The sensitive tunability of superconducting critical temperature in high-buckled plumbene by shifting Fermi level

AbstractBy analyzing structural and electronic properties of more than a hundred predicted hydrogen-based superconductors, we determine that the capacity of creating an electronic bonding network between localized units is key to enhance the critical temperature in hydrogen-based superconductors. We define a magnitude named as the networking value, which correlates with the predicted critical temperature better than any other descriptor analyzed thus far. By classifying the studied compounds according to their bonding nature, we observe that such correlation is bonding-type independent, showing a broad scope and generality. Furthermore, combining the networking value with the hydrogen fraction in the system and the hydrogen contribution to the density of states at the Fermi level, we can predict the critical temperature of hydrogen-based compounds with an accuracy of about 60 K. Such correlation is useful to screen new superconducting compounds and offers a deeper understating of the chemical and physical properties of hydrogen-based superconductors, while setting clear paths for chemically engineering their critical temperatures.

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Tuning of the Fermi level at the second subband of a superlattice of quantum wires in the CuO2 plane: A possible mechanism to raise the critical temperature

Journal of Superconductivity ◽

10.1007/bf00727276 ◽

1996 ◽

Vol 9 (4) ◽

pp. 343-348 ◽

Cited By ~ 3

Author(s):

N. L. Saini ◽

T. Rossetti ◽

A. Lanzara ◽

M. Missori ◽

A. Perali ◽

...

Keyword(s):

Critical Temperature ◽

Fermi Level ◽

Quantum Wires ◽

Cuo2 Plane

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SUPERSTRIPES

International Journal of Modern Physics B ◽

10.1142/s0217979200003769 ◽

2000 ◽

Vol 14 (29n31) ◽

pp. 3289-3297 ◽

Cited By ~ 71

Author(s):

A. BIANCONI

Keyword(s):

Critical Temperature ◽

Fermi Level ◽

Critical Point ◽

Room Temperature ◽

Quantum Critical Point ◽

Single Electrons ◽

Self Organized ◽

Atomic Limit ◽

De Broglie Wavelength ◽

Short Time

A superconducting superlattice of quantum stripes with a particular shape that gives the amplification of the critical temperature is called "superstripes". This superlattice is characterized by: a) the metallic stripe width L of the order of the de Broglie wavelength of electrons at the Fermi level, L ~λ F , and b) the hopping of pairs between the stripes larger than the hopping of single electrons. "Superstripes" can be realized artificially to get new room temperature superconductors (RTS). This particular mesoscopic heterostructure at the atomic limit has been found as a self organized network of charges, in a short time and space scale, in doped cuprate perovskites near the micro-strain quantum critical point for "superstripes" formation.

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MAGNETISM, PHONONS AND ANISOTROPY OF HIGH TEMPERATURE CUPRATES SUPERCONDUCTORS

International Journal of Modern Physics B ◽

10.1142/s0217979201004678 ◽

2001 ◽

Vol 15 (05) ◽

pp. 511-526 ◽

Cited By ~ 10

Author(s):

JACQUES FRIEDEL ◽

MAHITO KOHMOTO

Keyword(s):

High Temperature ◽

Critical Temperature ◽

Fermi Level ◽

Density Of States ◽

Hole Doping ◽

Magnetic Fluctuations ◽

Phonon Coupling ◽

High Critical Temperature ◽

Bloch Functions ◽

Gap Anisotropy

Phonon or electron mediated weak BCS attraction is enough to have high critical temperature if a van Hove anomaly is at work. This could apply to electron doped compounds and also to compounds with CuO 2 planes overdoped in holes, where T c decreases with increasing doping. If phonons dominate, it should lead to an anisotropic but mainly s superconductive gap, as observed recently in overdoped LaSrCuO, and probably also in electron doped compounds. If electrons dominate, a d-gap should develop as observed in a number of cases. In the underdoped range, the observed decrease of T c with hole doping can be related in all cases to the development of antiferromagnetic fluctuations which produces a magnetic pseudogap, thus lowering the density of states at the Fermi level. The observed mainly d-superconductive gap then can be due to a prevalent superconductive coupling through antiferromagnetic fluctuations; it could also possibly be attributed to the same phonon coupling as in the overdoped range, now acting on Bloch functions scattered in the magnetic pseudogap. More systematic studies of superconductive gap anisotropy and of magnetic fluctuations would be in order.

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MAGNETIC PROPERTIES OF Ti-Co SOLID SOLUTIONS

Modern Physics Letters B ◽

10.1142/s0217984999000312 ◽

1999 ◽

Vol 13 (08) ◽

pp. 233-238

Author(s):

IULIU POP ◽

OLIVIA POP

Keyword(s):

Phase Diagram ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

Critical Temperature ◽

Fermi Level ◽

Solid Solutions ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

Main Mechanism ◽

Thermal Variation

Thermal variation of the magnetic susceptibility for Ti-Co solid solutions is reported. Cobalt, by alloying acts on the transition Néel temperature giving rise to a complicated magnetic phase diagram. The change of the Fermi level is the main mechanism in the critical temperature, T N , shift.

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SPONTANEOUS CURRENTS IN MESOSCOPIC RINGS

Modern Physics Letters B ◽

10.1142/s0217984992001198 ◽

1992 ◽

Vol 06 (24) ◽

pp. 1481-1499 ◽

Cited By ~ 11

Author(s):

D. WOHLLEBEN ◽

P. FRECHE ◽

M. ESSER ◽

E. ZIPPER ◽

M. SZOPA

Keyword(s):

Phase Transition ◽

Critical Temperature ◽

Elastic Scattering ◽

Fermi Surface ◽

Fermi Level ◽

Magnetic Interaction ◽

Quantum Size ◽

A Current

In a system of mesoscopic rings the influence of orbital magnetic interaction between the electrons is investigated. At a critical temperature Tc the system undergoes a phase transition into a current carrying state. Tc depends strongly on geometry of the system and/or its Fermi-surface, and on the quantum size gap at the Fermi level. Elastic scattering reduces Tc and eventually suppresses the transition.

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