Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: Angle-resolved photoemission study

被引：5

作者：

Chuang, Chien-Wen ^{[1
]}

Souma, Seigo ^{[2
,3
]}

Moriya, Ayumi ^{[1
]}

Nakayama, Kosuke ^{[1
,4
]}

Ikeda, Atsutoshi ^{[5
,6
]}

Kawaguchi, Mayo ^{[7
]}

Obata, Keito ^{[7
]}

Saha, Shanta Ranjan ^{[5
,6
]}

Takahashi, Hidemitsu ^{[7
]}

Kitagawa, Shunsaku ^{[7
]}

Ishida, Kenji ^{[7
]}

Tanaka, Kiyohisa ^{[8
,9
]}

Kitamura, Miho ^{[10
]}

Horiba, Koji ^{[10
,11
]}

Kumigashira, Hiroshi ^{[12
]}

Takahashi, Takashi ^{[1
]}

Yonezawa, Shingo ^{[7
]}

Paglione, Johnpierre ^{[5
,6
]}

Maeno, Yoshiteru ^{[7
]}

Sato, Takafumi ^{[1
,2
,3
,13
]}

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Tohoku Univ, Ctr Sci & Innovat Spintron CSIS, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai, Miyagi 9808577, Japan

[4] Japan Sci & Technol Agcy JST, Precursory Res Embryon Sci & Technol PRESTO, Tokyo 1020076, Japan

[5] Univ Maryland, Maryland Quantum Mat Ctr, College Pk, MD 20742 USA

[6] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[7] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[8] Inst Mol Sci, UVSOR Synchrotron Facil, Okazaki, Aichi 4448585, Japan

[9] Grad Univ Adv Studies SOKENDAI, Sch Phys Sci, Okazaki, Aichi 4448585, Japan

[10] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[11] Natl Inst Quantum Sci & Technol QST, Sendai, Miyagi 9808579, Japan

[12] Tohoku Univ, Inst Multidisciplinary Res Adv Mat IMRAM, Sendai, Miyagi 9808577, Japan

[13] Tohoku Univ, Int Ctr Synchrotron Radiat Innovat Smart SRIS, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW MATERIALS | 2022年 / 6卷 / 10期

关键词：

SEMIMETAL; DISCOVERY;

D O I：

10.1103/PhysRevMaterials.6.104203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We performed angle-resolved photoemission spectroscopy with microfocused beam on a topological linenodal compound CaSb2 which undergoes a superconducting transition at the onset T-c similar to 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 Gamma 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 T-c'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.

引用

页数：6

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