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Title: TaRh 2B 2 and NbRh 2B 2: Superconductors with a chiral noncentrosymmetric crystal structure

Abstract

It is a fundamental truth in solid compounds that the physical properties follow the symmetry of the crystal structure. Nowhere is the effect of symmetry more pronounced than in the electronic and magnetic properties of materials—even the projection of the bulk crystal symmetry onto different crystal faces is known to have a substantial impact on the surface electronic states. The effect of bulk crystal symmetry on the properties of superconductors is widely appreciated, although its study presents substantial challenges. The effect of a lack of a center of symmetry in a crystal structure, for example, has long been understood to necessitate that the wave function of the collective electron state that gives rise to superconductivity has to be more complex than usual. However, few nonhypothetical materials, if any, have actually been proven to display exotic superconducting properties as a result. We introduce two new superconductors that in addition to having noncentrosymmetric crystal structures also have chiral crystal structures. Because the wave function of electrons in solids is particularly sensitive to the host material’s symmetry, crystal structure chirality is expected to have a substantial effect on their superconducting wave functions. Our two experimentally obtained chiral noncentrosymmetric superconducting materials have transition temperaturesmore » to superconductivity that are easily experimentally accessible, and our basic property characterization suggests that their superconducting properties may be unusual. We propose that their study may allow for a more in-depth understanding of how chirality influences the properties of superconductors and devices that incorporate them.« less

Authors:
 [1];  [2];  [3]; ORCiD logo [1];  [3]; ORCiD logo [3]; ORCiD logo [1];  [1]
  1. Princeton Univ., NJ (United States)
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Gdansk University of Technology (Poland)
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Centre (NCN), Krakow (Poland); National Science Foundation (NSF)
OSTI Identifier:
1499941
Alternate Identifier(s):
OSTI ID: 1595082
Grant/Contract Number:  
FG02-98ER45706
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 4; Journal Issue: 5; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Carnicom, Elizabeth M., Xie, Weiwei, Klimczuk, Tomasz, Lin, Jingjing, Górnicka, Karolina, Sobczak, Zuzanna, Ong, Nai Phuan, and Cava, Robert J. TaRh2B2 and NbRh2B2: Superconductors with a chiral noncentrosymmetric crystal structure. United States: N. p., 2018. Web. doi:10.1126/sciadv.aar7969.
Carnicom, Elizabeth M., Xie, Weiwei, Klimczuk, Tomasz, Lin, Jingjing, Górnicka, Karolina, Sobczak, Zuzanna, Ong, Nai Phuan, & Cava, Robert J. TaRh2B2 and NbRh2B2: Superconductors with a chiral noncentrosymmetric crystal structure. United States. doi:10.1126/sciadv.aar7969.
Carnicom, Elizabeth M., Xie, Weiwei, Klimczuk, Tomasz, Lin, Jingjing, Górnicka, Karolina, Sobczak, Zuzanna, Ong, Nai Phuan, and Cava, Robert J. Fri . "TaRh2B2 and NbRh2B2: Superconductors with a chiral noncentrosymmetric crystal structure". United States. doi:10.1126/sciadv.aar7969. https://www.osti.gov/servlets/purl/1499941.
@article{osti_1499941,
title = {TaRh2B2 and NbRh2B2: Superconductors with a chiral noncentrosymmetric crystal structure},
author = {Carnicom, Elizabeth M. and Xie, Weiwei and Klimczuk, Tomasz and Lin, Jingjing and Górnicka, Karolina and Sobczak, Zuzanna and Ong, Nai Phuan and Cava, Robert J.},
abstractNote = {It is a fundamental truth in solid compounds that the physical properties follow the symmetry of the crystal structure. Nowhere is the effect of symmetry more pronounced than in the electronic and magnetic properties of materials—even the projection of the bulk crystal symmetry onto different crystal faces is known to have a substantial impact on the surface electronic states. The effect of bulk crystal symmetry on the properties of superconductors is widely appreciated, although its study presents substantial challenges. The effect of a lack of a center of symmetry in a crystal structure, for example, has long been understood to necessitate that the wave function of the collective electron state that gives rise to superconductivity has to be more complex than usual. However, few nonhypothetical materials, if any, have actually been proven to display exotic superconducting properties as a result. We introduce two new superconductors that in addition to having noncentrosymmetric crystal structures also have chiral crystal structures. Because the wave function of electrons in solids is particularly sensitive to the host material’s symmetry, crystal structure chirality is expected to have a substantial effect on their superconducting wave functions. Our two experimentally obtained chiral noncentrosymmetric superconducting materials have transition temperatures to superconductivity that are easily experimentally accessible, and our basic property characterization suggests that their superconducting properties may be unusual. We propose that their study may allow for a more in-depth understanding of how chirality influences the properties of superconductors and devices that incorporate them.},
doi = {10.1126/sciadv.aar7969},
journal = {Science Advances},
number = 5,
volume = 4,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
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Cited by: 16 works
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Figures / Tables:

Fig. 1. Fig. 1.: Crystal structure characterization of TaRh2B2 and NbRh2B2. (A) Room temperature pXRD pattern showing a LeBail fit for the new superconducting phases TaRh2B2 (top) and NbRh2B2 (bottom). The experimentally observed data are shown with red circles, the calculated pattern is shown with a black line, and the green verticalmore » marks indicate the expected Bragg reflections for space group P31 (no. 144). Impurity peaks are marked with asterisks. (B) The crystal structure of chiral and noncentrosymmetric TaRh2B2 and isostructural NbRh2B2 viewed along the a direction, emphasizing the 31 screw axis (top) and along the c direction (bottom), emphasizing the Ta spirals and a single Rh honeycomb layer. Tantalum/niobium is shown in blue, rhodium is shown in pink, and boron is shown in green. arb. units, arbitrary units.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.