Evolution of superconductivity in K2-xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission

被引：4

作者：

Wang, H. T. ^{[1
]}

Ghosh, Anirudha ^{[2
]}

Wang, C. H. ^{[3
,4
]}

Hsieh, S. H. ^{[2
,5
]}

Shao, Y. C. ^{[2
,6
]}

Chiou, J. W. ^{[7
]}

Chen, C. L. ^{[5
]}

Pao, C. W. ^{[5
]}

Lee, J. F. ^{[5
]}

Liu, Y. S. ^{[6
]}

Chuang, Y. D. ^{[6
]}

Guo, J. H. ^{[6
]}

Wu, M. K. ^{[1
,3
]}

Pong, W. F. ^{[2
]}

机构：

[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[2] Tamkang Univ, Dept Phys, Tamsui 25137, Taiwan

[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[4] Natl Univ Sci & Technol, Dept Elect & Comp Engn, Taipei 10607, Taiwan

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 81148, Taiwan

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2019年 / 116卷 / 45期

关键词：

superconductivity; Fe vacancy disorder; X-ray absorption spectroscopy; resonant inelastic X-ray scattering;

D O I：

10.1073/pnas.1912610116

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：

This study investigates the evolution of superconductivity in K2-xFe4+ySe5 using temperature-dependent X-ray absorption and resonant inelastic X-ray scattering techniques. Magnetization measurements show that polycrystalline superconducting (SC) K1.9Fe4.2Se5 has a critical temperature (T-c) of similar to 31 K with a varying superconducting volume fraction, which strongly depends on its synthesis temperature. An increase in Fe-structural/vacancy disorder in SC samples with more Fe atoms occupying vacant 4d sites is found to be closely related to the decrease in the spin magnetic moment of Fe. Moreover, the nearest-neighbor Fe-Se bond length in SC samples exceeds that in the non-SC (NS) sample, K2Fe4Se5, which indicates a weaker hybridization between the Fe 3d and Se 4p states in SC samples. These results clearly demonstrate the correlations among the local electronic and atomic structures and the magnetic properties of K2-xFe4+ySe5 superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.

引用

页码：22458 / 22463

页数：6

共 50 条

[1] Role of the extra Fe in K2-xFe4+ySe5 superconductors
Wang, Chih-Han
Lee, Chih-Chien
Huang, Gwo-Tzong
Yang, Jie-Yu
Wang, Ming-Jye
Sheu, Hwo-Shuenn
Lee, Jey-Jau
Wu, Maw-Kuen
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (04) : 1104 - 1109
[2] X-ray absorption and emission spectroscopic studies of BiMn2-xTixO5 (0 ≤ x ≤ 0.5)
Thakur, P.
Chae, K. H.
Whang, C. N.
Chang, G. S.
Shukla, D. K.
Mollah, S.
Kumar, Ravi
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2008, 53 (03) : 1449 - 1455
[3] Electronic Structure Studies of Nanoferrite CuxCo1-xFe2O4 by X-ray Absorption Spectroscopy
Gautam, S.
Muthurani, S.
Balaji, M.
Thakur, P.
Padiyan, D. Pathinettam
Chae, K. H.
Kim, S. S.
Asokan, K.
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 2011, 11 (01) : 386 - 390
[4] In situ combined X-ray absorption spectroscopic and X-ray diffractometric studies of solid catalysts
Sankar, G
Thomas, JM
TOPICS IN CATALYSIS, 1999, 8 (1-2) : 1 - 21
[5] X-ray absorption spectroscopic analysis of CuIr2S4
Kijima, N.
Yashiro, H.
Awaka, J.
Akimoto, J.
Nagata, S.
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 480 (01) : 120 - 122
[6] X-ray absorption and photoemission spectroscopy of electronic phase separation in KxFe2-ySe2
Saini, N. L.
Mizokawa, T.
Magnano, E.
Nappini, S.
Bondino, F.
Takeya, H.
Mizuguchi, Y.
Takano, Y.
Garg, K. B.
PHYSICAL REVIEW B, 2014, 90 (18)
[7] Polarization-dependent Ti K X-ray absorption and emission studies of Ti2O3 single crystal
Sato, H.
Maso, H.
Utsumi, Y.
Kurihara, H.
Mukaegawa, Y.
Tezuka, Y.
Iwazumi, T.
Iga, F.
Tsubota, M.
Namatame, H.
Taniguchi, M.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 2011, 184 (3-6) : 184 - 187
[8] X-ray absorption spectroscopic study of a hot pressed MgB2
Hsieh, CH
Chang, CH
Chang, CN
Sou, UC
Sheu, HS
Hsu, HC
Yang, HC
SOLID STATE COMMUNICATIONS, 2006, 137 (1-2) : 97 - 100
[9] Ligand K-edge X-ray absorption spectroscopic studies: metal-ligand covalency in transition metal tetrathiolates
Williams, KR
Hedman, B
Hodgson, KO
Solomon, EI
INORGANICA CHIMICA ACTA, 1997, 263 (1-2) : 315 - 321
[10] Infrared and X-ray absorption spectroscopic studies on the mechanism of chromium(III) binding to alfalfa biomass
Gardea-Torresdey, JL
Dokken, K
Tiemann, KJ
Parsons, JG
Ramos, J
Pingitore, NE
Gamez, G
MICROCHEMICAL JOURNAL, 2002, 71 (2-3) : 157 - 166

← 1 2 3 4 5 →