Effect of covalent bonding on the superconducting critical temperature of the H-S-Se system

Liu, Binbin; Cui, Wenwen; Shi, Jingming; Zhu, Li; Ju, Chen; Lin, Shu‐Wha; Su, Ruiming; Ma, Jiayu; Yang, Kang; Xu, Meiling; Hao, Jian; Durajski, A. P.; Qi, Jingshan; Li, Yanling; Li, Yinwei

doi:10.1103/physrevb.98.174101

Cited by 71 publications

(67 citation statements)

References 67 publications

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“…A state of atoms with non-zero orbital angular momentum can be detected by measuring the density-density correlation function [71]. Parameter values of V 0 /( ω) = 3.5 and ωT = 500 could for example be experimentally realized using 133 Cs atoms with lasers of wavelength λ = 1064 nm and a lattice depth of 49E r for the unperturbed lattice, where E r = 2 k 2 2m is the recoil energy.…”

Section: Experimental Considerationsmentioning

confidence: 99%

Selective population of a large-angular-momentum state in an optical lattice

Kiely¹,

Muga²,

Ruschhaupt³

2018

Phys. Rev. A

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We propose a method to selectively populate a large angular momentum state of ultracold atoms (each with an orbital angular momentum l ≈ 2 ) in the Mott regime of a two-dimensional optical lattice. This is done by periodically modulating the lattice amplitude and implementing an additional rotated rectangular lattice of shorter wavelength. The specific pulse sequences are designed using a four-level model for each well and are implemented sequentially. The results are confirmed with numerical simulations of the full Schrödinger equation. These methods are another step in constructing a modular toolbox of operations for creating higher orbital states in optical lattices.

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Section: Experimental Considerationsmentioning

confidence: 99%

Selective population of a large-angular-momentum state in an optical lattice

Kiely¹,

Muga²,

Ruschhaupt³

2018

Phys. Rev. A

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“…The discovery of near-room-temperature (NRT) superconductivity in highly-compressed H 3 S (T c =203 K) [1], and the following discovery of superconductivity in LaH 10 (T c =250 K, P=150 GPa) [2] (current status of the research in the field can be found elsewhere [3][4][5][6][7]), is widely held [8] as a success of the predictions of Ashcroft [9] and Ginzburg [10]. These predictions were based on electron-phonon interactions of Bardeen, Cooper, and Schrieffer's (BCS) theory of superconductivity [11].…”

Section: Introductionmentioning

confidence: 99%

“…However, as we have shown previously [12,13] the available data for these superhydrides can be successfully interpreted in the phenomenology of unconventional (non-BCS) superconductivity-suggesting that the mechanism is not BCS electron-phonon coupling. To further our analysis, and hopefully reiterate the need for new experimental data on the H 3 S-D 3 S system, we revisit the thorium-based hydrides Th 4 H 15 -Th 4 D 15 , ThH 9 , and ThH 10 , to see if a similar conclusion has been overlooked.…”

Section: Introductionmentioning

confidence: 99%

Classifying superconductivity in ThH-ThD superhydrides/superdeuterides

Talantsev

Mataira

2020

Mater. Res. Express

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Satterthwaite and Toepke (1970 Phys. Rev. Lett. 25 741) discovered that Th 4 H 15 -Th 4 D 15 superhydrides are superconducting but exhibit no isotope effect. As the isotope effect is a fundamental prediction of electron-phonon mediated superconductivity described by Bardeen, Cooper, and Schrieffer (BCS) its absence alludes to some other mechanism. Soon after this work, Stritzker and Buckel (1972 Zeitschrift für Physik A Hadrons and nuclei 257 1-8) reported that superconductors in the PdH x -PdD x system exhibit the reverse isotope effect. Yussouff et al (1995 Solid State Communications 94 549) extended this finding in PdH x -PdD x -PdT x systems. Renewed interest in hydrogen-and deuterium-rich superconductors is driven by the discovery of near-room-temperature superconductivity in highlycompressed H 3 S (Drozdov et al 2015 Nature 525 73) and LaH 10 (Somayazulu et al 2019 Phys. Rev. Lett. 122 027001).Here we attempt to reaffirm or disprove our primary idea that the mechanism for nearroom-temperature superconductivity in hydrogen-rich superconductors is not BCS electron-phonon mediated. To that end, we analyse the upper critical field data, B c2 (T), in Th 4 H 15 -Th 4 D 15 (Satterthwaite and Toepke 1970 Phys. Rev. Lett. 25 741) as well as two recently discovered highpressure hydrogen-rich phases of ThH 9 and ThH 10 (Semenok et al 2019 Materials Today,

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“…On the other hand the anomalous transport properties of the rare earths are due to the direct exchange interaction between the conduction electrons and the 4f electrons (2). This exchange interaction can be expressed by the Heisenberg Hamiltonian , N ^ = N Z V. (r-R )(g-l)J •£ , (1.2) n^, a -n -n where N is the number of ions, is the exchange integral, is the posi tion vector of the conduction electron, ^ is the position of the ion, g is the Lande g-factor, is the total angular momentum of the n^^ ion, and CT is the spin angular momentum of the conduction electron.…”

mentioning

confidence: 99%

Thermal conductivity and Lorenz function of gadolinium, terbium, and holmium single crystals

Nellis

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Effect of covalent bonding on the superconducting critical temperature of the H-S-Se system

Cited by 71 publications

References 67 publications

Selective population of a large-angular-momentum state in an optical lattice

Selective population of a large-angular-momentum state in an optical lattice

Classifying superconductivity in ThH-ThD superhydrides/superdeuterides

Thermal conductivity and Lorenz function of gadolinium, terbium, and holmium single crystals

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