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Superconductivity and Dirac fermions in 112-phase pnictides

Ray, Soumya J. and Alff, Lambert (2017):
Superconductivity and Dirac fermions in 112-phase pnictides.
In: physica status solidi (b), WILEY-VCH, Weinheim, p. 1600163, 254, (1), ISSN 03701972, [Online-Edition: http://doi.org/10.1002/pssb.201600163],
[Article]

Abstract

This article reviews the current research on the 112-phase of pnictides. The 112-phase has gained augmented attention due to the recent discovery of high-temperature superconductivity in math formula with a maximum critical temperature math formula upon Sb substitution. The structural, magnetic, and electronic properties of math formula bear some similarities with other superconducting pnictide phases, however, the different valence states of the pnictogen and the presence of a metallic spacer layer are unique features of the 112-system. Low-temperature superconductivity which coexists with antiferromagnetic order was observed in transition metal (Ni, Pd) deficient 112-compounds like math formula, math formula, math formula, math formula. Besides superconductivity, the presence of naturally occurring anisotropic Dirac Fermionic states were observed in the layered 112-compounds SrMnBi2, CaMnBi2, LaAgBi2 which are of significant interest for future nanoelectronics as an alternative to graphene. In these compounds, the linear energy dispersion resulted in a high magnetoresistance that stayed unsaturated even at the highest applied magnetic fields. Here, we describe various 112-type materials systems combining experimental results and theoretical predictions to stimulate further research on this less well-known member of the pnictide family.

Item Type: Article
Erschienen: 2017
Creators: Ray, Soumya J. and Alff, Lambert
Title: Superconductivity and Dirac fermions in 112-phase pnictides
Language: English
Abstract:

This article reviews the current research on the 112-phase of pnictides. The 112-phase has gained augmented attention due to the recent discovery of high-temperature superconductivity in math formula with a maximum critical temperature math formula upon Sb substitution. The structural, magnetic, and electronic properties of math formula bear some similarities with other superconducting pnictide phases, however, the different valence states of the pnictogen and the presence of a metallic spacer layer are unique features of the 112-system. Low-temperature superconductivity which coexists with antiferromagnetic order was observed in transition metal (Ni, Pd) deficient 112-compounds like math formula, math formula, math formula, math formula. Besides superconductivity, the presence of naturally occurring anisotropic Dirac Fermionic states were observed in the layered 112-compounds SrMnBi2, CaMnBi2, LaAgBi2 which are of significant interest for future nanoelectronics as an alternative to graphene. In these compounds, the linear energy dispersion resulted in a high magnetoresistance that stayed unsaturated even at the highest applied magnetic fields. Here, we describe various 112-type materials systems combining experimental results and theoretical predictions to stimulate further research on this less well-known member of the pnictide family.

Journal or Publication Title: physica status solidi (b)
Volume: 254
Number: 1
Publisher: WILEY-VCH, Weinheim
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2017 08:26
Official URL: http://doi.org/10.1002/pssb.201600163
Identification Number: doi:10.1002/pssb.201600163
Funders: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through Grant No. SPP 1458 (LA 560/10-2).
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