Microscopic mechanism of room-temperature superconductivity in compressed 
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Liu, Liangliang; Wang, Chongze; Yi, Seho; Kim, Kun Woo; Kim, Jae-Yong; Cho, Jun-Hyung

doi:10.1103/physrevb.99.140501

Cited by 82 publications

(68 citation statements)

References 40 publications

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“…These compounds are in many ways all realizations of the Aschcroft-Ginzburg-Gilman's arguments, but with very different outcomes. In fact, the actual superconducting properties Figure 28:Éliashberg α 2 F function computed for selected hydrides: PdH (0 GPa) [208], PH 2 (120 GPa) [168], H 3 S (200 GPa) [173], LaH 10 (300 GPa) [461] and H 2 (500 GPa) [464]. A vertical shift is applied for plotting the functions.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

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

et al. 2020

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“…Flagrantly, the breakdown of the classical harmonic approximation for phonons makes impossible the estimation of T c below ∼250 GPa in the F m-3m phase and questions all previous calculations [19,29]. Indeed, the anharmonic phonon renormalization remains huge also at 264 GPa (see Figure 2).…”

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confidence: 89%

Quantum crystal structure in the 250-kelvin superconducting lanthanum hydride

Errea

Belli

Monacelli

et al. 2020

Nature

274

216

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The discovery of superconductivity at 200 K in the hydrogen sulfide system at large pressures [1] was a clear demonstration that hydrogen-rich materials can be high-temperature superconductors. The recent synthesis of LaH10 with a superconducting critical temperature (Tc) of 250 K [2, 3] places these materials at the verge of reaching the long-dreamed room-temperature superconductivity.Electrical and x-ray diffraction measurements determined a weakly pressure-dependent Tc for LaH10 between 137 and 218 gigapascals in a structure with a face-centered cubic (fcc) arrangement of La atoms [3]. Here we show that quantum atomic fluctuations stabilize in all this pressure range a high-symmetry F m-3m crystal structure consistent with experiments, which has a colossal electronphonon coupling of λ ∼ 3.5. Even if ab initio classical calculations neglecting quantum atomic vibrations predict this structure to distort below 230 GPa yielding a complex energy landscape with many local minima, the inclusion of quantum effects simplifies the energy landscape evidencing the F m-3m as the true ground state. The agreement between the calculated and experimental Tc values further supports this phase as responsible for the 250 K superconductivity. The relevance of quantum fluctuations in the energy landscape found here questions many of the crystal structure predictions made for hydrides within a classical approach that at the moment guide the experimental quest for room-temperature superconductivity [4][5][6]. Furthermore, quantum effects reveal crucial to sustain solids with extraordinary electron-phonon coupling that may otherwise be unstable [7]. arXiv:1907.11916v1 [cond-mat.supr-con]

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“…Their structure is quite different from the one of H3S where each hydrogen atom is strongly, covalently connected to the two nearby sulfur atoms. The clathrate structure with even larger hydrogen content, H32 cages, were later predicted in YH10 and in rare earth (RE) hydrides 3 such as LaH10 3,4,21 . These superhydrides can be considered to be doped versions of metallic hydrogen and therefore are naturally expected to have high Tcs.…”

mentioning

confidence: 92%

Superconductivity at 250 K in lanthanum hydride under high pressures

Дроздов

Kong

Minkov

et al. 2019

Nature

1,310

1,079

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The discovery of superconductivity at 203 K in H3S 1 brought attention back to conventional superconductors whose properties can be described by the Bardeen-Cooper-Schrieffer (BCS) and the Migdal-Eliashberg theories. These theories predict that high, and even room temperature superconductivity (RTSC) is possible in metals possessing certain favorable parameters such as lattice vibrations at high frequencies. However, these general theories do not suffice to predict real superconductors. New superconducting materials can be predicted now with the aid of first principles calculations based on Density Functional Theory (DFT). In particular, the calculations suggested a new family of hydrides possessing a clathrate structure, where the host atom (Ca, Y, La) is at the center of the cage formed by hydrogen atoms 2-4 . For LaH10 and YH10 superconductivity, with critical temperatures Tc ranging between 240 and 320 K is predicted at megabar pressures 3-6 . Here, we report superconductivity with a record Tc  250 K within the Fm3m structure of LaH10 at a pressure P  170 GPa. We proved the existence of superconductivity at 250 K through the observation of zero-resistance, isotope effect, and the decrease of Tc under an external magnetic field, which suggests an upper critical magnetic field of 120 T at zerotemperature. The pressure dependence of the transition temperatures Tc (P) has a maximum of 250-252 K at the pressure of about 170 GPa. This leap, by  50 K, from the previous Tc record of 203 K 1 indicates the real possibility of achieving RTSC (that is at 273 K) in the near future at high pressures and the perspective of conventional superconductivity at ambient pressure.

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Microscopic mechanism of room-temperature superconductivity in compressed LaH10

Cited by 82 publications

References 40 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

Quantum crystal structure in the 250-kelvin superconducting lanthanum hydride

Superconductivity at 250 K in lanthanum hydride under high pressures

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