Project

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Crystal growth, structural and physical investigations of novel superconductors and related compounds.

Applicant Magrez Arnaud
Number 156012
Funding scheme Project funding
Research institution Laboratoire de nanostructures et nouveaux matériaux électroniques EPFL - SB - IPMC - LNNME
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.01.2016 - 31.12.2016
Approved amount 129'300.00
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All Disciplines (2)

Discipline
Condensed Matter Physics
Physical Chemistry

Keywords (3)

superconductivity; high pressure; crystal growth

Lay Summary (French)

Lead
Croissance cristalline et investigations structurale et physique de nouveaux supraconducteurs et de composés dérivés.
Lay summary

Nous allons procéder à une recherche dans la synthèse de nouveaux matériaux, dans la croissance de monocristaux et dans l'étude des propriétés physiques et structurales de nouveaux supraconducteurs.

Nos objectifs concernent l'étude de composé apparentés à FeAs qui présente une structure anisotrope.

Nous étudierons l'influence de substitutions chimiques sur les propriétés supraconductrices des matériaux. La substitution d'une faible quantité d'éléments chimiques dans la structure peut entrainer une variation du nombre d'électrons, la création de défauts, ou une modification de la structure électronique qui pourrait conduire à une augmentation du champ critique au delà duquel l'état supraconducteur disparait. 

 

Direct link to Lay Summary Last update: 12.11.2015

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Magnetism of PrFeAsO parent compound for iron-based superconductors: Mössbauer spectroscopy study
K. Komedera (2017), Magnetism of PrFeAsO parent compound for iron-based superconductors: Mössbauer spectroscopy study, in Journal of Alloys and Compounds, 1.
42214 layered Fe-based superconductors: An ab initio study of their structural, magnetic, and electronic properties
F. Bucci et al. (2016), 42214 layered Fe-based superconductors: An ab initio study of their structural, magnetic, and electronic properties, in Phys Rev B, 024518.
Magnetotransport studies of superconducting Pr4Fe2As2Te1-xO4
A. Pisoni et al. (2016), Magnetotransport studies of superconducting Pr4Fe2As2Te1-xO4, in Phys Rev B, 094519.
Single crystals of superconducting SmFeAsOHx: Structure and properties
A. Pisoni et al. (2016), Single crystals of superconducting SmFeAsOHx: Structure and properties, in Phys Rev B, 024525.
Upper critical field, pressure-dependent superconductivity and electronic anisotropy of Sm4Fe2As2Te1−x O4−y F y
A. Pisoni et al. (2016), Upper critical field, pressure-dependent superconductivity and electronic anisotropy of Sm4Fe2As2Te1−x O4−y F y, in J. Phys.: Condens. Matter, 115701.

Associated projects

Number Title Start Funding scheme
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP

Abstract

The high pressure materials synthesis laboratory has been established in 2012-2013 in the Institute of Condensed Matter Physics (ICMP) in EPFL Lausanne. This laboratory was developed with the support of SNF and European Union Super Iron Projects and together with Crystal Growth Facility at ICMP is a platform for discovery and crystal growth of new electronic materials. Our high pressure equipment allows to synthesize ceramic materials and to grow single crystals at extreme conditions, i.e. pressure up to 3.5 GPa and temperature up to 1800 ° C. At such conditions new compounds have been synthesized [1, 2, 3, 4]. In the frame of these studies new family of superconductors has been discovered Ln4Fe2As2Te1-xO4 (Ln = Pr, Sm, Gd), which have new crystal structure type with the unique atomic arrangement unknown before and reveals relatively high (45 K) Tc.Also we grew crystals of a new compound: Pr7O4(BO3)3S1-xO3 which is an effective second harmonic generator with very high (tera-ohm) resistivity and has also a unique atomic arrangement (it is thus a new structure type).We apply for SNF support as the financial part of European-Japanese project “Exploring the potential of Iron-based Superconductors”, which last year basically supported activity of our high pressure lab, is closed on 31.09.2014. We will proceed with our investigations on the synthesis, crystal growth, physical and structure properties of novel superconductors and related compounds. Our aims are synthesis and investigations of structural and physical properties of single crystals and polycrystalline samples of strongly anisotropic compounds of high temperature superconductors, including novel superconductors, FeAs based and related compounds. Important part of our studies is search for new compounds which can show interesting physical and especially superconducting properties.The study of the influence of chemical substitutions on the superconducting properties is also the aim of the project. By substituting a small amount of foreign elements in the structure one can vary the electron count, create defects or modify the electronic structure leading to an increase of the upper critical field Hc2, critical current or critical temperature and variation of other superconducting parameters. Both chemical and structural subtleties can play a decisive role, and require a thorough and systematic study.We will also perform systematic search for new superconductors. In addition to our own investigations of the materials, we also collaborate with many laboratories, both in Switzerland and around the world.
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