Investigation of the gap-to-Tc ratio of LaH10 and LaD10 superconductors

Ruangrungrote, Siriluk; Chanpoom, Thaipanya; Thaninworapak, R.; Udomsamuthirun, P.

doi:10.1142/s0217979223502302

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…The field of experimental and theoretical studies of materials with strongly correlated charge carriers [46][47][48][49]57,[59][60][61]74,[98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116], including diborides [44,[46][47][48][49]107,108], is experiencing a boom. In this work, we deduced the primary superconducting parameters of highly compressed diborides: the P6/mmm phases of MoB 2 and WB 2 and ambient pressure superconductors Nd 0.75 Mo 0.25 B 2 .…”

Section: Discussionmentioning

confidence: 99%

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

Talantsev

2023

Symmetry

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Recently, Pei et al. (National Science Review2023, nwad034, 10.1093/nsr/nwad034) reported that ambient pressure β-MoB2 (space group: R3¯m) exhibits a phase transition to α-MoB2 (space group: P6/mmm) at pressure P~70 GPa, which is a high-temperature superconductor exhibiting Tc=32 K at P~110 GPa. Although α-MoB2 has the same crystalline structure as ambient-pressure MgB2 and the superconducting critical temperatures of α-MoB2 and MgB2 are very close, the first-principles calculations show that in α-MoB2, the states near the Fermi level, εF, are dominated by the d-electrons of Mo atoms, while in MgB2, the p-orbitals of boron atomic sheets dominantly contribute to the states near the εF. Recently, Hire et al. (Phys. Rev. B2022, 106, 174515) reported that the P6/mmm-phase can be stabilized at ambient pressure in Nb1−xMoxB2 solid solutions, and that these ternary alloys exhibit Tc~8 K. Additionally, Pei et al. (Sci. China-Phys. Mech. Astron. 2022, 65, 287412) showed that compressed WB2 exhibited Tc~15 K at P~121 GPa. Here, we aimed to reveal primary differences/similarities in superconducting state in MgB2 and in its recently discovered diboride counterparts, Nb1−xMoxB2 and highly-compressed WB2. By analyzing experimental data reported for P6/mmm-phases of Nb1−xMoxB2 (x = 0.25; 1.0) and highly compressed WB2, we showed that these three phases exhibit d-wave superconductivity. We deduced 2Δm(0)kBTc=4.1±0.2 for α-MoB2, 2Δm(0)kBTc=5.3±0.1 for Nb0.75Mo0.25B2, and 2Δm(0)kBTc=4.9±0.2 for WB2. We also found that Nb0.75Mo0.25B2 exhibited high strength of nonadiabaticity, which was quantified by the ratio of TθTF=3.5, whereas MgB2, α-MoB2, and WB2 exhibited TθTF~0.3, which is similar to the TθTF in pnictides, A15 alloys, Heusler alloys, Laves phase compounds, cuprates, and highly compressed hydrides.

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Section: Discussionmentioning

confidence: 99%

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

Talantsev

2023

Symmetry

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“…Another possible consequence of exerting pressure on a hydride superconductor is the possible fluctuation of the density of states, resulting in the formation of a narrow peak in the density of states. This peak is seen to occur somewhat below the Fermi level [17,28,29]. In our suggested model, we also made the assumption that the fluctuation in carriers under pressure leads to a single narrow fluctuation constant in the density of states.…”

Section: Methodsmentioning

confidence: 97%

“…In the LaH 10 superconductor, the theoretical confirmation of an electron-phonon coupling mechanism with a larger gapto-T c ratio than the BCS value in the superconductors [14,15] T c = 214 K with R = 4.6 at 300 GPa was observed [14]. In yttrium hydride superconductors, there were reports of YH 4 , YH 6 , YH 7 and YH 9 with R = 4.1-4.3, 5.0, 3.7-3.9 [6,16,17] and 4.7-5.5 [7,17]. The critical temperature of yttrium hydride superconductors, referred to as YH 9 , was found to exhibit exceptional properties in experimental studies.…”

Section: Introductionmentioning

confidence: 94%

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

Tongkhonburi,

Udomsamuthirun,

Changjan

et al. 2024

Crystals

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This study investigates the gap-to-Tc ratio (R) of yttrium hydride superconductors within the weak coupling limit. We derived an analytical formula for the gap-to-Tc ratio. The ratio of the gap-to-Tc is dependent on the pressure applied to each superconductor. The maximum ratio, approximately 3.85, is observed in one superconductor, while the lowest ratio, roughly 3.21, is found in another superconductor. Based on the findings of our study, it can be deduced that yttrium hydride superconductors exhibit attributes commonly associated with weak-coupling superconductors. The influence of the Coulomb potential is more pronounced at a critical temperature compared to the ratio of the gap to the critical temperature.

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Investigation of the effect of high pressure on the superfluid density of H3S, LaH10, and CaAlSi superconductors

Chanilkul

Changjan²,

Udomsamuthirun

2023

Physica C: Superconductivity and its Applications

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Investigation of the gap-to-Tc ratio of LaH10 and LaD10 superconductors

Cited by 3 publications

References 34 publications

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors

Investigation of the effect of high pressure on the superfluid density of H3S, LaH10, and CaAlSi superconductors

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