scholarly journals Time-Reversal Symmetry Breaking in Re-Based Superconductors: Recent Developments

2021 ◽  
Vol 9 ◽  
Author(s):  
Tian Shang ◽  
Toni Shiroka
Keyword(s):  
Time Reversal ◽  
Muon Spin ◽  
High Sensitivity ◽  
Future Research ◽  
Time Reversal Symmetry ◽  
Key Factors ◽  
Satisfactory Explanation ◽  
Exciting Field ◽  
Promising Candidate ◽  
Recent Developments

In the recent search for unconventional- and topological superconductivity, noncentrosymmetric superconductors (NCSCs) rank among the most promising candidate materials. Surprisingly, some of them—especially those containing rhenium—seem to exhibit also time-reversal symmetry (TRS) breaking in their superconducting state, while TRS is preserved in many other isostructural NCSCs. To date, a satisfactory explanation for such discrepant behavior, albeit crucial for understanding the unconventional superconductivity of these materials, is still missing. Here we review the most recent developments regarding the Re-based class, where the muon-spin relaxation (μSR) technique plays a key role due to its high sensitivity to the weak internal fields associated with the TRS breaking phenomenon. We discuss different cases of Re-containing superconductors, comprising both centrosymmetric- and noncentrosymmetric crystal structures, ranging from pure rhenium, to ReT (T = 3d-5d early transition metals), to the dilute-Re case of ReBe22. μSR results suggest that the rhenium presence and its amount are two key factors for the appearance and the extent of TRS breaking in Re-based superconductors. Besides summarizing the existing findings, we also put forward future research ideas regarding the exciting field of materials showing TRS breaking.

scholarly journals Re1−xMox as an ideal test case of time-reversal symmetry breaking in unconventional superconductors

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Tian Shang ◽  
Christopher Baines ◽  
Lieh-Jeng Chang ◽  
Dariusz Jakub Gawryluk ◽  
Ekaterina Pomjakushina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Spin Relaxation ◽  
Time Reversal ◽  
Gradual Increase ◽  
Muon Spin ◽  
Superconducting Phase ◽  
Test Case ◽  
Time Reversal Symmetry ◽  
Key Factors ◽  
Unconventional Superconductors

Abstract Non-centrosymmetric superconductors (NCSCs) are promising candidates in the search for unconventional and topological superconductivity. The α-Mn-type rhenium-based alloys represent excellent examples of NCSCs, where spontaneous magnetic fields, peculiar to time-reversal symmetry (TRS) breaking, have been shown to develop in the superconducting phase. By converse, TRS is preserved in many other isostructural NCSCs, thus leaving the key question about its origin fully open. Here, we consider the superconducting Re1−xMox (0 ≤ x ≤ 1) family, which comprises both centro- and non-centrosymmetric structures and includes also two extra superconducting phases, β-CrFe and bcc-W. Muon-spin relaxation and rotation (μSR) measurements show a gradual increase of the relaxation rate below Tc, yet its independence of the crystal structure, suggesting that rhenium presence and its amount are among the key factors for the appearance and the extent of TRS breaking in the α-Mn-type NCSCs. The reported results propose Re1−xMox as an ideal test case for investigating TRS breaking in unconventional superconductors.

scholarly journals Detection of Time-Reversal Symmetry Breaking in the Noncentrosymmetric SuperconductorRe6ZrUsing Muon-Spin Spectroscopy

2014 ◽  
Vol 112 (10) ◽  
Author(s):  
R. P. Singh ◽  
A. D. Hillier ◽  
B. Mazidian ◽  
J. Quintanilla ◽  
J. F. Annett ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Muon Spin ◽  
Time Reversal Symmetry ◽  
Muon Spin Spectroscopy

scholarly journals Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductorLu5Rh6Sn18

2015 ◽  
Vol 91 (6) ◽  
Author(s):  
A. Bhattacharyya ◽  
D. T. Adroja ◽  
J. Quintanilla ◽  
A. D. Hillier ◽  
N. Kase ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Time Reversal ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Time Reversal Symmetry

scholarly journals Advances in synthetic gauge fields for light through dynamic modulation

2018 ◽  
Vol 5 (4) ◽  
pp. 172447 ◽  
Author(s):  
Daniel Hey ◽  
Enbang Li
Keyword(s):  
Magnetic Field ◽  
Gauge Field ◽  
Time Reversal ◽  
Higher Dimensions ◽  
Gauge Fields ◽  
Time Reversal Symmetry ◽  
Topological Properties ◽  
Dynamic Modulation ◽  
Recent Developments ◽  
Synthetic Gauge Fields

Photons are weak particles that do not directly couple to magnetic fields. However, it is possible to generate a photonic gauge field by breaking reciprocity such that the phase of light depends on its direction of propagation. This non-reciprocal phase indicates the presence of an effective magnetic field for the light itself. By suitable tailoring of this phase, it is possible to demonstrate quantum effects typically associated with electrons, and, as has been recently shown, non-trivial topological properties of light. This paper reviews dynamic modulation as a process for breaking the time-reversal symmetry of light and generating a synthetic gauge field, and discusses its role in topological photonics, as well as recent developments in exploring topological photonics in higher dimensions.

scholarly journals Time Reversal Symmetry Breaking Superconductors: Sr2RuO4 and Beyond

2019 ◽  
Vol 4 (2) ◽  
pp. 47 ◽  
Author(s):  
Karol Izydor Wysokiński
Keyword(s):  
Time Reversal ◽  
Kerr Effect ◽  
Muon Spin ◽  
P Wave ◽  
Time Reversal Symmetry ◽  
The Novel ◽  
Superconducting Transition ◽  
Spin Triplet ◽  
Orbital Character ◽  
Work Done

Recent work done on the time reversal symmetry (TRS) breaking superconductors is reviewed in this paper. The special attention is paid to Sr 2 RuO 4 believed to be spin triplet chiral p-wave superconductor which break TRS and is expected to posses non-trivial topological properties. The family of TRS breaking superconductors is growing relatively fast, with many of its newly discovered members being non-centrosymmetric. However not only Sr 2 RuO 4 but also many other superconductors which possess center of inversion also break TRS. The TRS is often identified by means of the muon spin relaxation ( μ SR) and the Kerr effect. Both methods effectively measure the appearance of the spontaneous bulk magnetic field below superconducting transition temperature. This compound provides an example of the material whose many band, multi-condensate modeling has enjoyed a number of successes, but the full understanding has not been achieved yet. We discuss in some details the properties of the material. Among them is the Kerr effect and by understanding has resulted in the discovery of the novel mechanism of the phenomenon. The mechanism is universal and thus applicable to all systems with multi-orbital character of states at the Fermi energy.

scholarly journals Review of Recent Microwave Planar Resonator-Based Sensors: Techniques of Complex Permittivity Extraction, Applications, Open Challenges and Future Research Directions

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2267
Author(s):  
Rammah Ali Alahnomi ◽  
Zahriladha Zakaria ◽  
Zulkalnain Mohd Yussof ◽  
Ayman Abdulhadi Althuwayb ◽  
Ammar Alhegazi ◽  
...  
Keyword(s):  
Complex Permittivity ◽  
Low Cost ◽  
High Sensitivity ◽  
Future Research ◽  
Beverage Industry ◽  
Compact Size ◽  
Industry Applications ◽  
Recent Developments ◽  
Sensitivity And Selectivity ◽  
Permittivity Measurements

Recent developments in the field of microwave planar sensors have led to a renewed interest in industrial, chemical, biological and medical applications that are capable of performing real-time and non-invasive measurement of material properties. Among the plausible advantages of microwave planar sensors is that they have a compact size, a low cost and the ease of fabrication and integration compared to prevailing sensors. However, some of their main drawbacks can be considered that restrict their usage and limit the range of applications such as their sensitivity and selectivity. The development of high-sensitivity microwave planar sensors is required for highly accurate complex permittivity measurements to monitor the small variations among different material samples. Therefore, the purpose of this paper is to review recent research on the development of microwave planar sensors and further challenges of their sensitivity and selectivity. Furthermore, the techniques of the complex permittivity extraction (real and imaginary parts) are discussed based on the different approaches of mathematical models. The outcomes of this review may facilitate improvements of and an alternative solution for the enhancement of microwave planar sensors’ normalized sensitivity for material characterization, especially in biochemical and beverage industry applications.

scholarly journals Chiral singlet superconductivity in the weakly correlated metal LaPt3P

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. K. Biswas ◽  
S. K. Ghosh ◽  
J. Z. Zhao ◽  
D. A. Mayoh ◽  
N. D. Zhigadlo ◽  
...  
Keyword(s):  
Time Reversal ◽  
Muon Spin ◽  
Mean Field Theory ◽  
Mean Field ◽  
Band Structure Calculation ◽  
Time Reversal Symmetry ◽  
Wave State ◽  
Linear Behaviour ◽  
Triplet Pairing ◽  
Breaking Time

AbstractChiral superconductors are novel topological materials with finite angular momentum Cooper pairs circulating around a unique chiral axis, thereby spontaneously breaking time-reversal symmetry. They are rather scarce and usually feature triplet pairing: a canonical example is the chiral p-wave state realized in the A-phase of superfluid He3. Chiral triplet superconductors are, however, topologically fragile with the corresponding gapless boundary modes only weakly protected against symmetry-preserving perturbations in contrast to their singlet counterparts. Using muon spin relaxation measurements, here we report that the weakly correlated pnictide compound LaPt3P has the two key features of a chiral superconductor: spontaneous magnetic fields inside the superconducting state indicating broken time-reversal symmetry and low temperature linear behaviour in the superfluid density indicating line nodes in the order parameter. Using symmetry analysis, first principles band structure calculation and mean-field theory, we unambiguously establish that the superconducting ground state of LaPt3P is a chiral d-wave singlet.

Sign in / Sign up

Export Citation Format

Share Document