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Spin fluctuations and superconductivity in Mo3Sb7.

C Candolfi1, B Lenoir, A Dauscher

  • 1Laboratoire de Physique des Matériaux, Nancy Université, CNRS, Ecole Nationale Supérieure des Mines de Nancy, Parc de Saurupt, 54042 Nancy cedex, France. christophe.candolfi@mines.inpl-nancy.fr

Physical Review Letters
|August 7, 2007
PubMed
Summary
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The Mo(3)Sb(7) compound shows superconductivity at 2.25 K and behaves as a heavy-fermion system. It is classified as a coexistent superconductor-spin fluctuation system, accurately modeled by the McMillan equation.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Mo(3)Sb(7) is a material with potential for unique electronic properties.
  • Understanding its magnetic and superconducting behavior is crucial for materials science.

Purpose of the Study:

  • To investigate the temperature-dependent magnetic susceptibility, specific heat, and electrical resistivity of Mo(3)Sb(7).
  • To classify Mo(3)Sb(7) as a heavy-fermion system and a coexistent superconductor-spin fluctuation system.
  • To evaluate the applicability of theoretical models like the McMillan equation.

Main Methods:

  • Measurements of magnetic susceptibility from 0.6-350 K.
  • Specific heat measurements in the 0.6-350 K range.
  • Electrical resistivity measurements across a wide temperature range.

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Main Results:

  • Bulk superconductivity was observed in Mo(3)Sb(7) at 2.25 K.
  • The compound follows the Kadowaki-Woods relation, characteristic of heavy-fermion systems.
  • Experimental and theoretical evidence classifies Mo(3)Sb(7) as a coexistent superconductor-spin fluctuation system.

Conclusions:

  • Mo(3)Sb(7) exhibits characteristics of both superconductivity and spin fluctuations.
  • The McMillan equation, incorporating paramagnon effects, accurately predicts the transition temperature.
  • This classification provides insights into the complex interplay of electronic phenomena in Mo(3)Sb(7).