Superconductivity with broken time-reversal symmetry inside a superconducting s-wave state

Grinenko, V.; Sarkar, Rajib; Kihou, Kunihiro; Lee, Chul‐Ho; Morozov, Igor; Aswartham, Saicharan; Büchner, B.; Chekhonin, Paul; Skrotzki, Werner; Nenkov, K.; Hühne, Ruben; Nielsch, Kornelius; Drechsler, S.‐L.; Vadimov, Vasilii; Силаев, М. А.; Volkov, Pavel A.; Eremin, I.; Luetkens, H.; Klauß, H.‐H.

doi:10.1038/s41567-020-0886-9

Cited by 90 publications

(86 citation statements)

References 50 publications

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“…In the most recent proposal [15], it was suggested that for models relevant for Ba 1−x K x Fe 2 As 2 one can distinguish between s + is and s + id superconductors. It also supported the material being a s + is state [2].…”

Section: Introductionmentioning

confidence: 54%

“…The coefficients used in Eqs. (2) and 3are systematically obtained from the microscopic coupling matrixˆ and from T /T c as reported in the Appendix. We are interested in analyzing s + is and s + id states, a key feature of which is a Z 2 degeneracy in the ground state.…”

Section: Ginzburg-landau Formulationmentioning

confidence: 99%

“…Although a number of candidate materials was discovered, the nature of their order parameters remains a subject of debate. Recent experimental works in iron-based superconductors reported spontaneous breakdown of timereversal symmetry (BTRS) in Ba 1−x K x Fe 2 As 2 [1,2], based on muon spin rotation measurements. The leading candidates for the BTRS state in Fe-based compounds are s + is and s + id states [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The leading candidates for the BTRS state in Fe-based compounds are s + is and s + id states [3][4][5][6][7][8]. The experiments [1,2], detected spontaneous magnetic fields appearing in superconducting states. These are believed to be a hallmark of the spontaneous breakdown of time-reversal symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we focus on a simple feature to measure and compare, showing how the states can be diagnosed via the observation of the magnetic field of domain walls separating s + is and s − is or s + id and s − id domains. This can be observed in scanning superconducting quantum interference device (SQUID), scanning Hall probes [22][23][24][25], and muon spin rotation [2].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

et al. 2020

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One of the defining features of spontaneously broken time-reversal symmetry (BTRS) is the existence of domain walls, the detection of which would be strong evidence for such systems. There is keen interest in BTRS currently, in part, due to recent muon spin rotation experiments, which have pointed towards Ba 1−x K x Fe 2 As 2 exhibiting a remarkable case of s-wave superconductivity with spontaneously broken time-reversal symmetry. A key question, however, is how to differentiate between the different theoretical models which describe such a state. Two particularly popular choices of model are s + is and s + id superconducting states. In this paper, we obtain solutions for domain walls in s + is and s + id systems, including the effects of lattice anisotropies. We show that, in general, both models exhibit spontaneous magnetic fields that extend along the entire length of the domain wall. We demonstrate the qualitative difference between the magnetic signatures of s + is and s + id domain walls and propose a procedure to extract the superconducting pairing symmetry from the magnetic-field response of domain walls.

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Section: Introductionmentioning

confidence: 54%

Section: Ginzburg-landau Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

et al. 2020

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Evidence of Nodal Superconductivity in Monolayer 1H‐TaS₂ with Hidden Order Fluctuations

Vaňo,

Ganguli,

Amini

et al. 2023

Advanced Materials

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Unconventional superconductors represent one of the fundamental directions in modern quantum materials research. In particular, nodal superconductors are known to appear naturally in strongly correlated systems, including cuprate superconductors and heavy‐fermion systems. Van der Waals materials hosting superconducting states are well known, yet nodal monolayer van der Waals superconductors have remained elusive. Here, using low‐temperature scanning tunneling microscopy (STM) and spectroscopy (STS) experiments, we show that pristine monolayer 1H‐TaS2 realizes a nodal superconducting state. By including non‐magnetic disorder, we drive the nodal superconducting state to a conventional gapped s‐wave state. Furthermore, we observe the emergence of many‐body excitations close to the gap edge, signalling a potential unconventional pairing mechanism. Our results demonstrate the emergence of nodal superconductivity in a van der Waals monolayer, providing a building block for van der Waals heterostructures exploiting unconventional superconducting states.This article is protected by copyright. All rights reserved

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Spontaneous Symmetry Breaking of Achiral Molecules Leading to the Formation of Homochiral Superstructures that Exhibit Mechanoluminescence

Liu,

Ye,

Chen

et al. 2024

Angewandte Chemie

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Chirality, with its intrinsic symmetry‐breaking feature, is frequently utilized in the creation of acentric crystalline functional materials that exhibit intriguing optoelectronic properties. On the other hand, the development of chiral crystals from achiral molecules offers a solution that bypasses the need for enantiopure motifs, presenting a promising alternative and thereby expanding the possibilities of the self‐assembly toolkit. Nevertheless, the rational design of achiral molecules that prefer spontaneous symmetry breaking during crystallization has so far been obscure. In this study, we present a series of six achiral molecules, demonstrating that when these conformationally flexible molecules adopt a cis‐conformation and engage in multiple non‐covalent interactions along a helical path, they collectively self‐assemble into chiral superstructures consisting of single‐handed supramolecular columns. When these homochiral supramolecular columns align in parallel, they form polar crystals that exhibit intense luminescence upon grinding or scraping. We therefore demonstrate our molecular design strategy could significantly increase the likelihood of symmetry breaking in achiral molecular synthons during self‐assembly, offering a facile access to novel chiral crystalline materials with unique optoelectronic properties.

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Superconductivity with broken time-reversal symmetry inside a superconducting s-wave state

Cited by 90 publications

References 50 publications

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

Evidence of Nodal Superconductivity in Monolayer 1H‐TaS₂ with Hidden Order Fluctuations

Spontaneous Symmetry Breaking of Achiral Molecules Leading to the Formation of Homochiral Superstructures that Exhibit Mechanoluminescence

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Superconductivity with broken time-reversal symmetry inside a superconducting s-wave state

Cited by 90 publications

References 50 publications

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

Magnetic signatures of domain walls in s+is and s+id superconductors: Observability and what that can tell us about the superconducting order parameter

Evidence of Nodal Superconductivity in Monolayer 1H‐TaS2 with Hidden Order Fluctuations

Spontaneous Symmetry Breaking of Achiral Molecules Leading to the Formation of Homochiral Superstructures that Exhibit Mechanoluminescence

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Product

Resources

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Evidence of Nodal Superconductivity in Monolayer 1H‐TaS₂ with Hidden Order Fluctuations