scholarly journals Relation of Superconducting Pairing Symmetry and Non-Magnetic Impurity Effects in Vortex States

Symmetry ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 175
Author(s):  
Yasuaki Sera ◽  
Takahiro Ueda ◽  
Hiroto Adachi ◽  
Masanori Ichioka

Non-magnetic impurity scattering effects on the vortex core states are theoretically studied to clarify the contributions from the sign-change of the pairing function in anisotropic superconductors. The vortex states are calculated by the Eilenberger theory in superconductors with p x -wave pairing symmetry, as well as the corresponding anisotropic s-wave symmetry. From the spatial structure of the pair potential and the local electronic states around a vortex, we examine the differences between anisotropic superconductors with and without sign-change of the pairing function, and estimate how twofold symmetric vortex core images change with increasing the impurity scattering rate both in the Born and the unitary limits. We found that twofold symmetric vortex core image of zero-energy local density of states changes the orientation of the twofold symmetry with increasing the scattering rate when the sign change occurs in the pairing function. Without the sign change, the vortex core shape reduces to circular one with approaching dirty cases. These results of the impurity effects are valuable for identifying the pairing symmetry by observation of the vortex core image by the STM observation.

2013 ◽  
Vol 484 ◽  
pp. 69-73 ◽  
Author(s):  
Nobuhiko Hayashi ◽  
Yoichi Higashi ◽  
Noriyuki Nakai ◽  
Hisataka Suematsu

1996 ◽  
Author(s):  
Robert J. Soulen, Jr. ◽  
Stuart A. Wolf ◽  
S. D. Adrian ◽  
Oleg V. Dolgov ◽  
S. V. Shulga ◽  
...  

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3436-3440 ◽  
Author(s):  
C. Boekema ◽  
Y. Tien ◽  
L. Hughes ◽  
E. J. Ruiz ◽  
S. X. Cavanaugh

Maximum-Entropy (ME) analysis is applied to muon-spin-rotation (μSR) data of RBa 2 Cu 3 O y (RBCO; R = Ho , Eu) vortex states. Our focus is on the prospect of antiferromagnetism (AF) associated with the vortex core. The ME transforms are fitted by two μSR signals: the vortex signal and the grain-boundary (GB) signal. Below Tc, the GB signals are well fitted by Gaussians for both EuBCO (Tc = 94 K ) and underdoped HoBCO (Tc = 66 K ). Below 0.5Tc, EuBCO and HoBCO vortex signals are best fitted using Lorentzians, instead of expected Gaussians. An estimate for an effective Neél temperature of an AF vortex core is about 30 K. Our AF-core search results for RBCO vortex states are discussed considering a magnetic origin of cuprate superconductivity.


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