TY - JOUR
T1 - Modification of the synthesis of layered titanium chloride nitride
AU - Tanaka, Masashi
AU - Kataoka, Noriyuki
AU - Kobayashi, Haruya
AU - Fujioka, Masaya
AU - Oda, Masaru
AU - Yamamoto, Aishi
AU - Terashima, Kensei
AU - Nishii, Junji
AU - Tanaka, Hiromi
AU - Yokoya, Takayoshi
N1 - Funding Information:
The authors express their immeasurable gratitude to Emeritus Professor Shoji Yamanaka of Hiroshima University for his helpful suggestions throughout this study. This work was partly supported by the Japan Society for the Promotion of Science (JSPS) through JSPS KAKENHI Grant Numbers JP18K04707 , JP21K19018 , JP22K05289 , and Promotion of Joint International Research (B) (JP18KK0076) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and Japan Science and Technology Agency (JST) CREST, grant number JPMJCR19J1 . The photoemission measurements were supported by Research Grant for Encouragement of Students, Graduate School of Natural Science and Technology, Okayama University. The authors would like to thank Enago ( www.enago.jp ) for the English language review.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/9
Y1 - 2022/9
N2 - Layered titanium nitride chloride (TiNCl) exhibits a relatively high superconducting transition of ∼16 K, and it is a candidate for the unconventional superconductor. To better understand the superconductivity, we modified the synthesis process for TiNCl. Highly crystalline TiNCl was prepared by chemical vapor transport at different transport temperatures and intercalated with sodium (Na) metal. Although the crystallographic parameters obtained through Rietveld refinement are similar, the superconducting properties strongly depend on the treatment temperature of pristine TiNCl. Optical and photoemission spectroscopy revealed an in-gap state below the Fermi level, indicating hydrogen incorporation, similar to the case of β−ZrNCl. Hydrogen temperature-programmed desorption revealed hydrogen emission against the heat treatment of the obtained pristine TiNCl. The in-gap state of hydrogen inhibits the introduction of electron carriers from the intercalated Na metal.
AB - Layered titanium nitride chloride (TiNCl) exhibits a relatively high superconducting transition of ∼16 K, and it is a candidate for the unconventional superconductor. To better understand the superconductivity, we modified the synthesis process for TiNCl. Highly crystalline TiNCl was prepared by chemical vapor transport at different transport temperatures and intercalated with sodium (Na) metal. Although the crystallographic parameters obtained through Rietveld refinement are similar, the superconducting properties strongly depend on the treatment temperature of pristine TiNCl. Optical and photoemission spectroscopy revealed an in-gap state below the Fermi level, indicating hydrogen incorporation, similar to the case of β−ZrNCl. Hydrogen temperature-programmed desorption revealed hydrogen emission against the heat treatment of the obtained pristine TiNCl. The in-gap state of hydrogen inhibits the introduction of electron carriers from the intercalated Na metal.
KW - Hydrogen incorporation
KW - Nitride halides
KW - Optical spectroscopy
KW - Photoemission spectroscopy
KW - Superconductivity
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U2 - 10.1016/j.materresbull.2022.111896
DO - 10.1016/j.materresbull.2022.111896
M3 - Article
AN - SCOPUS:85131419312
SN - 0025-5408
VL - 153
JO - Materials Research Bulletin
JF - Materials Research Bulletin
M1 - 111896
ER -