TY - JOUR
T1 - Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity
T2 - Angle-resolved photoemission study
AU - Chuang, Chien Wen
AU - Souma, Seigo
AU - Moriya, Ayumi
AU - Nakayama, Kosuke
AU - Ikeda, Atsutoshi
AU - Kawaguchi, Mayo
AU - Obata, Keito
AU - Saha, Shanta Ranjan
AU - Takahashi, Hidemitsu
AU - Kitagawa, Shunsaku
AU - Ishida, Kenji
AU - Tanaka, Kiyohisa
AU - Kitamura, Miho
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Takahashi, Takashi
AU - Yonezawa, Shingo
AU - Paglione, Johnpierre
AU - Maeno, Yoshiteru
AU - Sato, Takafumi
N1 - Funding Information:
We thank M. Tomikawa for his assistance in the sample characterization. This work was supported by JST-CREST (No: JPMJCR18T1), JST-PRESTO (No: JPMJPR18L7), Grant-in-Aid for Scientific Research (JSPS KAKENHI Grants No. JP21H04435, No. JP20H01847, No. JP20H00130, No. JP20KK0061, No. JP21K18600, and No. JP22H04933), the U.S. Department of Energy Award for low temperature sample characterization (No. DE-SC0019154), the Gordonand Betty Moore Foundation's EPiQS Initiative for sample synthesis (No. GBMF9071), the Maryland Quantum Materials Center, KEK-PF (Proposal No. 2021S2-001), and UVSOR (Proposal No. 21-658 and No. 21-679). C.-W. C. acknowledges support from GP-Spin and JSPS.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/10
Y1 - 2022/10
N2 - We performed angle-resolved photoemission spectroscopy with microfocused beam on a topological line-nodal compound CaSb2 which undergoes a superconducting transition at the onset Tc∼ 1.8 K, to clarify the Fermi-surface topology relevant to the occurrence of superconductivity. We found that a three-dimensional hole pocket at the Γ point is commonly seen for two types of single-crystalline samples fabricated by different growth conditions. On the other hand, the carrier-doping level estimated from the position of the chemical potential was found to be sensitive to the sample fabrication condition. The cylindrical electron pocket at the Y(C) point predicted by the calculations is absent in one of the two samples, despite the fact that both samples commonly show superconductivity with similar Tc's. This suggests a key role of the three-dimensional hole pocket to the occurrence of superconductivity, and further points to an intriguing possibility to control the topological nature of superconductivity by carrier tuning in CaSb2.
AB - We performed angle-resolved photoemission spectroscopy with microfocused beam on a topological line-nodal compound CaSb2 which undergoes a superconducting transition at the onset Tc∼ 1.8 K, to clarify the Fermi-surface topology relevant to the occurrence of superconductivity. We found that a three-dimensional hole pocket at the Γ point is commonly seen for two types of single-crystalline samples fabricated by different growth conditions. On the other hand, the carrier-doping level estimated from the position of the chemical potential was found to be sensitive to the sample fabrication condition. The cylindrical electron pocket at the Y(C) point predicted by the calculations is absent in one of the two samples, despite the fact that both samples commonly show superconductivity with similar Tc's. This suggests a key role of the three-dimensional hole pocket to the occurrence of superconductivity, and further points to an intriguing possibility to control the topological nature of superconductivity by carrier tuning in CaSb2.
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U2 - 10.1103/PhysRevMaterials.6.104203
DO - 10.1103/PhysRevMaterials.6.104203
M3 - Article
AN - SCOPUS:85141649808
SN - 2475-9953
VL - 6
JO - Physical Review Materials
JF - Physical Review Materials
IS - 10
M1 - 104203
ER -