English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Unusual Mixed Valence of Eu in Two Materials - EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Haque, Z., Thakur, G. S., Parthasarathy, R., Gerke, B., Block, T., Heletta, L., et al. (2017). Unusual Mixed Valence of Eu in Two Materials - EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations. Inorganic Chemistry, 56(6), 3182-3189. doi:10.1021/acs.inorgchem.6b01926.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-222C-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C6C9-E
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Haque, Zeba1, Author
Thakur, Gohil Singh2, Author              
Parthasarathy, Rangasamy1, Author
Gerke, Birgit1, Author
Block, Theresa1, Author
Heletta, Lukas1, Author
Pottgen, Rainer1, Author
Joshi, Amish G.1, Author
Selvan, Ganesan Kalai1, Author
Arumugam, Sonachalam1, Author
Gupta, Laxmi Chand1, Author
Ganguli, Ashok Kumar1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

Content

show
hide
Free keywords: -
 Abstract: We have synthesized two new Eu-based compounds, EuSr2Bi2S4F4 and Eu2SrBi2S4F4, which are derivatives of Eu3Bi2S4F4, an intrinsic superconductor with I-c = 1.5 K. They belong to a tetragonal structure (SG: I4/mmm, Z = 2), similar to the parent compound Eu3Bi2S4F4. Our structural and Eu-151 Mossbauer spectroscopy studies show that, in EuSr2Bi2S4F4, Eu-atoms exclusively occupy the crystallographic 2a -sites. In Eu2SrBi2S4F4, 2a -sites are fully occupied by Eu-atoms and the other half of Eu-atoms and Sr -atoms together fully occupy 4e -sites in a statistical distribution. In both compounds Eu atoms occupying the crystallographic 2a -sites are in a homogeneous mixed valent state similar to 2.6-2.7. From our magnetization studies in an applied H <= 9 T, we infer that the valence of Eu-atoms in Eu2SrBi2S4F4 at the 2a -sites exhibits a shift toward 2+. Our XPS studies corroborate the occurrence of valence fluctuations of Eu and after Ar-ion sputtering show evidence of enhanced population of Eu2+-states. Resistivity measurements, down to 2 K, suggest a semimetallic nature for both compounds.

Details

show
hide
Language(s): eng - English
 Dates: 2017-02-282017-02-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 56 (6) Sequence Number: - Start / End Page: 3182 - 3189 Identifier: ISSN: 0020-1669
CoNE: /journals/resource/0020-1669