Combined experimental and theoretical studies of pressure effects in La2Sb

Stephan Knöner, Elena Gati, Bernd Wolf, Mariano de Souza, Amir Haghighirad, Markus Kuhnt, Wolf Assmus, Harald Olaf Jeschke, Milan Tomić, Roser Valentí, Michael Lang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The 5 K superconductor La2Sb shares some structural similarities with the iron-pnictides and -chalgogenides, especially the so-called 122-compounds, despite lacking a 3d-metal component. In order to look for similarities and dissimilarities of this layered metal pnictide with the higher- Tc Fe-based superconductors, we have performed a combined experimental and theoretical investigation of the effects of hydrostatic pressure. Magnetic measurements reveal a linear increase of Tc with pressure at a rate dc/dP = (0.71 ± 0.01)KGPa−1. Band structure calculations show that (i) the states at the Fermi level have predominantly La 5d character and (ii) that the density of states increases linearly with increasing pressure. By using these theoretical results and a BCS formalism, a quantitative description of the experimentally revealed pressure dependence of Tc is possible within a reasonable range of parameters. Our results indicate that La2Sb, despite its structural similarities to the 122 Fe-based superconductors, exhibits a BCS-type of superconductivity.

Original languageEnglish
Article number1600168
JournalPhysica Status Solidi (B) Basic Research
Volume254
Issue number1
DOIs
Publication statusPublished - Jan 1 2017
Externally publishedYes

Fingerprint

Pressure effects
pressure effects
Group 5A compounds
Metals
Magnetic variables measurement
Hydrostatic pressure
Superconductivity
Fermi level
hydrostatic pressure
Band structure
metals
pressure dependence
Superconducting materials
magnetic measurement
superconductivity
Iron
formalism
iron
Iron-based Superconductors

Keywords

  • Sb
  • iron pnictides
  • pressure effects
  • superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Knöner, S., Gati, E., Wolf, B., de Souza, M., Haghighirad, A., Kuhnt, M., ... Lang, M. (2017). Combined experimental and theoretical studies of pressure effects in La2Sb. Physica Status Solidi (B) Basic Research, 254(1), [1600168]. https://doi.org/10.1002/pssb.201600168

Combined experimental and theoretical studies of pressure effects in La2Sb. / Knöner, Stephan; Gati, Elena; Wolf, Bernd; de Souza, Mariano; Haghighirad, Amir; Kuhnt, Markus; Assmus, Wolf; Jeschke, Harald Olaf; Tomić, Milan; Valentí, Roser; Lang, Michael.

In: Physica Status Solidi (B) Basic Research, Vol. 254, No. 1, 1600168, 01.01.2017.

Research output: Contribution to journalArticle

Knöner, S, Gati, E, Wolf, B, de Souza, M, Haghighirad, A, Kuhnt, M, Assmus, W, Jeschke, HO, Tomić, M, Valentí, R & Lang, M 2017, 'Combined experimental and theoretical studies of pressure effects in La2Sb', Physica Status Solidi (B) Basic Research, vol. 254, no. 1, 1600168. https://doi.org/10.1002/pssb.201600168
Knöner, Stephan ; Gati, Elena ; Wolf, Bernd ; de Souza, Mariano ; Haghighirad, Amir ; Kuhnt, Markus ; Assmus, Wolf ; Jeschke, Harald Olaf ; Tomić, Milan ; Valentí, Roser ; Lang, Michael. / Combined experimental and theoretical studies of pressure effects in La2Sb. In: Physica Status Solidi (B) Basic Research. 2017 ; Vol. 254, No. 1.
@article{9940877d010c4274827783fbaed2b93b,
title = "Combined experimental and theoretical studies of pressure effects in La2Sb",
abstract = "The 5 K superconductor La2Sb shares some structural similarities with the iron-pnictides and -chalgogenides, especially the so-called 122-compounds, despite lacking a 3d-metal component. In order to look for similarities and dissimilarities of this layered metal pnictide with the higher- Tc Fe-based superconductors, we have performed a combined experimental and theoretical investigation of the effects of hydrostatic pressure. Magnetic measurements reveal a linear increase of Tc with pressure at a rate dc/dP = (0.71 ± 0.01)KGPa−1. Band structure calculations show that (i) the states at the Fermi level have predominantly La 5d character and (ii) that the density of states increases linearly with increasing pressure. By using these theoretical results and a BCS formalism, a quantitative description of the experimentally revealed pressure dependence of Tc is possible within a reasonable range of parameters. Our results indicate that La2Sb, despite its structural similarities to the 122 Fe-based superconductors, exhibits a BCS-type of superconductivity.",
keywords = "Sb, iron pnictides, pressure effects, superconductivity",
author = "Stephan Kn{\"o}ner and Elena Gati and Bernd Wolf and {de Souza}, Mariano and Amir Haghighirad and Markus Kuhnt and Wolf Assmus and Jeschke, {Harald Olaf} and Milan Tomić and Roser Valent{\'i} and Michael Lang",
year = "2017",
month = "1",
day = "1",
doi = "10.1002/pssb.201600168",
language = "English",
volume = "254",
journal = "Physica Status Solidi (B): Basic Research",
issn = "0370-1972",
publisher = "Wiley-VCH Verlag",
number = "1",

}

TY - JOUR

T1 - Combined experimental and theoretical studies of pressure effects in La2Sb

AU - Knöner, Stephan

AU - Gati, Elena

AU - Wolf, Bernd

AU - de Souza, Mariano

AU - Haghighirad, Amir

AU - Kuhnt, Markus

AU - Assmus, Wolf

AU - Jeschke, Harald Olaf

AU - Tomić, Milan

AU - Valentí, Roser

AU - Lang, Michael

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The 5 K superconductor La2Sb shares some structural similarities with the iron-pnictides and -chalgogenides, especially the so-called 122-compounds, despite lacking a 3d-metal component. In order to look for similarities and dissimilarities of this layered metal pnictide with the higher- Tc Fe-based superconductors, we have performed a combined experimental and theoretical investigation of the effects of hydrostatic pressure. Magnetic measurements reveal a linear increase of Tc with pressure at a rate dc/dP = (0.71 ± 0.01)KGPa−1. Band structure calculations show that (i) the states at the Fermi level have predominantly La 5d character and (ii) that the density of states increases linearly with increasing pressure. By using these theoretical results and a BCS formalism, a quantitative description of the experimentally revealed pressure dependence of Tc is possible within a reasonable range of parameters. Our results indicate that La2Sb, despite its structural similarities to the 122 Fe-based superconductors, exhibits a BCS-type of superconductivity.

AB - The 5 K superconductor La2Sb shares some structural similarities with the iron-pnictides and -chalgogenides, especially the so-called 122-compounds, despite lacking a 3d-metal component. In order to look for similarities and dissimilarities of this layered metal pnictide with the higher- Tc Fe-based superconductors, we have performed a combined experimental and theoretical investigation of the effects of hydrostatic pressure. Magnetic measurements reveal a linear increase of Tc with pressure at a rate dc/dP = (0.71 ± 0.01)KGPa−1. Band structure calculations show that (i) the states at the Fermi level have predominantly La 5d character and (ii) that the density of states increases linearly with increasing pressure. By using these theoretical results and a BCS formalism, a quantitative description of the experimentally revealed pressure dependence of Tc is possible within a reasonable range of parameters. Our results indicate that La2Sb, despite its structural similarities to the 122 Fe-based superconductors, exhibits a BCS-type of superconductivity.

KW - Sb

KW - iron pnictides

KW - pressure effects

KW - superconductivity

UR - http://www.scopus.com/inward/record.url?scp=84980378561&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84980378561&partnerID=8YFLogxK

U2 - 10.1002/pssb.201600168

DO - 10.1002/pssb.201600168

M3 - Article

AN - SCOPUS:84980378561

VL - 254

JO - Physica Status Solidi (B): Basic Research

JF - Physica Status Solidi (B): Basic Research

SN - 0370-1972

IS - 1

M1 - 1600168

ER -