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Structure and properties of the 5.5 K antiferromagnet EuAu2Ge2

Schellenberg, Inga; Hermes, Wilfried LU ; Lidin, Sven LU and Poettgen, Rainer (2011) In Zeitschrift für Kristallographie 226(3). p.214-218
Abstract
A well crystallized sample of EuAti(2)Ge(2) was synthesized by arc-melting of the elements. The structure was refined on the basis of single crystal X-ray diffractometer data: ThCr2Si2 type, 14/mmm, a = 447.3(1), c = 1034.0(4) pm, wR2 = 0.0575, 148 F-2 values and 9 variables. The gold atoms have tetrahedral germanium coordination (261 pm Au-Ge). These AuGe4/4 tetrahedra share four common edges, leading to layers which are connected via Ge-Ge bonds (247 pm). The europium atoms fill cages of coordination number 16 within the [Au2Ge2](delta-) polyanion. Temperature dependent susceptibility measurements show a magnetic moment of 7.79(1)mu(B)/formula unit. Together with the Eu-151 Mossbauer spectroscopic data (isomer shift of -11.43 mm/s at... (More)
A well crystallized sample of EuAti(2)Ge(2) was synthesized by arc-melting of the elements. The structure was refined on the basis of single crystal X-ray diffractometer data: ThCr2Si2 type, 14/mmm, a = 447.3(1), c = 1034.0(4) pm, wR2 = 0.0575, 148 F-2 values and 9 variables. The gold atoms have tetrahedral germanium coordination (261 pm Au-Ge). These AuGe4/4 tetrahedra share four common edges, leading to layers which are connected via Ge-Ge bonds (247 pm). The europium atoms fill cages of coordination number 16 within the [Au2Ge2](delta-) polyanion. Temperature dependent susceptibility measurements show a magnetic moment of 7.79(1)mu(B)/formula unit. Together with the Eu-151 Mossbauer spectroscopic data (isomer shift of -11.43 mm/s at 77K), the magnetic data point to stable divalent europium. EuAu2Ge2 orders antiferromagnetically at T-N1 = 5.5(1) K, followed by a spin-reorientation at T-N2 = 3.5 K. A metamagnetic step occurs around 20 kOe in the 4 K magnetization isotherm. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Intermetallics, Europium, Mossbauer spectroscopy, Antiferromagnetic, transition
in
Zeitschrift für Kristallographie
volume
226
issue
3
pages
214 - 218
publisher
Oldenbourg Verlag
external identifiers
  • wos:000289863800003
  • scopus:79952571656
ISSN
0044-2968
DOI
10.1524/zkri.2011.1317
language
English
LU publication?
yes
id
f61c7745-f96f-4378-8170-e70ef5c6a038 (old id 1964163)
date added to LUP
2011-05-24 07:58:45
date last changed
2017-01-01 06:14:42
@article{f61c7745-f96f-4378-8170-e70ef5c6a038,
  abstract     = {A well crystallized sample of EuAti(2)Ge(2) was synthesized by arc-melting of the elements. The structure was refined on the basis of single crystal X-ray diffractometer data: ThCr2Si2 type, 14/mmm, a = 447.3(1), c = 1034.0(4) pm, wR2 = 0.0575, 148 F-2 values and 9 variables. The gold atoms have tetrahedral germanium coordination (261 pm Au-Ge). These AuGe4/4 tetrahedra share four common edges, leading to layers which are connected via Ge-Ge bonds (247 pm). The europium atoms fill cages of coordination number 16 within the [Au2Ge2](delta-) polyanion. Temperature dependent susceptibility measurements show a magnetic moment of 7.79(1)mu(B)/formula unit. Together with the Eu-151 Mossbauer spectroscopic data (isomer shift of -11.43 mm/s at 77K), the magnetic data point to stable divalent europium. EuAu2Ge2 orders antiferromagnetically at T-N1 = 5.5(1) K, followed by a spin-reorientation at T-N2 = 3.5 K. A metamagnetic step occurs around 20 kOe in the 4 K magnetization isotherm.},
  author       = {Schellenberg, Inga and Hermes, Wilfried and Lidin, Sven and Poettgen, Rainer},
  issn         = {0044-2968},
  keyword      = {Intermetallics,Europium,Mossbauer spectroscopy,Antiferromagnetic,transition},
  language     = {eng},
  number       = {3},
  pages        = {214--218},
  publisher    = {Oldenbourg Verlag},
  series       = {Zeitschrift für Kristallographie},
  title        = {Structure and properties of the 5.5 K antiferromagnet EuAu2Ge2},
  url          = {http://dx.doi.org/10.1524/zkri.2011.1317},
  volume       = {226},
  year         = {2011},
}