Crystal Structure and High-Temperature Thermoelectric Properties of the Mo3−x Ru x Sb7 Compounds

Candolfi, Christophe; Leszczyński, Juliusz; Masschelein, Philippe; Chubilleau, Caroline; Lenoir, Bertrand; Dauscher, A.; Guilmeau, Emmanuel; Clarke, Simon J.; Smith, Ron

doi:10.1007/s11664-009-0981-2

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…[14][15][16][17] Electronic structure calculations suggest a rigid-band behavior, where Te or Ru doping moves the Fermi level toward the valence band edge. This is supported by the observation that Mo 3 Sb 7 changes from a paramagnetic metal to a diamagnetic semiconductor with increasing Te or Ru doping.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of Te/Ru doping at high doping concentrations for Mo 3−x Ru x Sb 7 (x≥0.25, 0.50, and 1.0), and Mo 3 Sb 7−x Te x (x≥0.30, 1.0, 1.60, and 2.2) has been studied both experimentally and theoretically. [14][15][16][17] Electronic structure calculations suggest a rigid-band behavior, where Te or Ru doping moves the Fermi level toward the valence band edge. This is supported by the observation that Mo 3 Sb 7 changes from a paramagnetic metal to a diamagnetic semiconductor with increasing Te or Ru doping.…”

Section: Introductionmentioning

confidence: 99%

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Fragile structural transition inMo3Sb7

Yan¹,

McGuire²,

May³

et al. 2015

Phys. Rev. B

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Mo3Sb7 single crystals lightly doped with Cr, Ru, or Te are studied in order to explore the interplay between superconductivity, magnetism, and the cubic-tetragonal structural transition. The structural transition at 53 K is extremely sensitive to Ru or Te substitution which introduce additional electrons, but robust against Cr substitution. No sign of a structure transition was observed in superconducting Mo2.91Ru0.09Sb7 and Mo3Sb6.975Te0.025. In contrast, 3at% Cr doping only slightly suppresses the structural transition to 48 K while leaving no trace of superconductivity above 1.8 K. Analysis of magnetic properties suggests that the interdimer interaction in Mo3Sb7 is near a critical value and essential for the structural transition. All dopants suppress the superconductivity of Mo3Sb7. The tetragonal structure is not necessary for superconductivity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fragile structural transition inMo3Sb7

Yan¹,

McGuire²,

May³

et al. 2015

Phys. Rev. B

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“…[6][7][8][9] Mo 3 Sb 7 is the only known compound in the Mo-Sb binary system. It crystallizes in the Ir 3 Ge 7 -type cubic structure with space group Im3m at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Flux growth and physical properties of Mo3Sb7single crystals

et al. 2013

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Millimeter sized single crystals of Mo 3 Sb 7 are grown using the self-flux technique and a thorough characterization of their structural, magnetic, thermal, and transport properties is reported. The structure parameters for the high-temperature cubic phase and the low-temperature tetragonal phase were determined with neutron single crystal diffraction. Both x-ray powder diffraction and neutron single crystal diffraction at room temperature confirmed that Mo 3 Sb 7 crystallizes in Ir 3 Ge 7 -type cubic structure with space group Im3m. The cubic-tetragonal structure transition at 53 K is verified by the peak splitting of (4 0 0) reflection observed by x-ray single crystal diffraction and the dramatic intensity change of the (12 0 0) peak observed by neutron single crystal diffraction. The structural transition is accompanied by a sharp drop in magnetic susceptibility, electrical resistivity, and thermopower while cooling. A weak lambda anomaly was also observed around 53 K in the temperature dependence of specific heat, and the entropy change across the transition is estimated to be 1.80 J/mol Mo K. The temperature dependence of magnetic susceptibility was measured up to 750 K, and it follows a Curie-Weiss behavior above room temperature. Analysis of the low-temperature magnetic susceptibility suggests a spin gap of 110 K around 53 K. A typical phonon thermal conductivity was observed in the low temperature tetragonal phase. A glassy phonon thermal conductivity above 53 K suggests a structural instability in a wide temperature range. Superconductivity was observed at 2.35 K in the as-grown crystals, and the dimensionless specific heat jump C(T )/γ n T c was determined to be 1.49, which is slightly larger than the BCS value of 1.43 for the weak-coupling limit.

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“…Despite a relatively low superconducting transition temperature T c = 2.08 K, [1] the Zintl compound Mo 3 Sb 7 has attracted considerable interest due to the possible involvement of magnetism in superconducting pairing, [2][3][4][5] and promising thermoelectric performance with proper doping. [6][7][8][9] Mo 3 Sb 7 is the only known compound in the Mo-Sb binary system. It crystallizes in a Ir 3 Ge 7 -type cubic structure with space group Im3m at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Flux growth and physical properties of Mo3Sb7 single crystals

Yan,

McGuire,

May

et al. 2013

Preprint

View full text Add to dashboard Cite

Millimeter sized single crystals of Mo3Sb7 are grown using the self-flux technique and a thorough characterization of their structural, magnetic, thermal and transport properties is reported. The structure parameters for the high-temperature cubic phase and the low-temperature tetragonal phase were, for the first time, determined with neutron single crystal diffraction. Both X-ray powder diffraction and neutron single crystal diffraction at room temperature confirmed that Mo3Sb7 crystallizes in Ir3Ge7-type cubic structure with space group Im3m. The cubic-tetragonal structure transition at 53 K is verified by the peak splitting of (4 0 0) reflection observed by X-ray single crystal diffraction and the dramatic intensity change of (12 0 0) peak observed by neutron single crystal diffraction. The structural transition is accompanied by a sharp drop in magnetic susceptibility, electrical resistivity, and thermopower while cooling. A weak lambda anomaly was also observed around 53 K in the temperature dependence of specific heat and the entropy change across the transition is estimated to be 1.80 J/molMo K. The temperature dependence of magnetic susceptibility was measured up to 750 K and it follows a Curie-Weiss behavior above room temperature. Analysis of the low-temperature magnetic susceptibility suggests a spin gap of 110 K around 53 K. A typical phonon thermal conductivity was observed in the low temperature tetragonal phase. A glassy phonon thermal conductivity above 53 K suggests a structural instability in a wide temperature range. Superconductivity was observed at 2.35 K in the as-grown crystals and the dimensionless specific heat jump C(T)/γnTc was determined to be 1.49, which is slightly larger than the BCS value of 1.43 for the weak-coupling limit.

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Crystal Structure and High-Temperature Thermoelectric Properties of the Mo3−x Ru x Sb7 Compounds

Cited by 6 publications

References 16 publications

Fragile structural transition inMo3Sb7

Fragile structural transition inMo3Sb7

Flux growth and physical properties of Mo3Sb7single crystals

Flux growth and physical properties of Mo3Sb7 single crystals

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