Dimension of the collective pinning in the layered superconductor 2HNbSe2−xSx

Sugawara, Ken; Yokota, Kazuhide; Takei, Nobuo; Tanokura, Yoshiko; Sekine, Tomoyuki

doi:10.1016/0921-4526(94)91445-1

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“…However, in the 2H-Cu x NbSe 2 system, it is generally observed that the T c will drop off with an increased doping value when 'impurities' are introduced into an optimal superconductor, whereas modes in which T c declined under such instances is novel: an S-shaped superconducting phase diagram was obtained near x=0.03 with an inflection point, and there appeared to be a leveling off of the T c at about 3 K (the usual value of layered TMD) at high doping content. In contrast, there is a minor change in T c of the S substitution for Se in the 2H-NbSe 2 system [31,32].…”

Section: Introductionmentioning

confidence: 92%

“…Pristine 2H-NbSe 2 and 2H-NbS 2 are both multiband superconductors; the former has a CDW state but the latter does not [33][34][35]. On the other hand, S-doped 2H-NbSe 2 slightly affects the T c , but an unusual S-shaped superconducting phase diagram is observed when Cu ions intercalate into 2H-NbSe 2 [20,31,32]. 2H-NbSe 2 and 2H-NbS 2 thus open a door to the study of the interaction of CDW and multiband superconductivity phenomena in the bulk TMDs.…”

Section: Introductionmentioning

confidence: 99%

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The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂

Yan

Lin

Wang

et al. 2019

Supercond. Sci. Technol.

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2H-NbSe 2 is one of the most widely researched transition metal dichalcogenide (TMD) superconductors, which undergoes charge-density wave (CDW) transition at T CDW about 33 K and superconducting transition at T c of 7.3 K. To explore the relation between its superconductivity and Fermi surface nesting, we combined S substitution with Cu intercalation in 2H-NbSe 2 to make Cu x NbSe 2-y S y (0 ≤ x = y ≤ 0.1).Upon systematic substitution of S and intercalation of Cu ions into 2H-NbSe 2 , we found that when the Cu and S contents (x = y  0.06) increases, the T c decreases in Cu x NbSe 2-y S y . While at higher x and y values, T c keeps a constant value near 2 K, which is not commonly observed for a layered TMD. For comparison, we found the simultaneous substitution of Nb by Cu and Se by S in Cu x Nb 1-x Se 2-y S y (0 ≤ x = y ≤ 0.06) lowered the T c substantially faster. We construct a superconducting phase diagrams for our double-doping compounds in contrast with the related single-ions doping systems.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂

Yan

Lin

Wang

et al. 2019

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Dimension of the collective pinning in the layered superconductor 2HNbSe2−xSx

Cited by 1 publication

References 5 publications

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂

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Dimension of the collective pinning in the layered superconductor 2HNbSe2−xSx

Cited by 1 publication

References 5 publications

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe2

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe2

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The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂

The unusual suppression of superconducting transition temperature in double-doping 2H-NbSe₂