"Checkerboard stripe" electronic state on cleaved surface of NdO0.7F0.3BiS2 probed by scanning tunneling microscopy

Tadashi Machida; Yuita Fujisawa; Masanori Nagao; Satoshi Demura; Keita Deguchi; Yoshikazu Mizuguchi; Yoshihiko Takano; Hideaki Sakata

doi:10.7566/JPSJ.83.113701

"Checkerboard stripe" electronic state on cleaved surface of NdO_0.7F_0.3BiS₂ probed by scanning tunneling microscopy

Tadashi Machida, Yuita Fujisawa, Masanori Nagao, Satoshi Demura, Keita Deguchi, Yoshikazu Mizuguchi, Yoshihiko Takano, Hideaki Sakata

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

We present scanning tunneling microscopy measurements on a cleaved surface of the recently discovered superconductor NdO_0.7F_0.3BiS₂ with a transition temperature (T_c) of 5.1 K. Tunneling spectra at 4.2K (below T_c) and 22K (above T_c) show a large spectroscopic gap (∼40 mV), which is inconsistent with the metallic nature demonstrated in bulk measurements. Moreover, we find two interesting real-space electronic features. The first feature is a "checkerboard stripe" electronic state characterized by an alternating arrangement of two types of nanocluster. In one cluster, one-dimensional electronic stripes run along one Bi-Bi direction, whereas, in the other cluster, the stripes run along the other Bi Bi direction. The second feature is a nanoscale electronic inhomogeneity whose microscopic source seems to be atomic defects on the cleaved surface or dopant F atoms.

Original language	English
Article number	113701
Journal	Journal of the Physical Society of Japan
Volume	83
Issue number	11
DOIs	https://doi.org/10.7566/JPSJ.83.113701
Publication status	Published - 15 Nov 2014
Externally published	Yes

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title = "{"}Checkerboard stripe{"} electronic state on cleaved surface of NdO0.7F0.3BiS2 probed by scanning tunneling microscopy",

abstract = "We present scanning tunneling microscopy measurements on a cleaved surface of the recently discovered superconductor NdO0.7F0.3BiS2 with a transition temperature (Tc) of 5.1 K. Tunneling spectra at 4.2K (below Tc) and 22K (above Tc) show a large spectroscopic gap (∼40 mV), which is inconsistent with the metallic nature demonstrated in bulk measurements. Moreover, we find two interesting real-space electronic features. The first feature is a {"}checkerboard stripe{"} electronic state characterized by an alternating arrangement of two types of nanocluster. In one cluster, one-dimensional electronic stripes run along one Bi-Bi direction, whereas, in the other cluster, the stripes run along the other Bi Bi direction. The second feature is a nanoscale electronic inhomogeneity whose microscopic source seems to be atomic defects on the cleaved surface or dopant F atoms.",

author = "Tadashi Machida and Yuita Fujisawa and Masanori Nagao and Satoshi Demura and Keita Deguchi and Yoshikazu Mizuguchi and Yoshihiko Takano and Hideaki Sakata",

note = "Publisher Copyright: Copyright {\textcopyright} 2014 The Physical Society of Japan.",

year = "2014",

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doi = "10.7566/JPSJ.83.113701",

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T1 - "Checkerboard stripe" electronic state on cleaved surface of NdO0.7F0.3BiS2 probed by scanning tunneling microscopy

AU - Machida, Tadashi

AU - Fujisawa, Yuita

AU - Nagao, Masanori

AU - Demura, Satoshi

AU - Deguchi, Keita

AU - Mizuguchi, Yoshikazu

AU - Takano, Yoshihiko

AU - Sakata, Hideaki

PY - 2014/11/15

Y1 - 2014/11/15

N2 - We present scanning tunneling microscopy measurements on a cleaved surface of the recently discovered superconductor NdO0.7F0.3BiS2 with a transition temperature (Tc) of 5.1 K. Tunneling spectra at 4.2K (below Tc) and 22K (above Tc) show a large spectroscopic gap (∼40 mV), which is inconsistent with the metallic nature demonstrated in bulk measurements. Moreover, we find two interesting real-space electronic features. The first feature is a "checkerboard stripe" electronic state characterized by an alternating arrangement of two types of nanocluster. In one cluster, one-dimensional electronic stripes run along one Bi-Bi direction, whereas, in the other cluster, the stripes run along the other Bi Bi direction. The second feature is a nanoscale electronic inhomogeneity whose microscopic source seems to be atomic defects on the cleaved surface or dopant F atoms.

AB - We present scanning tunneling microscopy measurements on a cleaved surface of the recently discovered superconductor NdO0.7F0.3BiS2 with a transition temperature (Tc) of 5.1 K. Tunneling spectra at 4.2K (below Tc) and 22K (above Tc) show a large spectroscopic gap (∼40 mV), which is inconsistent with the metallic nature demonstrated in bulk measurements. Moreover, we find two interesting real-space electronic features. The first feature is a "checkerboard stripe" electronic state characterized by an alternating arrangement of two types of nanocluster. In one cluster, one-dimensional electronic stripes run along one Bi-Bi direction, whereas, in the other cluster, the stripes run along the other Bi Bi direction. The second feature is a nanoscale electronic inhomogeneity whose microscopic source seems to be atomic defects on the cleaved surface or dopant F atoms.

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U2 - 10.7566/JPSJ.83.113701

DO - 10.7566/JPSJ.83.113701

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AN - SCOPUS:84919689347

SN - 0031-9015

VL - 83

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 11

M1 - 113701

ER -

"Checkerboard stripe" electronic state on cleaved surface of NdO_0.7F_0.3BiS₂ probed by scanning tunneling microscopy

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