## Abstract

The electrical resistivity and the thermoelectric power of Nb_{3}Te_{4} inserted with mercury have been measured in the temperature range from 1.4 to 300 K. The magnitude of the resistivity and the residual-resistivity ratio are not greatly affected by addition of Hg. The magnitude of the resistive anomaly at 90 K increases when adding a small amount of Hg but begins to decrease at about x = 0.03 and is no longer visible at about x = 0.15. Similarly, the magnitude of the resistive anomaly at 30 K decreases with increasing Hg concentration and disappears at about x = 0.26. The thermoelectric power S also shows two anomalies at about 90 and 30 K. The anomaly of S at 90 K becomes smeared by addition of Hg and disappears at about x = 0.3. The anomaly of S at 30 K becomes clear by addition of Hg and is still present at an amount of x = 0.8. The sign of S is negative at all measured temperatures for x<0.3 and is positive at temperatures below 7 K for x>0.3. The superconducting transition temperature is enhanced from 1.9 to 5.4 K by addition of Hg. The upper critical fields parallel (H_{c2∥}) and perpendicular (H_{c2⊥}) to the c axis have been measured near T_{C}. The critical fields show large anisotropy for x≥0.3: the ratio H_{c2∥}/H_{c2⊥} is about 5 for x<0.3 and 40 for x≥0.3. These results are discussed on the basis of the multiband model with electron-like and hole-like carriers and with phonon drag.

Original language | English |
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Pages (from-to) | 6373-6384 |

Number of pages | 12 |

Journal | Journal of Physics Condensed Matter |

Volume | 11 |

Issue number | 33 |

DOIs | |

State | Published - Aug 23 1999 |

## ASJC Scopus subject areas

- General Materials Science
- Condensed Matter Physics

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