class 5: other superconductorsseshadri/2012_286g/286g_05.pdf · class 5: other superconductors. the...
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![Page 1: Class 5: Other superconductorsseshadri/2012_286G/286G_05.pdf · Class 5: Other superconductors. The Chevrel phases (R. Chevrel, Université de Rennes) These compounds have a very](https://reader033.vdocuments.mx/reader033/viewer/2022042314/5f02d8a57e708231d4064ce7/html5/thumbnails/1.jpg)
Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
The A-15 compounds: Nb3Ge, Nb3Al etc. are still the most widely used materials in magnets. Table from Matthias, Rev. Mod. Phys. 35 (1963) 1.
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
The Chevrel phases (R. Chevrel, Université de Rennes)
These compounds have a very high Hc2 some other unusual properties such as magnetism co-existing with superconductivity.
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
Ordered C60 (left) and K3C60 (right)
![Page 4: Class 5: Other superconductorsseshadri/2012_286G/286G_05.pdf · Class 5: Other superconductors. The Chevrel phases (R. Chevrel, Université de Rennes) These compounds have a very](https://reader033.vdocuments.mx/reader033/viewer/2022042314/5f02d8a57e708231d4064ce7/html5/thumbnails/4.jpg)
Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
![Page 5: Class 5: Other superconductorsseshadri/2012_286G/286G_05.pdf · Class 5: Other superconductors. The Chevrel phases (R. Chevrel, Université de Rennes) These compounds have a very](https://reader033.vdocuments.mx/reader033/viewer/2022042314/5f02d8a57e708231d4064ce7/html5/thumbnails/5.jpg)
Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
The hexagonal double honeycomb compounds Lix[HfNCl]2. The Fermi surface at optimal doping resembles the High Tc cuprates.
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
MgB2 is isoelectronic and nearly isostructural with graphite. Its an electron-phonon superconductor with Tc near 30 K.
From Floris et al. Phys Rev. Lett. 94(2005) 037004.
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
Lu2Ni2B2C with a stuffed ThCr2Si2 structure is a family of superconductors with maximum Tc near 20 K.
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
MgNi3C
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Materials 286 G: Structural Families of Functional Inorganic MaterialsRam Seshadri, UCSB MRL, Room 3008, x6129 seshadri@mrl
Class 5: Other superconductors
Layered cobaltates: Add water !