Ternäre Fluoride ABF4 eines neuen Strukturtyps

Schnering, Hans Georg̀ von; Bleckmann, P.

doi:10.1007/bf00600459

Cited by 94 publications

(27 citation statements)

References 2 publications

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“…30,31 It was recently shown that BaNiF 4 exhibits two distinct antiferromagnetic order parameters and that the order parameter corresponding to the "weak" ͑secondary͒ antiferromagnetic order can be reversed by using an electric field. 28 The crystallographic structure of BaNiF 4 is orthorhombic corresponding to space group Cmc2 1 .…”

Section: A Banifmentioning

confidence: 99%

“…28 The crystallographic structure of BaNiF 4 is orthorhombic corresponding to space group Cmc2 1 . 30,31 The magnetic space group is P a 2 1 , 32 which contains a nonprimitive translation along the a direction combined with time inversion. 33 This reflects the fact that the antiferromagnetic ordering in BaNiF 4 leads to a unit cell doubling compared to the paramagnetic phase.…”

Section: A Banifmentioning

confidence: 99%

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Towards a microscopic theory of toroidal moments in bulk periodic crystals

2007

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We present a theoretical analysis of magnetic toroidal moments in periodic systems, in the limit in which the toroidal moments are caused by a time and space reversal symmetry breaking arrangement of localized magnetic dipole moments. We summarize the basic definitions for finite systems and address the question of how to generalize these definitions to the bulk periodic case. We define the "toroidization" as the toroidal moment per unit cell volume, and we show that periodic boundary conditions lead to a multivaluedness of the toroidization, which suggests that only differences in toroidization are meaningful observable quantities. Our analysis bears strong analogy to the "modern theory of electric polarization" in bulk periodic systems, but we also point out some important differences between the two cases. We then discuss the instructive example of a one-dimensional chain of magnetic moments, and we show how to properly calculate changes of the toroidization for this system. Finally, we evaluate and discuss the toroidization ͑in the local dipole limit͒ of four important example materials:

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Section: A Banifmentioning

confidence: 99%

Section: A Banifmentioning

confidence: 99%

Towards a microscopic theory of toroidal moments in bulk periodic crystals

2007

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“…Sr,CuF, crystallizes orthorhombically, and not tetragonally, in s p a y group Bbam : a = 5.708(1), b= 5.708 (1) SrCuF, and CaCuF, as well as SrCrF, crystals are of tetragonal KBrF, type, also with square-planar CU(II) or Cr(Ix) coordination [SrCuF, : a = 5.643 (2), c = 10.672(5) A ; CaCuF,: a = 5.377(2), c= 10.320(5) A]. Here too the different findings of other authorsf1] can be attributed to symmetry errors.…”

Section: Structure Of Ternarymentioning

confidence: 99%

Structure of Ternary Copper(II) and Chromium(II) Fluorides

Kolloch

Kolodziejczyk

1971

Angew. Chem. Int. Ed. Engl.

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“…19,20 The reason could be that previous authors have used single crystal whereas in this work, powder samples have been used. The rounded corner of the loops indicates that the samples show leakage current.…”

Section: A Ferroelectric Studymentioning

confidence: 99%

Bifunctional properties of hydrothermal synthesized BaMF4 (M = Co, Ni and Zn)

et al. 2013

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BaMF4 (M = Co, Ni and Zn) samples having orthorhombic structure have been synthesized by a mild hydrothermal method and characterized by x-ray diffraction (XRD), magnetic and electrical measurements. Single phase formation of these compounds has been found to be dependent on various factors like reaction time, pH, temperature etc. All the samples showed ferroelectricity, which decreases with increase in temperature. BaMF4 (M = Co, Ni) samples show 10-15 times more leakage current compared to that of BaZnF4 at higher applied field. Absence of multivalent ions in BaZnF4 can be the reason for its minimum leakage current. All the samples except, BaZnF4, exhibit weak room temperature ferromagnetism also

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Ternäre Fluoride ABF4 eines neuen Strukturtyps

Cited by 94 publications

References 2 publications

Towards a microscopic theory of toroidal moments in bulk periodic crystals

Towards a microscopic theory of toroidal moments in bulk periodic crystals

Structure of Ternary Copper(II) and Chromium(II) Fluorides

Bifunctional properties of hydrothermal synthesized BaMF4 (M = Co, Ni and Zn)

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