Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained $BaF{e}_{2}A{s}_2$

Abstract

The in-plane resistivity and uniform magnetic susceptibility anisotropies of $BaF{e}_{2}A{s}_2$ are obtained with a new method, in which a large symmetry-breaking uniaxial strain is applied using a substrate with a very anisotropic thermal expansion. The resistivity anisotropy and its corresponding elastoresistivity exhibit very similar diverging behavior as those obtained from piezo-stack experiments. This suggests that the resistivity anisotropy is more a direct measure of magnetism than of nematicity, since the nematic transition is no longer well-defined under a large strain. In strong contrast to the large resistivity anisotropy above $T_N$, the anisotropy of the in-plane magnetic susceptibility develops largely below $T_N$. Using an itinerant model, we show that the observed anisotropy (${\chi }_b>{\chi }_a$) is determined by spin-orbit coupling and the orientation of the magnetic moments in the antiferromagnetic phase, and that the anisotropy is dominated by intra-orbital ($yz,yz$) contributions of the Umklapp susceptibility.

6 pages and supplemental material

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• Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe${}_2$As${}_2$
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Evidence for short-range magnetic order in the nematic phase of FeSe from anisotropic in-plane magnetostriction and susceptibility measurements
• An Electronic Nematic Liquid in BaNi${}_2$As${}_2$
• Elastoresistivity in the incommensurate charge density wave phase of BaNi${}_{\text{2}}$(As${}_{\text{1-x}}$P${}_{\text{x}}$)${}_{\text{2}}$
• Effect of biaxial strain on the phase transitions of Ca(Fe1-xCox)2As2
• Spin-Orbital-Intertwined Nematic State in FeSe
• Rigid platform for applying large tunable strains to mechanically delicate samples
• Singular magnetic anisotropy in the nematic phase of FeSe
• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Local nematic susceptibility in stressed BaFe${}_2$As${}_2$ from NMR electric field gradient measurements
• Dominant in-plane symmetric elastoresistance in CsFe2As2
• Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe2As2
• Electronic nematicity in URu2Si2 revisited
• Anisotropic optical properties of detwinned BaFe${}_2$As${}_2$
• In-plane electronic anisotropy revealed by interlayer resistivity measurements on the iron-based superconductor parent compound CaFeAsF
• Measurements of nematic susceptibility with phase sensitive nuclear magnetic resonance in pulsed strain fields
• Increase of critical current density in FeSe superconductor by strain effect
• Apparatus Design for Measuring of the Strain Dependence of the Seebeck Coefficient of Single Crystals
• In-plane anisotropic magnetoresistance in detwinned $BaF{e}_{2-x}N{i}_{x}A{s}_2$ ($x$ = 0, 0.6)
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe