Isotope effects and pressure dependence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>of superconducting stoichiometric PdH and PdD synthesized and measured in a diamond anvil cell

Hemmes, Herman K.; Driessen, A.; Griessen, R.; Gupta, Michèle

doi:10.1103/physrevb.39.4110

Cited by 46 publications

(29 citation statements)

References 31 publications

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“…The following works refer to studies of binary hydrides under pressure for which some of the information was taken Fig. 21: Li [542], K [543], Fr [434], Be [544], Mg [545], Ca [176], Sr [546,547] Ba [548], Ra [434], Sc [549], Y [182], La [182,177], (Ce, Pr, Nd, Ho, Er, Tm, and Lu) [434], Ac [550], Th [551], Pa [434,552], U [553], (Np, Cm) [434], (Ti,Zr,Hf) [434], V [554], Nb [555,556], Ta [557], Cr [558], W [559], Tc [560], Ru [561], Os [562], (Rh,Ir) [563], Pd [440,564], Pt [565,566,563,567], Au [563], B [568], Al [569], Ga [570], In [571], Si [159,572], Ge [573,574,…”

Section: Appendixmentioning

confidence: 99%

A perspective on conventional high-temperature superconductors at high pressure: Methods and materials

et al. 2020

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Two hydrogen-rich materials: H 3 S and LaH 10 , synthesized at megabar pressures have revolutionized the field of superconductivity by providing a first glimpse into the solution for the hundred-year-old problem of room-temperature superconductivity. The mechanism governing these exceptional superconductors is the conventional electron-phonon coupling. Here, we describe recent advances in experimental techniques, superconductivity theory and first-principles computational methods, which made this discovery possible. The aim of this work is to provide an up-to-date compendium of the available results on superconducting hydrides and explain the synergy of different methodologies that led to the extraordinary discoveries in the field. Furthermore, in an attempt to evidence empirical rules governing superconductivity in binary hydrides under pressure, we discuss general trends in electronic structure and chemical bonding. The last part of the Review introduces possible strategies to optimize pressure and transition temperatures in conventional superconducting materials. Directions for future research in areas of theory, computational methods and high-pressure experiments are proposed, in order to advance our understanding of superconductivity.

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Section: Appendixmentioning

confidence: 99%

A perspective on conventional high-temperature superconductors at high pressure: Methods and materials

et al. 2020

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“…No hydride phases are known for the noble metals silver, gold [11], osmium, and iridium. Interstitial hydrogen alloys are interesting due to their potentially important physical properties, such as modified crystalline structures and mechanical properties [12], altered microstructure [8] (nanocrystallinity), hydrogen mediated superconductivity [13,14], or potential hydrogen storage capabilities [10,15,16]. Furthermore, according to theoretical predictions, hydrogen confined in a host matrix might undergo the elusive transition to a metallic ground state at considerably lower pressures than pure hydrogen [17], which is expected to metallize above 375 GPa [18]pressures still out of reach of current static compression techniques.…”

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confidence: 99%

High-Pressure Synthesis and Characterization of Iridium Trihydride

Scheler

Marqués

Konôpková³

et al. 2013

Phys. Rev. Lett.

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We have performed in situ synchrotron x-ray diffraction studies of the iridium-hydrogen system up to 125 GPa. At 55 GPa, a phase transition in the metal lattice from the fcc to a distorted simple cubic phase is observed. The new phase is characterized by a drastically increased volume per metal atom, indicating the formation of a metal hydride, and substantially decreased bulk modulus of 190 GPa (383 GPa for pure Ir). Ab initio calculations show that the hydrogen atoms occupy the face-centered positions in the metal matrix, making this the first known noninterstitial noble metal hydride and, with a stoichiometry of IrH 3 , the one with the highest volumetric hydrogen content. Computations also reveal that several energetically competing phases exist, which can all be seen as having distorted simple cubic lattices. Slow kinetics during decomposition at pressures as low as 6 GPa suggest that this material is metastable at ambient pressure and low temperatures.

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“…In MgB 2 [3] and the fullerides [4], for example, the isotope coefficient is substantially reduced from the BCS value. In PdH, the compound interest in this work, the isotope coefficient is large and negative [5]; under pressure it diminishes steadily [6]. This is in contrast to H 3 S between 140 GPa and 180 GPa the isotope coefficient goes down very quickly and then it goes further down but more slowly [7,8].…”

Section: Introductionmentioning

confidence: 99%

On the calculation of the inverse isotope effect in PdH(D): A Migdal-Eliashberg theory approach

Villa-Cortés

Baquero

2018

Journal of Physics and Chemistry of Solids

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Replacement of hydrogen by deuterium in palladium hydride results in higher superconducting temperatures and an anomalous isotope effect that has not been yet fully explained. In this work, we try a new approach to the explanation of the inverse isotope effect in PdH(D). Our approach introduces two new aspects. First, we took into account the experimental evidence that at temperatures below 50 K, the crystal structure of PdH and of PdD is zincblende. Second, we take into account not only the influence of the electron-phonon interaction but also the electron-electron interaction contribution to the isotope coeffiecient due tothe replacement of deuterium in the place of hydrogen. We used the Migdal-Eliashberg theory to perform our ab initio calculations. We found in this picture that the electron-electron interaction is considerably reduced by the isotope substitution and is the most important factor to explain the inverse isotope effect. We found ∆T total c = 2.224 K and α = −0.3134 in excellent agreement with the values found experimentally.On the Calculation of the Inverse Isotope Effect in PdH(D)

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Isotope effects and pressure dependence of theTcof superconducting stoichiometric PdH and PdD synthesized and measured in a diamond anvil cell

Cited by 46 publications

References 31 publications

A perspective on conventional high-temperature superconductors at high pressure: Methods and materials

A perspective on conventional high-temperature superconductors at high pressure: Methods and materials

High-Pressure Synthesis and Characterization of Iridium Trihydride

On the calculation of the inverse isotope effect in PdH(D): A Migdal-Eliashberg theory approach

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