Suppression of superconductivity by anisotropic strain near a nematic quantum critical point

Malinowski, Paul; Jiang, Qianni; Sanchez, Joshua J.; Mutch, Joshua; Liu, Zhaoyu; Went, Preston; Liu, Jian; Ryan, Philip; Kim, Jong Woo; Chu, Jiun‐Haw

doi:10.1038/s41567-020-0983-9

Cited by 60 publications

(55 citation statements)

References 36 publications

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“…The two most striking findings we report here are: (a) the Grüneisen parameter in SrTiO3 reaches gigantic values on the order of several thousands, larger than previously reported in many conventional and unconventional materials [29][30][31][32][33][34][35], and (b) these values agree with our theoretical calculations within the inspected strain ranges. These findings provide a clear, consistent evidence that the response of the superconducting phase to strain is predominantly due to the soft, so-called transverse optic (TO), ferroelectric phonon mode with displacements along the tensile strained c-axis direction.…”

supporting

confidence: 87%

Giant Grüneisen parameter in a superconducting quantum paraelectric

Franklin

Davino

et al. 2021

Phys. Rev. B

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Superconductivity and ferroelectricity are typically thought of as incompatible because the former needs free carriers, but the latter is usually suppressed by free carriers. This is unless the carrier concentration is sufficiently low to allow for polar distortions and mobile electrons to cooperate. In the case of strontium titanate with low carrier concentration, superconductivity and ferroelectricity have been shown to be correlated via various tuning methods, such as strain. Here, we report theoretically and experimentally evaluated Grüneisen parameters whose divergent giant values under tensile stress indicate that the dominant phonon mode which enhances the superconducting order is the ferroelectric transverse soft phonon mode. This finding puts strong constraints on other phonon modes as the main contributors to the enhanced superconductivity in strained strontium titanate. The methodology shown here can be applied to strain-tune and probe properties of other materials with polar distortions including topologically non-trivial ones.

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supporting

confidence: 87%

Giant Grüneisen parameter in a superconducting quantum paraelectric

Franklin

Davino

et al. 2021

Phys. Rev. B

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“…In addition, the response of the superconducting state in Ba(Fe

_{1 - x}

Co x ) 2 As 2 to anisotropic strain was studied experimentally very recently. [ 261 ] The main finding of ref. [261] is that both compressive as well as tensile strain suppress the superconducting

T_{c}

very quickly, and can even induce a superconductor‐to‐metal quantum phase transition.…”

Section: Role Of Uniaxial Pressure For Probing and Tuning Electronic mentioning

confidence: 99%

“…[ 261 ] The main finding of ref. [261] is that both compressive as well as tensile strain suppress the superconducting

T_{c}

very quickly, and can even induce a superconductor‐to‐metal quantum phase transition. These observations were assigned to the competition of superconductivity and the magnetic–nematic state, since the latter is promoted by the application of anisotropic strain.…”

Section: Role Of Uniaxial Pressure For Probing and Tuning Electronic mentioning

confidence: 99%

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to as nematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). Efforts to probe the phase diagrams of pressure-tuned iron-based superconductors are reviewed with a strong focus on recent insights into the phase diagrams of several members of this material class under hydrostatic pressure. These studies on FeSe, Ba(Fe 1−x Co x) 2 As 2 , Ca(Fe 1−x Co x) 2 As 2 , and CaK(Fe 1−x Ni x) 4 As 4 are, to a significant extent, made possible by advances of what measurements can be adapted to their use under differing pressure environments. The potential impact of these tools for the study of the wider class of strongly correlated electron systems is pointed out.

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“…In the case of iron-based superconductors (Fe SC) where a nematic phase breaking the C 4 rotational symmetry of the underlying lattice is found in close proximity of superconductivity [5], uniaxial strain acts as a conjugate field of the nematic order parameter. It is therefore a useful tool to study nematic susceptibilities like elastoresistivity [1,6,7], the change in resistivity anisotropy under uniaxial strain, but also more generally to study the interplay between nematic and superconducting orders [8]. Moreover applying an uniaxial strain whose symmetry is transverse to the one of the nematic order parameter can provide an alternative path to tune a material towards a nematic quantum critical point with enhanced quantum critical fluctuations [9,10].…”

Section: Introductionmentioning

confidence: 99%

Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe$_2$As$_2$

Philippe,

Faria,

Forget

et al. 2021

Preprint

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We report a Raman scattering study of nematic degrees of freedom in the iron-based superconductor parent compound BaFe2As2 under tunable uniaxial strain. We demonstrate that the polarization resolved arsenic (As) phonon intensity can be used to monitor the nematic order parameter as a function of both temperature and strain. At low temperature in the nematic ordered phase we use it to track the continuous and reversible orientation of nematic domains under variable strain. At higher temperature, the evolution of the As phonon intensity under strain reflects an enhanced nematic susceptibility close to the nematic transition TS. Its temperature dependence under strong strain follows qualitatively the expected behavior of an Ising order parameter under a symmetry breaking field. Our elasto-Raman study illustrates the interest of combining selective anisotropic strain with a symmetry resolved probe like Raman scattering. Elasto-Raman scattering can be applied to a wide variety of quantum materials where uniaxial strain tunes electronic orders.

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Suppression of superconductivity by anisotropic strain near a nematic quantum critical point

Cited by 60 publications

References 36 publications

Giant Grüneisen parameter in a superconducting quantum paraelectric

Giant Grüneisen parameter in a superconducting quantum paraelectric

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe$_2$As$_2$

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