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Probing itinerant antiferromagnetism with $d$-wave Andreev reflection spectroscopy | | C. R. Granstrom
; R.-X. Liang
; Y. Li
; P. Li
; Z.-H. Lu
; E. Svanidze
; E. Morosan
; J. Y. T. Wei
; | | Date: |
Wed, 31 Oct 2018 23:54:05 GMT (1823kb) | | Abstract: | To study how Andreev reflection (AR) is affected by itinerant
antiferromagnetism, we perform $d$-wave AR spectroscopy with superconducting
YBa$_2$Cu$_3$O$_{7-delta}$ on TiAu and on variously-oxidized Nb (NbO$_x$)
samples. X-ray photoelectron spectroscopy is also used on the latter to measure
their surface oxide composition. Below the N’eel temperatures ($T_N$) of both
TiAu and NbO$_x$, the conductance spectra show a dip-like structure instead of
a zero-bias peak within the superconducting energy gap; for NbO$_x$,
higher-oxidized samples show a stronger spectral dip at zero bias. These
observations indicate that itinerant antiferromagnetic order suppresses the AR
process. Interestingly, the spectral dip persists above $T_N$ for both TiAu and
NbO$_x$, implying that spin fluctuations can also suppress AR. Our results
suggest that $d$-wave AR spectroscopy may be used to probe the degree of spin
ordering in itinerant antiferromagnets. | | Source: | arXiv, 1811.0160 | | Services: | Forum | Review | PDF | Favorites | |
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