Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems

Abstract

The angular-dependent magnetoresistance (AMR) of the ab plane is measured on the single crystals of FeSe1-xSx (x = 0, 0.07, 0.13 and 1) and FeSe1-yTey (y = 0.06, 0.61 and 1) at various temperatures under fields up to 9 T. A pronounced twofold-anisotropic carrier-scattering effect is identified by AMR, and attributed to a magnetic-field-induced spin nematicity that emerges from the tetragonal normal-state regime below a characteristic temperature Tsn. This magnetically polarized spin nematicity is found to be ubiquitous in the isoelectronic FeSe1-xSx and FeSe1-yTey systems, no matter whether the sample shows an electronic nematic order at Ts < Tsn, or an antiferromagnetic order at TN < Tsn, or neither order. Importantly, we find that the isoelectronic substitution with sulfur does not suppress but even enhances the characteristic Tsn of the induced spin nematicity in FeSe1-xSx samples. This contrasts sharply with their rapidly suppressed Ts, the transition temperature of the spontaneous electronic nematicity. Furthermore, we find that the superconductivity is significantly suppressed with the enhancement of the induced spin nematicity in both FeSe1-xSx and FeSe1-yTey samples.

13 pages, 5 figures, plus supplemental material

References in corpus (21)

• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Theory of Electron Nematic Order in LaOFeAs
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Nematic and meta-nematic transitions in the iron pnictides
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• The key ingredients of the electronic structure of FeSe
• Transport and anisotropy in single-crystalline SrFe${}_2$As${}_2$ and $A_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ ($A$ = Sr, Ba) superconductors
• Strong $(\pi ,0)$ spin fluctuations in $\beta$-FeSe observed by neutron spectroscopy
• Anisotropic spin fluctuations in detwinned FeSe
• Antiferromagnetic ground state with pair-checkboard order in FeSe
• Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors
• Low-energy spin excitations in Li(0.8)Fe(0.2)ODFeSe superconductor studied with inelastic neutron scattering
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Spin excitations and the Fermi surface of superconducting FeS
• Emergence of superconductivity in strongly correlated hole-dominated Fe1-xSe
• Unusual normal and superconducting state properties observed in hydrothermal Fe1-xSe flakes
• Electronic phase diagram of iron chalcogenide superconductors FeSe1-xSx and FeSe1-yTey

Cited by in corpus (2)

• FeSe and the missing electron pocket problem
• Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors