scholarly journals An unconventional superconductor isn’t so odd after all

Physics Today ◽  
2021 ◽  
Vol 74 (9) ◽  
pp. 14-16
Author(s):  
Alex Lopatka
Keyword(s):  
Unconventional Superconductor

scholarly journals Single-Crystal Growth of Sr2RuO4 by the Floating-Zone Method Using an Infrared Image Furnace with Improved Halogen Lamps

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 392
Author(s):  
Naoki Kikugawa ◽  
Dmitry A. Sokolov ◽  
Tohru Nagasawa ◽  
Andrew P. Mackenzie
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Infrared Image ◽  
Single Crystal Growth ◽  
Molten Zone ◽  
Floating Zone ◽  
Unconventional Superconductor ◽  
Zone Method ◽  
Floating Zone Method ◽  
Halogen Lamps

We report the single-crystal growth of the unconventional superconductor Sr2RuO4, on which research has reached a turning point recently. In order to optimize the quality of crystals grown by the floating-zone method using an infrared image furnace, we focus on an improvement of the structure of the filament in the halogen lamps. By reducing the thickness of the total filament, the form of the molten zone was narrowed. More importantly, the molten zone was observed to be more stable during the growth process. Finally, we obtained the crystals with a length of 12 cm. Additionally, the grown crystal has high quality, displaying the 1.5 K transition temperature expected only for the purest crystals. We also discuss the availability of the newly developed halogen lamps.

scholarly journals Influence of the impurity scattering on charge transport in unconventional superconductor junctions

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
Bo Lu ◽  
Pablo Burset ◽  
Yasunari Tanuma ◽  
Alexander A. Golubov ◽  
Yasuhiro Asano ◽  
...  
Keyword(s):  
Charge Transport ◽  
Impurity Scattering ◽  
Unconventional Superconductor

scholarly journals NMR Shift Measurements of69Ga in Unconventional Superconductor PuRhGa5

2006 ◽  
Vol 75 (Suppl) ◽  
pp. 50-52 ◽  
Author(s):  
Hironori Sakai ◽  
Yo Tokunaga ◽  
Tatsuya Fujimoto ◽  
Shinsaku Kambe ◽  
Russell E. Walstedt ◽  
...  
Keyword(s):  
Unconventional Superconductor

UNCONVENTIONAL SUPERCONDUCTIVITY IN UPt3: FREQUENCY DEPENDENT AC SUSCEPTIBILITY

1993 ◽  
Vol 07 (01n03) ◽  
pp. 18-21
Author(s):  
Z. KOZIOL ◽  
J. J. M. FRANSE ◽  
A. A. MENOVSKY
Keyword(s):  
Normal State ◽  
Surface Resistance ◽  
Skin Effect ◽  
Ac Susceptibility ◽  
Response Characteristic ◽  
Complex Conductivity ◽  
Unconventional Superconductivity ◽  
Superconducting Transition ◽  
Good Qualitative Agreement ◽  
Unconventional Superconductor

A method has been developed for measuring and analysing the complex ac susceptibility of a metal undergoing a superconducting transition, in case there exists an interplay between the normal-state skin-effect and the response characteristic for the superconducting state. For the unconventional superconductor UPt 3, the study of the temperature and frequency dependence of the complex conductivity close to T c has resulted in predictions for the surface resistance and the radio-frequency susceptibility which are in a good qualitative agreement with published experimental results.

scholarly journals Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate-valence UTe2

2020 ◽  
Vol 6 (42) ◽  
pp. eabc8709 ◽  
Author(s):  
S. M. Thomas ◽  
F. B. Santos ◽  
M. H. Christensen ◽  
T. Asaba ◽  
F. Ronning ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Applied Pressure ◽  
Quantum Critical Point ◽  
Antiferromagnetic Order ◽  
Intermediate Valence ◽  
Ac Calorimetry ◽  
Unconventional Superconductor ◽  
Spin Triplet ◽  
Magnetic States ◽  
Low Pressures

UTe2 is a recently discovered unconventional superconductor that has attracted much interest because of its potentially spin-triplet topological superconductivity. Our ac calorimetry, electrical resistivity, and x-ray absorption study of UTe2 under applied pressure reveals key insights on the superconducting and magnetic states surrounding pressure-induced quantum criticality at Pc1 = 1.3 GPa. First, our specific heat data at low pressures, combined with a phenomenological model, show that pressure alters the balance between two closely competing superconducting orders. Second, near 1.5 GPa, we detect two bulk transitions that trigger changes in the resistivity, which are consistent with antiferromagnetic order, rather than ferromagnetism. Third, the emergence of magnetism is accompanied by an increase in valence toward a U4+ (5f2) state, which indicates that UTe2 exhibits intermediate valence at ambient pressure. Our results suggest that antiferromagnetic fluctuations may play a more substantial role on the superconducting state of UTe2 than previously thought.

scholarly journals Observation of half-quantum flux in the unconventional superconductor β-Bi2Pd

Science ◽  
2019 ◽  
Vol 366 (6462) ◽  
pp. 238-241 ◽  
Author(s):  
Yufan Li ◽  
Xiaoying Xu ◽  
M.-H. Lee ◽  
M.-W. Chu ◽  
C. L. Chien
Keyword(s):  
Magnetic Flux ◽  
Pairing Symmetry ◽  
Quantum Oscillation ◽  
Unconventional Superconductivity ◽  
Unconventional Superconductor ◽  
Quantum Bits ◽  
Flux Quantization ◽  
Triplet Pairing ◽  
Quantum Flux ◽  
Spin Triplet

Magnetic flux quantization is one of the defining properties of a superconductor. We report the observation of half-integer magnetic flux quantization in mesoscopic rings of superconducting β-Bi2Pd thin films. The half-quantum fluxoid manifests itself as a π phase shift in the quantum oscillation of the superconducting critical temperature. This result verifies unconventional superconductivity of β-Bi2Pd and is consistent with a spin-triplet pairing symmetry. Our findings may have implications for flux quantum bits in the context of quantum computing.

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