Single-gap superconductivity in Mo8Ga41

Marcin, Miroslav; Kačmarčı́k, J.; Kopčík, M.; Szabó, P.; Šofranko, Ondrej; Samuely, T.; Vaňo, Viliam; Marcenat, C.; Verchenko, Valeriy Yu.; Shevelkov, Аndrei V.; Samuely, P.

doi:10.1038/s41598-019-49846-y

Cited by 12 publications

(9 citation statements)

References 25 publications

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“…Here we present a supplementary study of this superconductor using local Hall probe magnetometry performed on the same piece of crystal as in our previous report [9]. We show that also the lower critical magnetic field might be affected by surface inhomogeneities of the sample and mimic the two-gap behavior.…”

Section: Introductionmentioning

confidence: 53%

“…This report clarified that Mo 8 Ga 41 is inherently a single-gap superconductor and supposed two-gap features are just a reflection of domains or slight inhomogeneities present along the dominant phase even in the seemingly perfect sample. It is a consequence of the existence of the phases which are structurally very close to Mo 8 Ga 41 [9].…”

Section: Introductionmentioning

confidence: 99%

“…This was followed by a report of Sirohi et al [8] who fitted the spectra obtained by the scanning tunneling spectroscopy on Mo 8 Ga 41 by two gaps varying their size at different places on the sample surface. Our recent publication [9] brought a detailed study of the thermodynamic properties of this material using high-sensitivity accalorimetry as well as spectroscopic properties by applying scanning tunneling spectroscopy/microscopy (STS/STM) on large areas of the sample surface. This report clarified that Mo 8 Ga 41 is inherently a single-gap superconductor and supposed two-gap features are just a reflection of domains or slight inhomogeneities present along the dominant phase even in the seemingly perfect sample.…”

Section: Introductionmentioning

confidence: 99%

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One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study

Marcin¹,

Kačmarč́ık²,

Medvecka³

et al. 2021

Supercond. Sci. Technol.

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The magnetization properties of the endohedral cluster superconductor Mo8Ga41 are studied by sensitive Hall-probe magnetometry. The temperature dependence of the lower critical magnetic field H c1 is obtained and compared to theoretical models accounting for single-gap and two-gap superconductivity. Data can be described by both models with minor differences. These results are confronted with our previous measurements which evidence that the system is inherently single-gap s-wave superconductor but minor additional phases are present also in seemingly perfect samples. We discuss how presence of such additional phases with varying size of the penetration depth and H c1 field is reflected in magnetization measurements which could lead to misinterpretation of the multigap superconductivity in Mo8Ga41.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study

Marcin¹,

Kačmarč́ık²,

Medvecka³

et al. 2021

Supercond. Sci. Technol.

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“…Its superconducting T c = 9.7 K and upper critical field µ 0 H c2 = 8.36 T. 7 It has been pointed out that, like MgB 2 , Mo 8 Ga 41 is also on the verge of a structural instability, 8,9 exhibits strong-coupling two-gap BCS superconductivity and good flux pinning potential. [10][11][12][13][14][15] In light of the relatively high critical temperature and upper critical field, further studies of this material are highly desirable.…”

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confidence: 99%

Three-dimensional Fermi surface and small effective masses in Mo8Ga41

Graf

Liu

et al. 2020

Applied Physics Letters

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We report Fermi surface characteristics of Mo 8 Ga 41 , a two-gap superconductor with critical temperature T c ∼10 K, obtained from quantum oscillation measurements. Four major frequencies have been observed with relatively small quastiparticle masses. Angular dependence of major frequencies indicates three-dimensional Fermi surface sheets. This argues for a relatively isotropic superconducting state and, given its relatively high T c , shows that a search for materials in this class could be of interest for superconducting wire applications.

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“…The existence of the low-lying phonon modes will also enhance the electron-phonon coupling. Mo 8 Ga 41 is a strong electronphonon coupling superconductor with T c of 9.8 K [19][20][21][22][23], as benchmarked by the normalized specific heat jump ∆c p /γT c and the gap-to-T c ratio 2∆/k B T c of 2.83 and 4.40, respectively [19,22], both larger than the BCS weak-coupling values [24,25]. Here, γ is the Sommerfeld coefficient.…”

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confidence: 99%

Linear magnetoresistance with a universal energy scale in a strong-coupling superconductor

Zhang,

Hu,

Kuo

et al. 2020

Preprint

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The recent discovery of a nonsaturating linear magnetoresistance in several correlated electron systems near a quantum critical point has revealed an interesting interplay between the linear magnetoresistance and the zero-field linear-in-temperature resistivity. These studies suggest a possible role of quantum criticality on the observed linear magnetoresistance. Here, we report our discovery of a nonsaturating, linear magnetoresistance in Mo8Ga41, a nearly isotropic strong electron-phonon coupling superconductor with a linear-in-temperature resistivity from the transition temperature to ∼55 K. The growth of the resistivity in field is comparable to that in temperature, provided that both quantities are measured in the energy unit. Our datasets are remarkably similar to magnetoresistance data of the optimally doped La2−xSrxCuO4, despite the clearly different crystal and electronic structures, and the apparent absence of quantum critical physics in Mo8Ga41. A new empirical scaling formula is developed, which is able to capture the key features of the low-temperature magnetoresistance data of Mo8Ga41, as well as the data of La2−xSrxCuO4.Recently, interesting cases of nonsaturating linear magnetoresistance (LMR) has been reported in several correlated electron systems, including CrAs under pressure, Ba(Fe 1/3 Co 1/3 Ni 1/3 ) 2 As 2 , La 2−x Ce x CuO 4 , La 2−x Sr x CuO 4 , BaFe 2 (As 1−x P x ) 2 and FeSe 1−x S x (with appropriate x for the latter four) [1][2][3][4][5][6]. In these systems, all related to families of topical superconductors, an intriguing interplay between the thermal and field energy scales have been established. A field-to-temperature scaling which involves a quadrature sum of the thermal and field energy scales, developed by Hayes et al. [5] has been successfully applied to CrAs, BaFe 2 (As 1−x P x ) 2 , FeSe 1−x S x and Ba(Fe 1/3 Co 1/3 Ni 1/3 ) 2 As 2 [1,2,5,6]. However, in the hole-doped cuprate La 2−x Sr x CuO 4 , the resistivity data do not follow the quadrature scaling [4,7], while in the electron-doped cuprate La 2−x Ce x CuO 4 (x=0.175), the resistivity data have been found to be proportional to the direct sum of thermal and field energies [3]. To further understand the interplay between the magnetic field and the temperature, more examples of correlated electron systems showing LMR are needed.

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Single-gap superconductivity in Mo8Ga41

Cited by 12 publications

References 25 publications

One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study

One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study

Three-dimensional Fermi surface and small effective masses in Mo8Ga41

Linear magnetoresistance with a universal energy scale in a strong-coupling superconductor

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Single-gap superconductivity in Mo8Ga41

Cited by 12 publications

References 25 publications

One or two gaps in Mo8Ga41 superconductor? Local Hall-probe magnetometry study

One or two gaps in Mo8Ga41 superconductor? Local Hall-probe magnetometry study

Three-dimensional Fermi surface and small effective masses in Mo8Ga41

Linear magnetoresistance with a universal energy scale in a strong-coupling superconductor

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Product

Resources

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One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study

One or two gaps in Mo₈Ga₄₁ superconductor? Local Hall-probe magnetometry study