Anomalous volume expansion in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi><mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:mn>0.85</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>0.15</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: Neutron powder diffraction and magnetic Compton scattering

Taniguchi, Takashi; Mizusaki, S.; Okada, Noriko; Nagata, Y.; Mori, Kazuhiro; Wuernisha, Tuerxun; Kamiyama, Takashi; Hiraoka, N.; Itou, M.; Sakurai, Y.; Ozawa, Tadashi C.; Noro, Y.; Samata, H.

doi:10.1103/physrevb.75.024414

Cited by 11 publications

(18 citation statements)

References 25 publications

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“…The broadening effect in Mn 3 AN may also imply their peculiar electronic states after the introduction of ''relaxant'' elements. 161,162,233 As shown in Fig. Wang et al reported that Mn 3 Zn 0.93 N exhibits a near ZTE effect below 185 K according to the G 5g AFM phase, which was supported by Zn vacancies (Fig.…”

Section: Antiperovskite Mn 3 Anmentioning

confidence: 82%

“…The ZTE behaviour of this phase may originate from a competition between the usual thermal expansion and lattice contraction due to the gradual decrease of magnetic moment in the AFM region. 162 For example, Ca(Ru 0.85 Fe 0.15 )O 3 shows NTE below its T C (T C = 85 K, a V = À1.4 Â 10 À5 K À1 , 10-80 K). 228 230 In La 0.85Àx Y 0.15 Ca x MnO 3 , its orthorhombic symmetry (Pbnm) shows ferromagnetic ordering with the Mn moments parallel to the c axis.…”

Section: Antiperovskite Mn 3 Anmentioning

confidence: 99%

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Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications

et al. 2015

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Negative thermal expansion (NTE) is an intriguing physical property of solids, which is a consequence of a complex interplay among the lattice, phonons, and electrons. Interestingly, a large number of NTE materials have been found in various types of functional materials. In the last two decades good progress has been achieved to discover new phenomena and mechanisms of NTE. In the present review article, NTE is reviewed in functional materials of ferroelectrics, magnetics, multiferroics, superconductors, temperature-induced electron configuration change and so on. Zero thermal expansion (ZTE) of functional materials is emphasized due to the importance for practical applications. The NTE functional materials present a general physical picture to reveal a strong coupling role between physical properties and NTE. There is a general nature of NTE for both ferroelectrics and magnetics, in which NTE is determined by either ferroelectric order or magnetic one. In NTE functional materials, a multi-way to control thermal expansion can be established through the coupling roles of ferroelectricity-NTE, magnetism-NTE, change of electron configuration-NTE, open-framework-NTE, and so on. Chemical modification has been proved to be an effective method to control thermal expansion. Finally, challenges and questions are discussed for the development of NTE materials. There remains a challenge to discover a "perfect" NTE material for each specific application for chemists. The future studies on NTE functional materials will definitely promote the development of NTE materials.

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Section: Antiperovskite Mn 3 Anmentioning

confidence: 82%

Section: Antiperovskite Mn 3 Anmentioning

confidence: 99%

Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications

et al. 2015

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“…Ferromagnetism ͑or ferrimagnetism͒ occurs when the clusters order ferromagnetically by sharing a Ru ion. 11 On the contrary, ferromagnetism appears at a relatively large Mn content in the CaRu 1−x Mn x O 3 system. If Ru in CaRu 1−x Mn x O 3 is in the same electronic state as that in CaRu 1−x Fe x O 3 and the MnRu 6 cluster participates to the ferromagnetism, ferromagnetism will appear with very small Mn doping ͑x Ӷ 0.1͒.…”

Section: Magnetization Measurementsmentioning

confidence: 98%

“…[8][9][10] Our neutron diffraction and Mössbauer measurements for CaRu 0.85 Fe 0.15 O 3 revealed that there is no oxygen vacancy and that Fe exists as a trivalent ion. 11,12 In this case, Ru must exist as a Ru 5+ ion for charge compensation. Moreover, the magnetic Compton scattering measurement for CaRu 1−x Ti x O 3 showed the existence of Ti 3+ and Ru 5+ ions.…”

Section: A Crystallographic Properties and Electronic States Of Mn Amentioning

confidence: 99%

Crystallographic and magnetic properties of the mixed-valence oxidesCaRu1−xMnxO3

et al. 2008

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The crystallographic and magnetic properties of CaRu 1−x Mn x O 3 ͑0 Յ x Յ 1.0͒ were investigated in detail by x-ray powder diffraction, magnetization, and magnetic Compton scattering measurements. The lattice parameters show considerable deviation from Vegard's law. Ferromagnetism appears at a relatively large Mn concentration ͑x Ն 0.2͒, and the magnetization and the Curie temperature have a maximum at a Mn content near x = 0.7. The magnetic Compton scattering measurement revealed that Mn makes a dominant contribution to the magnetization and the Mn moment is antiparallel to the Ru moment, which is induced by Mn doping. The anomalous change in the unit cell volume and the occurrence of ferromagnetism were discussed on the basis of the mixed-valence model of Mn 3+ , Mn 4+ , Ru 4+ , and Ru 5+ ions. The Mn-composition dependence of the spontaneous magnetization was explained semiquantitatively assuming ͑1͒ ferromagnetic coupling between Mn 3+ and Mn 4+ ions, ͑2͒ antiferromagnetic coupling between Ru 5+ and Mn ions, and ͑3͒ the theoretical spin moments of Mn 3+ , Mn 4+ , and Ru 5+ . The ferromagnetic interaction between Mn 3+ and Mn 4+ ions seems to make a dominant contribution to the Curie temperature. The CaRu 1−x Mn x O 3 system is considered to be a ferrimagnet induced through competition between the ferromagnetic interaction between Mn ions and the antiferromagnetic interaction between Ru 5+ and Mn ions.

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“…CaRuO 3 is known to be an itinerant paramagnet that is on the verge of magnetic ordering [5]. Therefore, CaRuO 3 readily forms magnetic order when other metal ions are doped into Ru site [6][7][8][9][10][11][12][13][14][15][16]. However, the mechanism of the occurrence of ferromagnetism has not been understood well.…”

Section: Introductionmentioning

confidence: 98%

Ferromagnetism of epitaxially grown CaRu1−xMxO3 (M=Ti, Mn) films

Taniguchi

Ogawara

Fukuoka

et al. 2009

Journal of Magnetism and Magnetic Materials

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Anomalous volume expansion inCaRu0.85Fe0.15O3: Neutron powder diffraction and magnetic Compton scattering

Cited by 11 publications

References 25 publications

Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications

Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications

Crystallographic and magnetic properties of the mixed-valence oxidesCaRu1−xMnxO3

Ferromagnetism of epitaxially grown CaRu1−xMxO3 (M=Ti, Mn) films

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