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Superconductivity in Te-Deficient ZrTe2.

Lucas E Correa1, Pedro P Ferreira1,2, Leandro R de Faria1

  • 1Universidade de São Paulo, Escola de Engenharia de Lorena, DEMAR, 12612-550 Lorena, Brazil.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|March 24, 2023
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Summary

We discovered that a Te-deficient zirconium telluride (ZrTe1.8) exhibits superconductivity below 3.2 K. This defect-induced superconductivity is linked to electronic structure modifications, offering insights into novel superconducting materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity Research

Background:

  • Zirconium ditelluride (ZrTe2) is a nonsuperconducting material with a specific crystal structure.
  • Understanding the factors influencing superconductivity in related materials is crucial for discovering new superconductors.

Purpose of the Study:

  • To investigate the superconducting properties of Te-deficient ZrTe1.8 single crystals.
  • To elucidate the role of Te deficiency in modifying the electronic structure and promoting superconductivity.

Main Methods:

  • Growth of high-quality ZrTe1.8 single crystals using isothermal chemical vapor transport.
  • Measurements of structural, electrical, and thermoelectric properties.
  • Analysis of superconducting critical field using a two-gap superconducting model.
  • First-principles density functional theory (DFT) calculations.

Main Results:

  • ZrTe1.8 exhibits superconductivity below 3.2 K.
  • The upper critical field behavior deviates from single-band models, fitting a two-gap model.
  • Seebeck potential measurements indicate predominantly negative charge carriers.
  • DFT calculations reveal density of states peaks at the Fermi level due to localized Zr-d bands caused by Te deficiency.

Conclusions:

  • Te deficiency in ZrTe1.8 unexpectedly creates electronic instabilities at the Fermi level, enhancing superconductivity.
  • Defects can be strategically used to tune electronic structures for superconductivity.
  • ZrTe1.8 presents a promising system for exploring defect-engineered superconductors.