Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films

Vicente, C. L.; Qin, Yongguang; Yoon, Jaewon

doi:10.1103/physrevb.74.100507

Cited by 10 publications

(11 citation statements)

References 24 publications

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“…With strengthening field, the width of the interval of the superconducting currents decreases (curves at B=1.5 and 2.5 T) and in the vicinity of the critical field B c the minimum of dV /dJ(J ) near J = 0 transforms into a maximum. The same transformation of the dV /dJ curves in the vicinity of the zero current in fields of order B c was also observed in other materials in the neighborhood of superconductor-insulator transitions, e.g., in InO [153] and Ta [154] (Fig. 42b).…”

Section: Current-voltage Characteristics and Nonlinear Phenomenasupporting

confidence: 78%

“…FIG.42: Differential resistance ∂V /∂J of films near the superconductor-insulator transition in various magnetic fields as a function of a dc current through the film. The measurement temperature was less than 0.1 K. (a) TiN film 5 nm thick with a superconducting transition temperature Tc ≈ 1 K[152]; signs of hysteresis phenomena are seen in the curves at B = 1 and 1.5 T. (b) Ta films 5 nm thick with Tc ≈ 0.67 K[154].…”

mentioning

confidence: 99%

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Superconductor-insulator quantum phase transition

Gantmakher¹,

Dolgopolov²

2010

Usp. Fiz. Nauk

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Section: Current-voltage Characteristics and Nonlinear Phenomenasupporting

confidence: 78%

mentioning

confidence: 99%

Superconductor-insulator quantum phase transition

Gantmakher¹,

Dolgopolov²

2010

Usp. Fiz. Nauk

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“…There was no sign of transition from the metallic phase to the superconducting vortex solid (vortex glass or Bragg glass with Rsheet 0) as seen in Bi2Sr2CaCu2O8 single crystals150 and YBa2Cu3Oy ultra-thin films15 . A similar phenomenon has been observed in weak pinning systems such as amorphous MoGe 50,151,152 , MoSi 153 , Ta13,[154][155][156]…”

supporting

confidence: 77%

Highly crystalline 2D superconductors

2016

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Recent technological advances in controlling materials have developed methods to produce idealized two-dimensional (2D) electron systems such as heterogeneous interfaces, molecularbeam-epitaxy (MBE) grown atomic layers, exfoliated thin flakes and field-effect devices.These 2D electron systems are highly-crystalline with less disorder in common, some of which indeed show sheet resistance more than one order of magnitude lower even in atomic layers or single layers than that of conventional amorphous/granular thin films. Here, we present a review on the recent developments of highly-crystalline 2D superconductors and a series of unprecedented physical properties discovered in these systems. In particular, we highlight the quantum metallic state (or possible metallic ground state), the quantum Griffiths phase in outof-plane magnetic fields, and the superconducting state maintained in anomalously large inplane magnetic fields, which were observed in exfoliated 2D materials, MBE-grown atomiclayer thin films and electric-double-layer (ion-gated) interfaces. These phenomena are discussed on the basis of weakened disorder and/or broken spatial inversion symmetry. These novel aspects suggest that highly-crystalline 2D systems are promising platforms for exploring new quantum physics and superconductors.

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“…5c). In the past, such concurrent variations of linear and non-linear resistance have been taken as evidence for superconductor-insulator transitions in resistively-shunted single Josephson junction, 39 onedimensional (1d) Josephson junction arrays, 40 superconducting nanowires 41,42 and films, 43,44 and for the metal-insulator transition in multilayer MoS 2 . 45 This variation is indeed expected from the general scaling equation, Eq.1, which states that at the critical field and fixed temperature the resistance of a system should not depend on electrical field, regardless of the system dimension.…”

Section: 4 B ≈ −mentioning

confidence: 99%

Deficiency of the scaling collapse as an indicator of a superconductor-insulator quantum phase transition

Rogachev

Sacépé

2020

Phys. Rev. B

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Finite-size scaling analysis is a well-accepted method for identification and characterization of quantum phase transitions (QPTs) in superconducting, magnetic and insulating systems. We formally apply this analysis in the form suitable for QPTs in 2-dimensional superconducting films to magnetic-field driven superconductor-metal transition in 1-dimensional MoGe nanowires. Despite being obviously inapplicable to nanowires, the 2d scaling equation leads to a high-quality scaling collapse of the nanowire resistance in the temperature and resistance ranges comparable or better to what is accepted in the analysis of the films. Our results suggest that the appearance and the quality of the scaling collapse by itself is not a reliable indicator of a QPT. We have also observed a sign-change of the zero-bias anomaly (ZBA) in the non-linear resistance, occurring exactly at the critical field of the accidental QPT. This behavior is often taken as an additional confirmation of the transition. We argue that in nanowires, the non-linearity is caused by electron heating and has no relation to the critical fluctuations. Our observation suggests that similar to the scaling collapse, the sign-change of ZBA can be a misleading indicator of QPT.Quantum phase transitions (QPT) occur at zero temperature between distinct ground states of matter; they are driven by a non-thermal parameter, g , which can be, for example, pressure or magnetic field. QPTs take place in many systems ranging from magnetic materials 1,2,3 and superconductors 4,5,6,7to cold atoms, 8 atomic nuclei 9,10 and stars. 11 The transition from one ground state to another can be of the first order, as in the case of clean metallic ferromagnets.12 It can also proceed by a smooth evolution of one-ground state to another over broad range of the driving parameter, as in the case of the crossover from Bardeen-Cooper-Schrieffer superconductivity to Bose-Einstein condensation.13 But, perhaps the most interesting is the case of continuous QPTs, which is characterized by the change of the ground state at certain critical value c

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Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films

Cited by 10 publications

References 24 publications

Superconductor-insulator quantum phase transition

Superconductor-insulator quantum phase transition

Highly crystalline 2D superconductors

Deficiency of the scaling collapse as an indicator of a superconductor-insulator quantum phase transition

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