Electronic structure and superconductivity in metal hexaborides

Schell, G.; Winter, H.; Rietschel, H.; Gompf, F.

doi:10.1103/physrevb.25.1589

Cited by 101 publications

(58 citation statements)

References 23 publications

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“…Our estimates λ = 0.17-0.26 are somewhat lower than a calculated value of 0.33 [31] and the estimated electron relaxation frequency Γ ~ 260 cm -1 is twice as high as the values obtained from the optical measure ments [32]. Comparison of the experimental and cal culated spectra confirms that the observed scattering is determined by intraband electronic excitations and the electron-phonon interaction is the main mecha nism of the renormalization of the energies of elec trons.…”

Section: Ponosov Strel'tsovcontrasting

confidence: 43%

Q-dependent light scattering by electrons in LaB6

Ponosov

Streltsov

2013

Jetp Lett.

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Section: Ponosov Strel'tsovcontrasting

confidence: 43%

Q-dependent light scattering by electrons in LaB6

Ponosov

Streltsov

2013

Jetp Lett.

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“…21 Considering these similarities in the crystal dynamics and electronic structures, the large difference in the superconducting transition temperature in LaB 6 and YB 6 , and ZrB 12 and LuB 12 pairs appears incomprehensible. The hexaborides have been studied by Schell et al 22 but up until now the dodecaborides have not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison ofLuB12withZrB12
Teyssier
¹
,
Lortz
²
,
Petrović
³

et al. 2008
Phys. Rev. B
47
4
41
0
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We report a detailed study of specific heat, electrical resistivity, and optical spectroscopy in the superconducting boride LuB 12 ͑T c = 0.4 K͒, and compare it to the higher T c compound ZrB 12 ͑T c =6 K͒. Both compounds have the same structure based on enclosed metallic Lu or Zr ions in oversized boron cages. The infrared reflectivity and ellipsometry in the visible range allow us to extract the optical conductivity from 6 meV to 4 eV in the normal state from 20 to 280 K. By extracting the superconducting properties, phonon density of states, and electron-phonon coupling function from these measurements, we discuss the important factors governing T c and explain the difference between the two compounds. The phonon density of states seems to be insignificantly modified by substitution of Zr with Lu. However, the soft vibrations of the metal ions in boron cages, responsible for the relatively high T c in ZrB 12 , have almost no contribution to the electron-phonon coupling in LuB 12 .

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“…Also, high-quality single crystals with 0.75 < x < 1 will allow us to scrutinize the existence of a putative QCP and its possible conjunction with the SC which emerges as x approaches to unity. 34 We expect an identification of the role of multipolar fluctuations in forming SC will greatly expand our knowledge regarding multipolar QCP beyond what we know from recently discovered SC emerging from pressuretuned quadrupolar QCP in PrTi 2 Al 20 10 and field-induced quadrupolar QCP in PrV 2 Al 20 .…”

Section: Discussionmentioning

confidence: 99%

“…[31][32][33] Furthermore, recent discoveries of superconductivity (SC) near quadrupolar quantum critical point (QCP) 10,11 strongly motivate researchers to investigate one of unresolved problems about the relation between the substitution-tuned multipolar QCP and proximate competing order parameters, including SC that occurs on the La-rich side in Ce 1−x La x B 6 . 34 By convention for naming primary order parameters, the spin/pseudospin (orbital) paramagnetic (PM) phase, the AFQ phase, the AFM phase, and the AFO phase are referred to as phases I, II, III, and IV, respectively.…”

Section: Introductionmentioning

confidence: 99%

Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1 − x La x B6

Jang¹,

Portnichenko²,

Cameron³

et al. 2017

npj Quant Mater

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For the last few decades, researchers have been intrigued by multipolar ordering phenomena and related quantum phase transitions in heavy-fermion Kondo systems. However, a criticality induced by substitution level (x), temperature (T), or magnetic field (B) is poorly understood even in the prototypical material, Ce1−x La x B6, despite a large collection of experimental results is available. In this work, we present T–B, x–T, and x–B phase diagrams of Ce1−x La x B6 (B || [110]). These are completed by investigating heat capacity, magnetocaloric effect (MCE), and elastic neutron scattering. A drastic increase of the Sommerfeld coefficient γ0, which is estimated from the heat capacity down to 0.05 K, is observed with increasing x. The precise T–B phase diagram including a high-entropy region is derived from the MCE analysis in which a knowledge beyond the equilibrium thermodynamics is involved. Finally, the x–B phase diagram at T = 0, which supports the existence of a quantum critical point at x > 0.75, is obtained by the same analysis. A detailed interpretation of phase diagrams strongly indicates positive correlation between the fluctuating multipoles and the effective electron mass.

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Electronic structure and superconductivity in metal hexaborides

Cited by 101 publications

References 23 publications

Q-dependent light scattering by electrons in LaB6

Q-dependent light scattering by electrons in LaB6

Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison ofLuB12withZrB12
Teyssier
¹
,
Lortz
²
,
Petrović
³

et al. 2008
Phys. Rev. B
47
4
41
0
View full text Add to dashboard Cite

Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1 − x La x B6

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Electronic structure and superconductivity in metal hexaborides

Cited by 101 publications

References 23 publications

Q-dependent light scattering by electrons in LaB6

Q-dependent light scattering by electrons in LaB6

Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison ofLuB12withZrB12Teyssier1, Lortz2, Petrović3 et al. 2008Phys. Rev. B474410View full textAdd to dashboardCite

Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1 − x La x B6

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Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison ofLuB12withZrB12
Teyssier
¹
,
Lortz
²
,
Petrović
³

et al. 2008
Phys. Rev. B
47
4
41
0
View full text Add to dashboard Cite