Die Kristallstrukturen der Kupfer(II)-oxo-selenite Cu2O(SeO3) (kubisch und monoklin) und Cu4O(SeO3)3 (monoklin und triklin)

Effenberger, H.; Pertlik, F.

doi:10.1007/bf00811258

Cited by 79 publications

(79 citation statements)

References 5 publications

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“…This means that if metal atoms are bonded (as in metals or alloys), insertion of anions into the tetrahedral interstices leads to breaking of one sort of metal±metal bond and promotes the formation of others. References: (1) Sahl (1970); (2) Sterns et al (1986); (3) Starova et al (1991); (4) Scordari & Stasi (1990); (5) Effenberger & Pertlik (1986); (6) Starova et al (1998); (7) Guillen et al (1966); (8) Gastaldi et al (1982); (9) Palazzi & Jaulmes (1981); (10) Lulei (1998b); (11) Lulei (1998a); (12) Dzhurinskii et al (1991); (13) Mattfeld & Meyer (1994); (14) ; (15) Uhrlandt & Meyer (1995); (16) Smolin & Tkachev (1969); (17) Brixner et al (1985); (18) Tyulin & Efremov (1987); (19) Simon & Koehler (1986); (20) Schwanitz-Schu È ller & Simon (1985).…”

Section: The Matrix Effect and Its Consequences: Distortions Of Localmentioning

confidence: 99%

Metal arrays in structural units based on anion-centered metal tetrahedra

Krivovichev

Филатов

1999

Acta Crystallogr Sect B

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Structural units based on anion-centered metal tetrahedra (XA 4 ; X = O, N; A = metal) are described as eutactic metal fragments with anions in tetrahedral interstices. In this respect these units may be subdivided into¯uorite derivatives and units based on stellae quadrangulae (tetrahedral stars). To describe the geometry of the metal arrays a set of tetrahedrally packed metal radii, r tp , is derived for A = Cu, Pb, Bi, and some rare-earth metals from the systematic analysis of the AÁ Á ÁA distances within (XA 4 ) tetrahedra. Analysis of these radii and of the structural geometry of the units shows that the insertion of anions into tetrahedral interstices of the metal fragment causes its expansion and distortions by nonbonded anion±anion repulsions. The main effect is owing to the linkage of (XA 4 ) tetrahedra via edges, which leads to compression of the shared AÁ Á ÁA edges and stretching of the unshared edges. The geometry of this effect is described by some empirical expressions. It is suggested that the eutactic arrangement of metal atoms in structural units based on anion-centered metal tetrahedra is caused by the closedshell metal±metal bonding interactions

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Section: The Matrix Effect and Its Consequences: Distortions Of Localmentioning

confidence: 99%

Metal arrays in structural units based on anion-centered metal tetrahedra

Krivovichev

Филатов

1999

Acta Crystallogr Sect B

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“…Cu 2 OSeO 3 is a cubic material [11,12] (space group P2 1 3), consisting of a three-dimensional distorted pyrochlore (approximately fcc) lattice of corner-sharing Cu tetrahedra. Inequivalence of the copper sites and strong * Corresponding Author: cohn@physics.miami.edu magnetic interactions within tetrahedra lead to a 3-up-1-down, spin S = 1 magnetic state [13,14] that persists above the long-range magnetic ordering temperature [15,16].…”

Section: Introductionmentioning

confidence: 99%

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3

et al. 2017

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We report on the observation of magnon thermal conductivity κm ∼ 70 W/mK near 5 K in the helimagnetic insulator Cu2OSeO3, exceeding that measured in any other ferromagnet by almost two orders of magnitude. Ballistic, boundary-limited transport for both magnons and phonons is established below 1 K, and Poiseuille flow of magnons is proposed to explain a magnon mean-free path substantially exceeding the specimen width for the least defective specimens in the range 2K < T < 10 K. These observations establish Cu2OSeO3 as a model system for studying longwavelength magnon dynamics.

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“…Besides, in the paramagnetic phase it has high cubic symmetry but without showing inversion symmetry (space group P2 1 3) [2][3][4]. This space group does not allow electric polarization in the paramagnetic phase but it permits a linear magnetoelectric (ME) effect in the magnetically ordered state.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study

Gnezdilov

Lamonova

Pashkevich

et al. 2010

Low Temperature Physics

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We report Raman scattering studies and magneto/structural symmetry analysis of the many sublattices ferrimagnet Cu 2 OSeO 3 with a cubic symmetry and a linear magnetoelectric effect. There is no spectroscopic evidence for structural lattice distortions below T C = 60 K, which are expected due to magnetoelectric coupling. Using symmetry arguments we explain this observation by considering a special type of ferrimagnetic ground state which does not generate a spontaneous electric polarization. Interestingly, Raman scattering shows a strong increase of electric polarization of media through a dynamic magnetoelectric effect as a remarkable enhancement of the scattering intensity below T C . New lines of purely magnetic origin have been detected in the magnetically ordered state. A part of them are attributed as scattering on exchange magnons. Using this observation and further symmetry considerations we argue for strong Dzyaloshinskii-Moriya interaction existing in the Cu 2 OSeO 3 .

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Die Kristallstrukturen der Kupfer(II)-oxo-selenite Cu2O(SeO3) (kubisch und monoklin) und Cu4O(SeO3)3 (monoklin und triklin)

Cited by 79 publications

References 5 publications

Metal arrays in structural units based on anion-centered metal tetrahedra

Metal arrays in structural units based on anion-centered metal tetrahedra

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3

Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study

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