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Questions tagged [superconductivity]

For questions related to superconductivity in materials.

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Can we calculate superconducting properties of materials using first-principle?

In his book Condensed Matter in a Nutshell, the late Gerald D. Mahan wrote that The calculation of a crystal's superconducting properties is not yet possible (p. 5). The book was published in 2010. ...
Abdul Muhaymin -Free Palestine's user avatar
2 votes
0 answers
51 views

Utilizing DFT-Computed Band Structures in Solid Physics to Investigate Superconductivity: Clues and Indicators in Band Structures

How can band structures and Fermi surfaces calculated with Density Functional Theory (DFT) be effectively employed in the study of superconductivity? What are the key features or indications related ...
Jaafar Mehrez's user avatar
2 votes
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BZ grid and susceptibility for numerical Pauli limit calculation

I am trying to calculate the Pauli limit for a superconducting material with Hamiltonian $H_0$ and an external magnetic field contribution $H_p$. I find the matsubara greens function as $\hat{G} = [i\...
gx824's user avatar
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4 votes
1 answer
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How to calculate the Eliashberg spectral function in VASP?

I want to calculate a superconducting critical temperature. I see in papers like this one: link that they calculate $T_c$ in Quantum Espresso. They use the formula (Eq. 2 in that paper): $$T_c=\frac{\...
Vladislav Gladkikh's user avatar
5 votes
0 answers
290 views

Electron-phonon coupling plotted as function of phonon bands [closed]

I'm looking to superimpose electron phonon coupling (EPC) constants per phonon band per k-point as is done in Figures 6c and 6d in this paper, essentially a "fat band" plot where the ...
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4 votes
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Can superconductivity be faked by using precise mathematics in a simulated circuit & specific materials in an actual circuit? [closed]

A type of electrical amplifier is proposed in which only magnetism and it’s analogous current exists for the most part. There is no voltage and no wattage (to speak of) in which electricity has to ...
Vinyasi's user avatar
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11 votes
1 answer
340 views

"Quantum protectorates" and the limits of grand unified theories

I've recently made myself more familiar with Laughlin and Pines' "quantum protectorate" arguments (1, 2), which seems built on Anderson's famous More is Different article (3). This does seem ...
tmph's user avatar
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10 votes
1 answer
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Nematicity in superconductors

It seems to me that the definition of "nematic phase" is quite chamaleonic. Quoting from its first definition [Nature 393, 550 (1998)] for a 2-dimensional square lattice "The nematic ...
gryphys's user avatar
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7 votes
1 answer
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Signatures of Competing Orders in Ab Initio Calculations

Some materials have various competing and/or synergistic orders, such as charge density waves and superconducting pairing. Are there signatures of such an interplay between orders that can be seen in ...
2ndQuantized's user avatar
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12 votes
0 answers
109 views

First principles calculations beyond s-wave BCS superconductors [closed]

Conventional superconductors are often modelled using Bardeen-Cooper-Schrieffer (BCS) theory with an s-wave order parameter, but not all superconductors describable with BCS theory have an s-wave ...
2ndQuantized's user avatar
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7 votes
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How are nematic phases modelled? [closed]

Nematic phases in superconducting materials are studied in both angular-resolved photoelectron spectroscopy (ARPES) and second harmonic generation (SHG) experiments. What techniques, if any, are used ...
2ndQuantized's user avatar
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3 votes
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How are pseudogap phases typically modelled? [closed]

Cuprate superconductors have a pseudogap phase that is not well-understood. What attempts have been made to understand the pseudogap phase?
2ndQuantized's user avatar
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10 votes
2 answers
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Methods for studying superconductivity?

From Wikipedia, superconductivity is the set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. Any ...
Camps's user avatar
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20 votes
1 answer
157 views

What class of materials are closest to realizing the tunable coupling Hamiltonian?

From a physics point of view, there is an effective (approximation to second-order coupling Jaynes-Cummings) Hamiltonian of the form [1] \begin{equation} H=\sum_j\omega_j(t)\sigma_j^z+\sum_{\langle i,...
Siddhant Singh's user avatar
17 votes
2 answers
135 views

Can ab initio crystal structure methods predict the structure of cuprates from their stoichiometry and quantify the brittleness of those materials?

Current ab initio methods may not be able to predict the electronic transport properties of cuprate superconductors but can they be used to predict their crystal structure? Furthermore those materials ...
pldd86's user avatar
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12 votes
1 answer
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What limits the accuracy of ab initio methods in predicting the transition temperature of conventional superconductors?

Here I assume that conventional superconductors refer to materials that undergo a superconducting transition at low temperature as described by the Bardeen-Cooper-Schrieffer theory (BCS). For those ...
pldd86's user avatar
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19 votes
1 answer
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Are there any High-Throughput studies that aim to discover High Tc superconductors?

High-Throughput materials modeling based on Density Functional Theory has become very popular recently. If, for example, we search "High-Throughput Perovskites" in Google Scholar, we get over ~14,000 ...
epalos's user avatar
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