Bose-Einstein condensation superconductivity induced by disappearance of the nematic state

被引：43

作者：

Hashimoto, Takahiro ^{[1
]}

Ota, Yuichi ^{[1
]}

Tsuzuki, Akihiro ^{[1
]}

Nagashima, Tsubaki ^{[1
]}

Fukushima, Akiko ^{[1
]}

Kasahara, Shigeru ^{[2
]}

Matsuda, Yuji ^{[2
]}

Matsuura, Kohei ^{[3
]}

Mizukami, Yuta ^{[3
]}

Shibauchi, Takasada ^{[3
]}

Shin, Shik ^{[4
,5
]}

Okazaki, Kozo ^{[1
,5
,6
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys ISSP, Kashiwa, Chiba 2778581, Japan

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

[3] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

[4] Off Univ Prof, Univ Tokyo, Kashiwa, Chiba 2778568, Japan

[5] Univ Tokyo, Mat Innovat Res Ctr, Kashiwa, Chiba 2778561, Japan

[6] Univ Tokyo, Trans Scale Quantum Sci Inst, Bunkyo Ku, Tokyo 1130033, Japan

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 45期

基金：

日本学术振兴会;

关键词：

CRITICAL-POINT;

D O I：

10.1126/sciadv.abb9052

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The crossover from the superconductivity of the Bardeen-Cooper-Schrieffer (BCS) regime to the Bose-Einstein condensation (BEC) regime holds a key to understanding the nature of pairing and condensation of fermions. It has been mainly studied in ultracold atoms, but in solid systems, fundamentally previously unknown insights may be obtained because multiple energy bands and coexisting electronic orders strongly affect spin and orbital degrees of freedom. Here, we provide evidence for the BCS-BEC crossover in iron-based superconductors FeSe1-xSx from laser-excited angle-resolved photoemission spectroscopy. The system enters the BEC regime with x=0.21, where the nematic state that breaks the orbital degeneracy is fully suppressed. The substitution dependence is opposite to the expectation for single-band superconductors, which calls for a new mechanism of BCS-BEC crossover in this system.

引用

页数：6

共 26 条

[1] Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
Boehmer, A. E.
Hardy, F.
Eilers, F.
Ernst, D.
Adelmann, P.
Schweiss, P.
Wolf, T.
Meingast, C.
[J]. PHYSICAL REVIEW B, 2013, 87 (18)
[2] Superconductivity versus bound-state formation in a two-band superconductor with small Fermi energy: Applications to Fe pnictides/chalcogenides and doped SrTiO3
Chubukov, Andrey V.
Eremin, Ilya
Efremov, Dmitri V.
[J]. PHYSICAL REVIEW B, 2016, 93 (17)
[3] Observation of pseudogap behaviour in a strongly interacting Fermi gas
Gaebler, J. P.
Stewart, J. T.
Drake, T. E.
Jin, D. S.
Perali, A.
Pieri, P.
Strinati, G. C.
[J]. NATURE PHYSICS, 2010, 6 (08) : 569 - 573
[4] Quantum Vortex Core and Missing Pseudogap in the Multiband BCS-BEC Crossover Superconductor FeSe
Hanaguri, T.
Kasahara, S.
Boeker, J.
Eremin, I.
Shibauchi, T.
Matsuda, Y.
[J]. PHYSICAL REVIEW LETTERS, 2019, 122 (07)
[5] Two distinct superconducting pairing states divided by the nematic end point in FeSe1-xSx
Hanaguri, Tetsuo
Iwaya, Katsuya
Kohsaka, Yuhki
Machida, Tadashi
Watashige, Tatsuya
Kasahara, Shigeru
Shibauchi, Takasada
Matsuda, Yuji
[J]. SCIENCE ADVANCES, 2018, 4 (05):
[6] Superconducting gap anisotropy sensitive to nematic domains in FeSe
Hashimoto, Takahiro
Ota, Yuichi
Yamamoto, Haruyoshi Q.
Suzuki, Yuya
Shimojima, Takahiro
Watanabe, Shuntaro
Chen, Chuangtian
Kasahara, Shigeru
Matsuda, Yuji
Shibauchi, Takasada
Okazaki, Kozo
Shin, Shik
[J]. NATURE COMMUNICATIONS, 2018, 9
[7] Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
Hosoi, Suguru
Matsuura, Kohei
Ishida, Kousuke
Wang, Hao
Mizukami, Yuta
Watashige, Tatsuya
Kasahara, Shigeru
Matsuda, Yuji
Shibauchi, Takasada
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2016, 113 (29) : 8139 - 8143
[8] Superconductivity in the PbO-type structure α-FeSe
Hsu, Fong-Chi
Luo, Jiu-Yong
Yeh, Kuo-Wei
Chen, Ta-Kun
Huang, Tzu-Wen
Wu, Phillip M.
Lee, Yong-Chi
Huang, Yi-Lin
Chu, Yan-Yi
Yan, Der-Chung
Wu, Maw-Kuen
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2008, 105 (38) : 14262 - 14264
[9] Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS-BEC crossover
Kasahara, S.
Yamashita, T.
Shi, A.
Kobayashi, R.
Shimoyama, Y.
Watashige, T.
Ishida, K.
Terashima, T.
Wolf, T.
Hardy, F.
Meingast, C.
Von Loehneysen, H.
Levchenko, A.
Shibauchi, T.
Matsuda, Y.
[J]. NATURE COMMUNICATIONS, 2016, 7
[10] Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
Kasahara, Shigeru
Watashige, Tatsuya
Hanaguri, Tetsuo
Kohsaka, Yuhki
Yamashita, Takuya
Shimoyama, Yusuke
Mizukami, Yuta
Endo, Ryota
Ikeda, Hiroaki
Aoyama, Kazushi
Terashima, Taichi
Uji, Shinya
Wolf, Thomas
von Loehneysen, Hilbert
Shibauchi, Takasada
Matsuda, Yuji
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2014, 111 (46) : 16309 - 16313

← 1 2 3 →