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Title: Non-Centrosymmetric Topological Superconductivity

Abstract

We have pursued a joint experimental and theoretical effort to focus on understanding the topological superconducting state of the non-centrosymmetric half-Heusler family, with particular emphasis on the material YPtBi. We completed a thorough study of the palladium-based rare earth-bismuthide (RPdBi) half-Heusler family, synthesizing high-quality crystalline specimens and fully characterizing their normal, superconducting and magnetic states in an effort to reveal their potential for realizing the next generation of topological insulators and superconductors. We synthesized the series of heavy-R compounds, including Sm, Gd, Tb, Dy, Ho, Er, Tm magnetic rare earths as well as Y and Lu non-magnetic elements. Electrical resistivity and magnetic susceptibility measurements of the RPdBi series has been performed down to 20 mK temperatures, revealing an interesting progression of superconducting phase transitions that evolves with rare earth species. We have found that superconductivity exists in most of these compounds, with a maximum transition Tc = 1.6 K found in the non-magnetic Y- and Lu-based compounds, and is systematically suppressed with increasing strength of magnetism from the magnetic rare earth species. Neutron scattering experiments have confirmed long-ranged antiferromagnetic order which presents a representative scan of magnetic peaks in DyPdBi (TN=3.5 K) and the AFM order parameter in TbPdBi (TN=4.9more » K).« less

Authors:
 [1]
  1. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1507363
Report Number(s):
DOE-UMD-10605
DOE Contract Number:  
SC0010605
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Paglione, Johnpierre. Non-Centrosymmetric Topological Superconductivity. United States: N. p., 2019. Web. doi:10.2172/1507363.
Paglione, Johnpierre. Non-Centrosymmetric Topological Superconductivity. United States. https://doi.org/10.2172/1507363
Paglione, Johnpierre. 2019. "Non-Centrosymmetric Topological Superconductivity". United States. https://doi.org/10.2172/1507363. https://www.osti.gov/servlets/purl/1507363.
@article{osti_1507363,
title = {Non-Centrosymmetric Topological Superconductivity},
author = {Paglione, Johnpierre},
abstractNote = {We have pursued a joint experimental and theoretical effort to focus on understanding the topological superconducting state of the non-centrosymmetric half-Heusler family, with particular emphasis on the material YPtBi. We completed a thorough study of the palladium-based rare earth-bismuthide (RPdBi) half-Heusler family, synthesizing high-quality crystalline specimens and fully characterizing their normal, superconducting and magnetic states in an effort to reveal their potential for realizing the next generation of topological insulators and superconductors. We synthesized the series of heavy-R compounds, including Sm, Gd, Tb, Dy, Ho, Er, Tm magnetic rare earths as well as Y and Lu non-magnetic elements. Electrical resistivity and magnetic susceptibility measurements of the RPdBi series has been performed down to 20 mK temperatures, revealing an interesting progression of superconducting phase transitions that evolves with rare earth species. We have found that superconductivity exists in most of these compounds, with a maximum transition Tc = 1.6 K found in the non-magnetic Y- and Lu-based compounds, and is systematically suppressed with increasing strength of magnetism from the magnetic rare earth species. Neutron scattering experiments have confirmed long-ranged antiferromagnetic order which presents a representative scan of magnetic peaks in DyPdBi (TN=3.5 K) and the AFM order parameter in TbPdBi (TN=4.9 K).},
doi = {10.2172/1507363},
url = {https://www.osti.gov/biblio/1507363}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 01 00:00:00 EDT 2019},
month = {Mon Apr 01 00:00:00 EDT 2019}
}