Campbell penetration depth in low carrier density superconductor YPtBi

Kim, H.; Tanatar, M. A.; Hodovanets, Halyna; Wang, Kefeng; Paglione, Johnpierre; Prozorov, Ruslan

doi:10.1103/physrevb.104.014510

Cited by 6 publications

(5 citation statements)

References 58 publications

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“…Although Rh 17 S 15 is a multiband material, as shown by band structure calculations 36 and Hall effect measurements 32 , its superconducting state is characterized by a single gap, consistent with conclusions from heat capacity measurements 16 . Similar behavior is observed in other materials, for example, SrPd 2 Ge 2 , in which a sign-changing Hall effect suggests multi-band transport in the normal state 37 , but the superconductivity is still characterized by a single isotropic gap 38 .…”

Section: Superfluid Density and Superconducting Energy Gapsupporting

confidence: 80%

Nodal superconductivity in miassite Rh17S15

Kim,

Tanatar,

Kończykowski

et al. 2024

Commun Mater

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Solid state chemistry has produced a plethora of materials with properties not found in nature. For example, high-temperature superconductivity in cuprates is drastically different from the superconductivity of naturally occurring metals and alloys and is frequently referred to as unconventional. Unconventional superconductivity is also found in other synthetic compounds, such as iron-based and heavy-fermion superconductors. Here, we report compelling evidence of unconventional nodal superconductivity in synthetic samples of Rh17S15 (Tc = 5.4 K), which is also found in nature as the mineral miassite. We investigated the temperature-dependent variation of the London penetration depth Δλ(T) and the disorder evolution of the critical superconducting temperature Tc and the upper critical field Hc2(T) in single crystalline Rh17S15. We found a T − linear temperature variation of Δλ(T) below 0.3Tc, which is consistent with the presence of nodal lines in the superconducting gap of Rh17S15. The nodal character of the superconducting state is supported by the observed suppression of Tc and Hc2(T) in samples with a controlled level of non-magnetic disorder introduced by 2.5 MeV electron irradiation. We propose a nodal sign-changing superconducting gap in the A1g irreducible representation, which preserves the cubic symmetry of the crystal and is in excellent agreement with the derived superfluid density. To the best of our knowledge, this establishes miassite as the only mineral known so far that reveals unconventional superconductivity in its clean synthetic form, though it is unlikely that it is present in natural crystals because of unavoidable impurities that quickly destroy nodal superconductivity.

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Section: Superfluid Density and Superconducting Energy Gapsupporting

confidence: 80%

Nodal superconductivity in miassite Rh17S15

Kim,

Tanatar,

Kończykowski

et al. 2024

Commun Mater

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“…Let us consider square vortex lattice for the sake of simplicity in our calculation 147 , where the positions of a certain vortex are given by x and u is the displacement of that vortex due to external ac excitation. In the absence of excitation, the distance between consecutive vortices is given the vortex lattice constant, a 0 = Φ 0 /B 0 , where B 0 is the unperturbed magnetic induction.…”

Section: Campbell Penetration Depthmentioning

confidence: 99%

Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a−MoGe Thin Film

et al. 2019

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The hexatic fluid refers to a phase in between a solid and a liquid which has short range positional order but quasi-long range orientational order. In the celebrated theory of Berezinskii, Kosterlitz and Thouless and subsequently refined by Halperin, Nelson and Young, it was predicted that a 2-dimensional hexagonal solid can melt in two steps: first, through a transformation from a solid to a hexatic fluid which retains quasi long range orientational order and then from a hexatic fluid to an isotropic liquid. In this paper, using a combination of real space imaging and transport measurements we show that the 2dimensional vortex lattice in a-MoGe thin film follows this sequence of melting as the magnetic field is increased. Identifying the signatures of various transitions on the bulk transport properties of the superconductor, we construct a vortex phase diagram for a two dimensional superconductor.

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“…Error for the parameters determined following the protocol explained in appendix. 15 kOe. This minimum is qualitatively to that observed in the variation of J c with field measured on similar samples [31] and can be based on the theory of collective Within Larkin-Ovchinnikov [38] theory of collective pinning, the pinning force on a vortex (per unit length) for a displacement u is given by,…”

Section: Discussionmentioning

confidence: 99%

“…(2) has a form similar to the usual London equation, but the London 12 penetration depth (𝜆 𝐿 ) is replaced by the effective complex penetration depth (𝜆 𝑒𝑓𝑓 = √(𝜆 𝐿 2 + 𝜙 0 𝐵 𝜇 0 (𝛼 𝐿 +𝑖𝜔𝜂) )). The Campbell penetration depth 13,14,15 , 𝜆 𝐶 = (…”

Section: Introductionmentioning

confidence: 99%

Study of vortex dynamics in an a-MoGe thin film using low-frequency two-coil mutual inductance measurements

Mandal¹,

Basistha²,

Jesudasan³

et al. 2022

Supercond. Sci. Technol.

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We extract the vortex lattice parameters using low-frequency two-coil mutual inductance measurements in a 20-nm-thick superconducting a-MoGe thin film. We fit the temperature dependence of ac penetration depth in the mixed state using a model developed by Coffey and Clem and demonstrate a procedure for extracting vortex lattice parameters such as pinning constant, vortex lattice drag coefficient, and pinning potential barrier. We show that the extracted parameters follow the magnetic field variation expected for a weakly pinned 2-dimensional vortex lattice.

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Campbell penetration depth in low carrier density superconductor YPtBi

Cited by 6 publications

References 58 publications

Nodal superconductivity in miassite Rh17S15

Nodal superconductivity in miassite Rh17S15

Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a−MoGe Thin Film

Study of vortex dynamics in an a-MoGe thin film using low-frequency two-coil mutual inductance measurements

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