Microstructural magnetic phases in superconducting FeTe0.65Se0.35

被引：42

作者：

Wittlin, A. ^{[1
]}

Aleshkevych, P. ^{[1
]}

Przybylinska, H. ^{[1
]}

Gawryluk, D. J. ^{[1
]}

Dluzewski, P. ^{[1
]}

Berkowski, M. ^{[1
]}

Puzniak, R. ^{[1
]}

Gutowska, M. U. ^{[1
]}

Wisniewski, A. ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2012年 / 25卷 / 06期

基金：

欧洲研究理事会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; TRANSITION; DIAGRAM; FE7SE8;

D O I：

10.1088/0953-2048/25/6/065019

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper, we address a number of outstanding issues concerning the nature and the role of magnetic inhomogeneities in the iron chalcogenide system FeTe1-xSex and their correlation with superconductivity in this system. We report morphology of superconducting single crystals of FeTe0.65Se0.35 studied with transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy and their magnetic and superconducting properties characterized with magnetization, specific heat and magnetic resonance spectroscopy. Our data demonstrate the presence of nanoscale hexagonal regions coexisting with a tetragonal host lattice, a chemical disorder demonstrating a nonhomogeneous distribution of host atoms in the crystal lattice, as well as iron-deficient bands hundreds of nanometres in length. From the magnetic data and ferromagnetic resonance temperature dependence, we attribute magnetic phases in Fe-Te-Se to Fe3O4 inclusions and to hexagonal symmetry nanoscale regions with a structure of the Fe7Se8 type. Our results suggest that a nonhomogeneous distribution of host atoms might be an intrinsic feature of superconducting Fe-Te-Se chalcogenides and we find a surprising correlation indicating that a faster grown crystal of inferior crystallographic properties is a better superconductor.

引用

页数：9

共 52 条

[1] On the multi-orbital band structure and itinerant magnetism of iron-based superconductors [J].

Andersen, Ole Krogh ;

Boeri, Lilia .

ANNALEN DER PHYSIK, 2011, 523 (1-2) :8-50

[2] A NEUTRON DIFFRACTION STUDY OF FE7SE8 [J].

ANDRESEN, AF ;

LECIEJEWICZ, J .

JOURNAL DE PHYSIQUE, 1964, 25 (05) :574-578

[3]

[Anonymous], 1965, PHYS PRINCIPLES MAGN

[4] Coexistence of localized and itinerant electronic states in the multiband iron-based superconductor FeSe0.42Te0.58 [J].

Arcon, D. ;

Jeglic, P. ;

Zorko, A. ;

Potocnik, A. ;

Ganin, A. Y. ;

Takabayashi, Y. ;

Rosseinsky, M. J. ;

Prassides, K. .

PHYSICAL REVIEW B, 2010, 82 (14)

[5] Tunable (δπ, δπ)-Type Antiferromagnetic Order in α-Fe(Te,Se) Superconductors [J].

Bao, Wei ;

Qiu, Y. ;

Huang, Q. ;

Green, M. A. ;

Zajdel, P. ;

Fitzsimmons, M. R. ;

Zhernenkov, M. ;

Chang, S. ;

Fang, Minghu ;

Qian, B. ;

Vehstedt, E. K. ;

Yang, Jinhu ;

Pham, H. M. ;

Spinu, L. ;

Mao, Z. Q. .

PHYSICAL REVIEW LETTERS, 2009, 102 (24)

[6] Tuning the superconducting and magnetic properties of FeySe0.25Te0.75 by varying the iron content [J].

Bendele, M. ;

Babkevich, P. ;

Katrych, S. ;

Gvasaliya, S. N. ;

Pomjakushina, E. ;

Conder, K. ;

Roessli, B. ;

Boothroyd, A. T. ;

Khasanov, R. ;

Keller, H. .

PHYSICAL REVIEW B, 2010, 82 (21)

[7] Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5 [J].

Bendele, M. ;

Weyeneth, S. ;

Puzniak, R. ;

Maisuradze, A. ;

Pomjakushina, E. ;

Conder, K. ;

Pomjakushin, V. ;

Luetkens, H. ;

Katrych, S. ;

Wisniewski, A. ;

Khasanov, R. ;

Keller, H. .

PHYSICAL REVIEW B, 2010, 81 (22)

[8] Lineshapes in magnetic resonance spectra [J].

Berger, R ;

Bissey, JC ;

Kliava, J .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2000, 12 (44) :9347-9360

[9] Phase separation and superconductivity in Fe1+xTe0.5Se0.5 [J].

Bhatia, Vikas ;

Rodriguez, Efrain E. ;

Butch, Nicholas P. ;

Paglione, Johnpierre ;

Green, Mark A. .

CHEMICAL COMMUNICATIONS, 2011, 47 (40) :11297-11299

[10] Stripe structure in the CuO2 plane of perovskite superconductors [J].

Bianconi, A ;

Saini, NL ;

Rossetti, T ;

Lanzara, A ;

Perali, A ;

Missori, M ;

Oyanagi, H ;

Yamaguchi, H ;

Nishihara, Y ;

Ha, DH .

PHYSICAL REVIEW B, 1996, 54 (17) :12018-12021

← 1 2 3 4 5 6 →