Electrical resistivity and superconductivity of LaB6 and LuB12

Baťko, I.; Baťková, M.; Flachbart, К.; Филиппов, В. Б.; Paderno, Yu. B.; Shicevalova, N.Yu.; Wagner, Th.

doi:10.1016/0925-8388(94)01351-9

Cited by 43 publications

(24 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A large electron-phonon ͑e-ph͒ coupling ͑quantified by , the e-ph coupling constant͒ exists in such covalent structures. In addition, the 28 Si / 30 Si isotope substitution and specific-heat measurements of Tanigaki et al 19 proved that a BCS-type phonon-mediated superconductivity occurs in such compounds. Furthermore, Toulemonde et al 20,21 showed that the role of caged alkaline earth atoms in M 8 Si 46 ͑M = Ba, Sr, and Ca͒ is essentially to provide carriers to the network and enhance the electronic density of states at the Fermi level N͑E F ͒, without affecting significantly the e-ph coupling potential V ep = / N͑E F ͒.…”

Section: Introductionmentioning

confidence: 99%

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

View full text Add to dashboard Cite

We report a detailed study of specific heat, electrical resistivity, and thermal expansion in combination with inelastic neutron and inelastic x-ray scattering to investigate the origin of superconductivity in the two silicon clathrate superconductors Ba 8 Si 46 and Ba 24 Si 100 . Both compounds have a similar structure based on encaged barium atoms in oversized silicon cages. However, the transition temperatures are rather different: 8 and 1.5 K, respectively. By extracting the superconducting properties, phonon density of states, electron-phonon coupling function, and phonon anharmonicity from these measurements, we discuss the important factors governing T c and explain the difference between the two compounds.

show abstract

Section: Introductionmentioning

confidence: 99%

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Phases II and IV are associated with the two multipolar phases with AFQ and octupolar ordering. The "SC" dome at the bottom-right corner schematically indicates the dubious superconducting phase of the pure LaB 6 [31,[48][49][50]. Phases III, V and VI are three different types of AFM ordering, realized in Ce 1−x Nd x B 6 .…”

Section: Introductionmentioning

confidence: 99%

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

We investigate the doping-induced changes in the electronic structure of CeB 6 on a series of substituted Ce 1−x R x B 6 samples (R = La, Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across the Brillouin zone, which we associate with the changes in the Fermi-surface nesting properties related to the modified charge carrier concentration. In particular, a strong diffuse peak at the corner of the Brillouin zone (R point), which coincides with the propagation vector of the elusive antiferroquadrupolar (AFQ) order in CeB 6 , is rapidly suppressed by both La and Nd doping, like the AFQ order itself. The corresponding spectral weight is transferred to the X (00 1 2 ) point, ultimately stabilizing a long-range AFM order at this wave vector at the Nd-rich side of the phase diagram. At an intermediate Nd concentration, a broad diffuse peak with multiple local maxima of intensity is observed around the X point, evidencing itinerant frustration that gives rise to multiple ordered phases for which Ce 1−x Nd x B 6 is known. On the La-rich side of the phase diagram, however, dilution of the magnetic moments prevents the formation of a similar (00 1 2 )-type order despite the presence of nesting. Our results demonstrate how diffuse neutron scattering can be used to probe the nesting vectors in complex f-electron systems directly, without reference to the single-particle band structure, and emphasize the role of Fermi surface geometry in stabilizing magnetic order in rare-earth hexaborides.

show abstract

“…3͒ and LuB 12 ͑T c = 0.44 K͒. 4,5 The two latter compounds belong to the rare-earth boride family, intensively studied because of their wide variety of physical properties: 6 valence fluctuations ͑SmB 6 and YbB 12 ͒, magnetic ordering ͑CeB 6 and HoB 12 ͒, and superconductivity ͑LaB 6 and LuB 12 ͒. Rare-earth hexa-and dodecaborides both exhibit structures based on oversized crystalline cages formed by a covalent 2p boron ions in which metal atoms are enclosed.…”

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
View full text Add to dashboard Cite

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 .

show abstract

Electrical resistivity and superconductivity of LaB6 and LuB12

Cited by 43 publications

References 8 publications

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

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

Contact Info

Product

Resources

About

Electrical resistivity and superconductivity of LaB6 and LuB12

Cited by 43 publications

References 8 publications

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46andLortz1, Viennois2, Petrović3 et al. 2008Phys. Rev. B

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46andLortz1, Viennois2, Petrović3 et al. 2008Phys. Rev. B

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and Nikitin1, Portnichenko2, Dukhnenko3 et al. 2018Phys. Rev. B123160View full textAdd to dashboardCite

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

Contact Info

Product

Resources

About

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46and
Lortz
¹
,
Viennois
²
,
Petrović
³

et al. 2008
Phys. Rev. B

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

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