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Journal Articles

Atomic-scale visualization of surface-assisted orbital order

Kim, H.*; Yoshida, Yasuo*; Lee, C.-C.*; Chang, T.-R.*; Jeng, H.-T.*; Lin, H.*; Haga, Yoshinori; Fisk, Z.*; Hasegawa, Yukio*

Science Advances (Internet), 3(9), p.eeao0362_1 - eeao0362_5, 2017/09

https://doi.org/10.1126/sciadv.aao0362
 Times Cited Count：11 Percentile：61.86(Multidisciplinary Sciences)

Journal Articles

Structural properties and phase transition of hole-orbital-ordered (C$$_{2}$$H$$_{5}$$NH$$_{3}$$)$$_{2}$$CuCl$$_{4}$$ studied by resonant and non-resonant X-ray scatterings under high pressure

Owada, Kenji; Ishii, Kenji; Inami, Toshiya; Murakami, Yoichi; Shobu, Takahisa*; Osumi, Hiroyuki*; Ikeda, Naoshi*; Oishi, Yasuo*

Physical Review B, 72(1), p.014123_1 - 014123_10, 2005/07

https://doi.org/10.1103/PhysRevB.72.014123
 Times Cited Count：27 Percentile：69.97(Materials Science, Multidisciplinary)

The effects of hydrostatic pressure on a structure and the corresponding resonant X-ray scattering (RXS) spectrum have been investigated for the hole-orbital-ordered compound (C$$_{2}$$H$$_{5}$$NH$$_{3}$$)$$_{2}$$CuCl$$_{4}$$. We have found a structural phase transition at Pc=4 GPa. The reduction of the Jahn-Teller distortion (JTD) toward Pc is also ascertained by structural analyses. The gradual change in the color of the crystal is also observed in connection with the structural change near Pc. We experimentally confirmed that the RXS intensity comes from the polarization of the density of states of px and py symmetries, which is mainly dominated not by the on-site 3d-4p Coulomb interaction but by the JTD of the CuCl$$_{6}$$ octahedron. The RXS study under a high pressure shows no striking change as JTD is suppressed by the application of pressure. On the other hand, the RXS intensity becomes zero above Pc. The results indicate that the local environment of the Cu$$^{2+}$$ ion markedly changes. Two possible structures above Pc are proposed.

Journal Articles

Spin wave and orbital ordering in the C-type antiferromagnetic phase of Nd$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yoshizawa, Hideki*; Kawasaki, Ryuichi*; Noda, Kohei*; Kuwahara, Hideki*

Journal of the Physical Society of Japan, 74(1), p.502 - 503, 2005/01

https://doi.org/10.1143/JPSJ.74.502
 Times Cited Count：2 Percentile：19.73(Physics, Multidisciplinary)

The spin wave dispersion relation of the C-type antiferromagnetic structure in Nd$$_{0.25}$$Sr$$_{0.75}$$MnO$$_{3}$$ was determined by neutron scattering. The spin exchange interactions show a large anisotropy, which evidences the d$$_{3z^2-r^2}$$ orbital ordering along the $$c$$ axis. The exchange interaction along the $$c$$ direction is fairly large and similar to the value in the ferromagnetic metallic phase, suggesting there is finite hopping of charges along the orbital chains.

Journal Articles

Resonant X-ray scattering in KCuF$$_{3}$$

Takahashi, Manabu*; Igarashi, Junichi

Physica B; Condensed Matter, 329-333(Part2), p.870 - 871, 2003/05

https://doi.org/10.1016/S0921-4526(02)02590-5
 Times Cited Count：2 Percentile：15.13(Physics, Condensed Matter)

We study the resonant X-ray scattering (RXS) spectra around the Cu K edge in KCuF$$_{3}$$ on the basis of the band structure calculation combined with the LDA+U approximation. The lattice distortion is introduced as inputs of the calculation. We reproduce well the experimental spectra as a function of photon energy around the main--K--edge (MKE). The spectral structure around the MKE is independent of the magnetic order (MO) and the orbital order (OO) but strongly dependent on the magnitude of the Jahn--Teller distortion (JTD).

JAEA Reports

Abstracts of the Workshop on Orbital Ordering and Fluctuations in d- and f-electron Systems; March 4-6, 2002, ASRC, JAERI, Tokai, Japan

Ueda, Kazuo; Hotta, Takashi

JAERI-Review 2002-037, 31 Pages, 2002/12

JAERI-Review-2002-037.pdf:2.7MB

Strongly correlated f- and d-electron systems including heavy Fermion systems and transition metal oxides are important source of exciting new phenomena in condensed matter physics. Recently it has been recognized in more profound way that the orbital degeneracy of the f- and d-electrons plays very important role underlying those exotic phenomena. The idea of the present workshop is to bring active researchers in the field together and to exchange ideas in informal atmosphere. In the workshop many interesting results were presented and stimulating discussions were made as clearly seen by the present report.

Journal Articles

Orbital ordering in manganites and ruthenates

Hotta, Takashi; Dagotto, E.*

Physica B; Condensed Matter, 312-313(1-4), p.700 - 702, 2002/03

https://doi.org/10.1016/S0921-4526(01)01491-0
 Times Cited Count：2 Percentile：14.62(Physics, Condensed Matter)

The crucial role of the orbital degree of freedom is here discussed in order to understand the complex spin and charge structures of transition metal oxides. For manganites, it is shown that diagonal charge stripes in the ferromagnetic phase are induced by the staggered orbital ordered pattern, while for ruthenates, a novel orbital ordering is found to exist in the G-type antiferromagnetic structure, with a hole arrangement as recently observed in X-ray experiments.

Journal Articles

Prediction of orbital ordering in single-layered ruthenates

Hotta, Takashi; Dagotto, E.*

Physical Review Letters, 88(1), p.017201_1 - 017201_4, 2002/01

https://doi.org/10.1103/PhysRevLett.88.017201
 Times Cited Count：80 Percentile：89.97(Physics, Multidisciplinary)

The key role of the orbital degree of freedom to understand the magnetic properties of layered ruthenates is here discussed. In the G-type antiferromagnetic (AFM) phase of Ca$$_2$$RuO$$_4$$, recent X-ray experiments reported the presence of 0.5 hole per site in the $$d_{rm xy}$$ orbital, while the $$d_{rm yz}$$ and $$d_{rm zx}$$ orbitals contain 1.5 holes. This unexpected $$t_{rm 2g}$$ hole distribution is explained by a novel state with orbital ordering (OO), stabilized by a combination of Coulomb interactions and lattice distortions. In addition, the rich phase diagram presented here suggests the possibility of large magnetoresistance effects, and predicts a new ferromagnetic OO phase in ruthenates.

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