High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility

ABSTRACT The search for high-temperature superconductivity is one of the research frontiers in physics. In the sulfur hydride system, an extremely high Tc (∼200 K) has been recently developed at pressure. However, the Meissner effect measurement above megabar pressures is still a great challenge. Here, we report the superconductivity identification of sulfur hydride at pressure, employing an in situ alternating-current magnetic susceptibility technique. We determine the superconducting phase diagram, finding that superconductivity suddenly appears at 117 GPa and Tc reaches 183 K at 149 GPa before decreasing monotonically with increasing pressure. By means of theoretical calculations, we elucidate the variation of Tc in the low-pressure region in terms of the changing stoichiometry of sulfur hydride and the further decrease in Tc owing to a drop in the electron–phonon interaction parameter λ. This work provides a new insight into clarifying superconducting phenomena and anchoring the superconducting phase diagram in the hydrides.

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MAGNETIC PROPERTIES OF PSEUDO-BINARY Mn1−xFexSn2 ALLOYS

International Journal of Modern Physics B ◽

10.1142/s0217979293001852 ◽

1993 ◽

Vol 07 (01n03) ◽

pp. 867-870 ◽

Cited By ~ 3

Author(s):

H. SHIRAISHI ◽

T. HORI ◽

Y. YAMAGUCHI ◽

S. FUNAHASHI ◽

K. KANEMATSU

Keyword(s):

Field Theory ◽

Phase Diagram ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

High Temperature ◽

Magnetic Structure ◽

Magnetic Phase ◽

Magnetic Phase Diagram ◽

Molecular Field ◽

Magnetic Phases

The magnetic susceptibility measurements have been made on antiferromagnetic compounds Mn1–xFexSn2 and the magnetic phase diagram was illustrated. The high temperature magnetic phases I and III, major phases, were analyzed on the basis of molecular field theory and explained the change of magnetic structure I⇌III occured at x≈0.8.

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The R dependence of the phase diagram of Bi2Sr2−xRxCuOy and its implication on high temperature superconductivity

Physica C Superconductivity ◽

10.1016/j.physc.2007.03.113 ◽

2007 ◽

Vol 460-462 ◽

pp. 440-441 ◽

Cited By ~ 1

Author(s):

Y. Okada ◽

T. Takeuchi ◽

T. Baba ◽

S. Shin ◽

H. Ikuta

Keyword(s):

Phase Diagram ◽

High Temperature ◽

High Temperature Superconductivity

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Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films

Nature Materials ◽

10.1038/nmat3648 ◽

2013 ◽

Vol 12 (7) ◽

pp. 605-610 ◽

Cited By ~ 516

Author(s):

Shaolong He ◽

Junfeng He ◽

Wenhao Zhang ◽

Lin Zhao ◽

Defa Liu ◽

...

Keyword(s):

Phase Diagram ◽

High Temperature ◽

High Temperature Superconductivity ◽

Single Layer

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Phase diagram of cuprate high-temperature superconductors based on the optimization Monte Carlo method

Modern Physics Letters B ◽

10.1142/s0217984920400461 ◽

2020 ◽

Vol 34 (19n20) ◽

pp. 2040046

Author(s):

T. Yanagisawa ◽

M. Miyazaki ◽

K. Yamaji

Keyword(s):

Phase Diagram ◽

Monte Carlo ◽

Wave Function ◽

High Temperature ◽

Hubbard Model ◽

Ground State ◽

State Energy ◽

High Temperature Superconductivity ◽

Two Dimensional ◽

Text Model

It is important to understand the phase diagram of electronic states in the CuO2 plane to clarify the mechanism of high-temperature superconductivity. We investigate the ground state of electronic models with strong correlation by employing the optimization variational Monte Carlo method. We consider the two-dimensional Hubbard model as well as the three-band [Formula: see text]–[Formula: see text] model. We use the improved wave function that takes account of inter-site electron correlation to go beyond the Gutzwiller wave function. The ground state energy is lowered considerably, which now gives the best estimate of the ground state energy for the two-dimensional Hubbard model. The many-body effect plays an important role as an origin of spin correlation and superconductivity in correlated electron systems. We investigate the competition between the antiferromagnetic state and superconducting state by varying the Coulomb repulsion [Formula: see text], the band parameter [Formula: see text] and the electron density [Formula: see text] for the Hubbard model. We show phase diagrams that include superconducting and antiferromagnetic phases. We expect that high-temperature superconductivity occurs near the boundary between antiferromagnetic phase and superconducting one. Since the three-band [Formula: see text]–[Formula: see text] model contains many-band parameters, high-temperature superconductivity may be more likely to occur in the [Formula: see text]–[Formula: see text] model than in single-band models.

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High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS

Novel Superconducting Materials ◽

10.1515/nsm-2016-0004 ◽

2016 ◽

Vol 2 (1) ◽

Cited By ~ 5

Author(s):

Annette Bussmann-Holder ◽

Jürgen Köhler ◽

M.-H. Whangbo ◽

Antonio Bianconi ◽

Arndt Simon

Keyword(s):

High Pressure ◽

High Temperature ◽

Transition Temperature ◽

Hydrogen Bonds ◽

Pressure Dependence ◽

High Temperature Superconductivity ◽

Superconducting Phase ◽

Ultrahigh Pressure ◽

Phonon Modes ◽

Interband Coupling

AbstractThe recent report of superconductivity under high pressure at the record transition temperature of Tc =203 K in pressurized H2S has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is demonstrated that conventional theories of superconductivity in the sense of BCS or Eliashberg formalisms cannot account for the pressure dependence of the isotope coefficient. The only way out of the dilemma is a multi-band approach of superconductivity where already small interband coupling suffices to achieve the high values of Tc together with the anomalous pressure dependent isotope coefficient. In addition, it is shown that anharmonicity of the hydrogen bonds vanishes under pressure whereas anharmonic phonon modes related to sulfur are still active.

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High Temperature Superconductivity Due to a Long-Range Electron–Phonon Interaction, Application to Isotope Effects, Thermomagnetic Transport and Nanoscale Heterogeneity in Cuprates

Journal of Superconductivity ◽

10.1007/s10948-005-0046-6 ◽

2005 ◽

Vol 18 (5-6) ◽

pp. 603-612 ◽

Cited By ~ 8

Author(s):

A. S. Alexandrov

Keyword(s):

High Temperature ◽

Long Range ◽

High Temperature Superconductivity ◽

Isotope Effects ◽

Phonon Interaction ◽

Electron Phonon Interaction ◽

Thermomagnetic Transport

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Theoretical Studies of Copper Oxide Clusters: Prediction of an Electronically Driven Phase Separation in YBa2Cu3Ox

MRS Proceedings ◽

10.1557/proc-99-95 ◽

1987 ◽

Vol 99 ◽

Cited By ~ 1

Author(s):

L. A. Curtiss ◽

T. O. Brun ◽

D. M. Gruen

Keyword(s):

Phase Diagram ◽

Phase Separation ◽

High Temperature ◽

Copper Oxide ◽

Superconducting Phase ◽

Oxygen Stoichiometry ◽

Molecular Orbital Calculations ◽

Theoretical Studies ◽

Two Phases ◽

Semi Empirical

ABSTRACTOn the basis of semi-empirical extended Hiickel molecular orbital calculations of copper-oxide clusters representing the new superconducting material YBa2Cu3Ox, a phase diagram is proposed which suggests that the 94 K high temperature superconducting phase of YBa2Cu3Ox is characterized by an oxygen stoichiometry near 7.0. The phase diagram predicts that a plateau should exist for Tc in the region x = 0.0 – 0.25 and that in this region two phases are present which are characterized by compositions having oxygen stoichiometries 6.5–6.75 and ca. 7.0.

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