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Nodal gap detection through polar angle resolved density-of-states measurements | | Yasumasa Tsutsumi
; Takuya Nomoto
; Hiroaki Ikeda
; Kazushige Machida
; | | Date: |
11 Apr 2016 | | Abstract: | We propose a spectroscopic method to identify the nodal gap structure in
unconventional superconductors. This method best suits for locating the
horizontal line node and for pinpointing the isolated point nodes by measuring
polar angle ($ heta$) resolved zero energy density of states $N( heta)$ via
specific heat or thermal conductivity at low temperatures under a magnetic
field. We examine a variety of nodal structure, including point and/or line
nodes with linear and quadratic dispersions, by solving Eilenberger equation in
vortex states. We find that (1) the maxima of $N( heta)$ continuously shift
from the anti-nodal to the nodal direction ($ heta_{
m n}$) as a field
increases, and thus, (2) the oscillation pattern reverses at low and high
fields. Furthermore, (3) local minima emerge next to $ heta_{
m n}$ on both
sides except for the case of linear point node. These features are robust and
detectable experimentally. | | Source: | arXiv, 1604.2806 | | Services: | Forum | Review | PDF | Favorites | |
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