Noncentrosymmetric superconductor BeAu

Amon, Alfred; Svanidze, Eteri; Cardoso‐Gil, Raúl; Wilson, M. N.; Rösner, H.; Bobnar, Matej; Schnelle, Walter; Lynn, J. W.; Gumeniuk, Roman; Hennig, Christoph; Luke, G. M.; Borrmann, Horst; Leithe‐Jasper, Andreas; Grin, Yu.

doi:10.1103/physrevb.97.014501

Cited by 38 publications

(72 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…27,28 However, a more comprehensive analysis of the superconducting state in Y 4 Be 33 Pt 16 is currently underway. In particular, because several in-depth muon spin-rotation, relaxation, and resonance experiments performed on another Be-containing non-centrosymmetric superconductor BeAu 24 revealed that not only type-I character, 29 but also a multi-gap nature of superconductivity 30 may exist in such unconventional systems.…”

Section: Resultsmentioning

confidence: 99%

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

et al. 2020

View full text Add to dashboard Cite

show abstract

“…After melting, the boule was annealed in an argon atmosphere for 48 hours at 400 • C. Further details can be found in Ref. [30].…”

Section: Experimental Methodsmentioning

confidence: 99%

μSR and magnetometry study of the type-I superconductor BeAu

et al. 2019

Self Cite

View full text Add to dashboard Cite

We present muon spin rotation and relaxation (µSR) measurements as well as demagnetising field corrected magnetisation measurements on polycrystalline samples of the noncentrosymmetric superconductor BeAu. From µSR measurements in a transverse field, we determine that BeAu is a type-I superconductor with Hc = 256 Oe, amending the previous understanding of the compound as a type-II superconductor. To account for demagnetising effects in magnetisation measurements, we produce an ellipsoidal sample, for which a demagnetisation factor can be calculated. After correcting for demagnetising effects, our magnetisation results are in agreement with our µSR measurements. Using both types of measurements we construct a phase diagram from T = 30 mK to Tc ≈ 3.25 K. We then study the effect of hydrostatic pressure and find that 450 MPa decreases Tc by 34 mK, comparable to the change seen in type-I elemental superconductors Sn, In and Ta, suggesting BeAu is far from a quantum critical point accessible by the application of pressure. arXiv:1902.00073v1 [cond-mat.supr-con]

show abstract

“…The data of Cu 0.09 Bi 2 Se 3 were extracted from our magnetization measurement, and other data points of Cu x Bi 2 Se 3 were obtained from magnetization and μSR measurements in previous reports [53,55]. [143], Nb 0.5 Os 0.5 [114], Re 6 Zr [144], Mo 3 P [113], and BeAu [145], thin films of transition-metal nitrides NbN [14,91], heavy fermions superconductors UPt 2 , UBe 13 and Ce 1−x Yb x CoIn 5 [146][147][148], and conventional metal superconductors [82,119].…”

Section: Discussionmentioning

confidence: 99%

Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport

Fang

You

2020

New J. Phys.

View full text Add to dashboard Cite

Although the Cu doped Bi 2 Se 3 topological insulator was discovered and intensively studied for almost a decade, its electrical and magnetic properties in normal state, and the mechanism of 'high-T c ' superconductivity regarding the relatively low-carrier density are still not addressed yet. In this work, we report a systematic investigation of magnetic susceptibility, critical fields, and electrical transport on the nominal Cu 0.20 Bi 2 Se 3 single crystals with T onset c = 4.18 K, the highest so far. The composition analysis yields the Cu stoichiometry of x = 0.09(1). The magnetic susceptibility shows considerable anisotropy and an obvious kink at around 96 K was observed in the magnetic susceptibility for H c, which indicates a charge density anomaly. The electrical transport measurements indicate the two-dimensional (2D) Fermi liquid behavior at low temperatures with a high Kadowaki-Woods ratio, A/γ 2 = 30.3a 0 . The lower critical field at 0 K limit was extracted to be 6.0 Oe for H ab. In the clean limit, the ratio of energy gap to T c was determined to be Δ 0 /k B T c = 2.029 ± 0.124 exceeding the standard BCS value 1.764, suggesting Cu 0.09 Bi 2 Se 3 is a strong-coupling superconductor. The in-plane penetration depth at 0 K was calculated to be 1541.57 nm, resulting in an unprecedented high ratio of T c /λ −2 (0) ∼ = 9.86. Moreover, the ratio of T c to Fermi temperature is estimated to be T c /T 2D F = 0.034. Both ratios fall into the region of unconventional superconductivity according to Uemura's regime, supporting the unconventional superconducting mechanism in Cu x Bi 2 Se 3 . Finally, the enhanced T c value higher than 4 K is proposed to arise from the increased density of states at Fermi energy and strong electron-phonon interaction induced by the charge density instability. 1 K, such as SrTiO 3 (T c ∼ 0.05-0.29 K, n e = 0.65 to 42.4 × 10 20 cm −3 ) [3,4], GeTe (T c ∼ 0.07-0.3 K, n e = 8.6 to 15.2 × 10 20 cm −3 ) [5], and SnTe (T c ∼ 0.034-0.214 K, n p = 7.5 to 20.0 × 10 20 cm −3 ) [6]. To compare with these systems, the T c value of Cu x Bi 2 Se 3 is relatively 'high' given it is a highly doped narrow semiconductor with lower carrier density. However, the mechanism of such anomalous enhanced T c phenomenon remains unclear despite nearly a decade of extensive research. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft New J. Phys. 22 (2020) 053026 Y Fang et alThe emergence and enhancement of superconductivity may occur in various cases by tailoring the ground states of quantum materials. For example, suppression of charge density wave (CDW) by chemical doping or pressure is observed in many systems [7-10], including low dimensional layered Cu x TiSe 2 and three dimensional (3D) alloys Lu(Pt 1−x Pd x ) 2 In and (Sr, Ca) 3 Ir 4 Sn 13 , 3D oxides Ba 1−x K x BiO 3 . Similarly, the magnetic ordering or spin density wave (SDW) have also been suppressed in strongly correlated heavy fermions materials, high-T c cuprates and i...

show abstract

Noncentrosymmetric superconductor BeAu

Cited by 38 publications

References 68 publications

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

μSR and magnetometry study of the type-I superconductor BeAu

Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport

Contact Info

Product

Resources

About

Noncentrosymmetric superconductor BeAu

Cited by 38 publications

References 68 publications

Y4Be33Pt16 – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

Y4Be33Pt16 – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

μSR and magnetometry study of the type-I superconductor BeAu

Unconventional superconductivity in CuxBi2Se3 from magnetic susceptibility and electrical transport

Contact Info

Product

Resources

About

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

Y₄Be₃₃Pt₁₆ – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport