenni, A.*; Lee, S.*; Metoki, Naoto; et al.

no journal, , 

Neutron Scattering study has been carried out in order to reveal the magnetic structure of the antiferromagnet Ho$$_5$$Pd$$_2$$, which shows giant magnetocaloric effect. We observed short rage magnetic order at k=0.18, 0.18, 0.18 above the antiferromagnetic transition temperature $$T$$$$_N$$. Tb$$_5$$Pd$$_2$$ also showed magnetic short range correlation above the temperature higher than 2$$times$$$$T$$$$_N$$.

31 (Records 1-20 displayed on this page)