The transport–structural correspondence across the nematic phase transition probed by elasto X-ray diffraction

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

doi:10.1038/s41563-021-01082-4

Cited by 23 publications

(12 citation statements)

References 49 publications

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“…Recalling that the elastoresistivity , the observed behavior necessarily reflects the temperature and doping dependence of both of these quantities, g T , x and . For underdoped compositions, it has been recently established that the resistivity anisotropy becomes increasingly sensitive to nematic order 23 and nematic fluctuations 19 as x is increased from zero towards x c , so it is certainly not unreasonable to anticipate that g T , x also varies as a function of x on the overdoped side of the phase diagram. Raman scattering measurements reveal that the dynamic nematic susceptibility grows as the composition is tuned towards x c from the overdoped side of the phase diagram 24 , so it is clear that the observed power-law divergence of the elastoresistivity cannot be solely due to doping dependence of g T , x .…”

Section: Discussionmentioning

confidence: 99%

Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

et al. 2022

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Strong electronic nematic fluctuations have been discovered near optimal doping for several families of Fe-based superconductors, motivating the search for a possible link between these fluctuations, nematic quantum criticality, and high temperature superconductivity. Here we probe a key prediction of quantum criticality, namely power-law dependence of the associated nematic susceptibility as a function of composition and temperature approaching the compositionally tuned putative quantum critical point. To probe the ‘bare’ quantum critical point requires suppression of the superconducting state, which we achieve by using large magnetic fields, up to 45 T, while performing elastoresistivity measurements to follow the nematic susceptibility. We performed these measurements for the prototypical electron-doped pnictide, Ba(Fe1−xCox)2As2, over a dense comb of dopings. We find that close to the putative quantum critical point, the elastoresistivity appears to obey power-law behavior as a function of composition over almost a decade of variation in composition. Paradoxically, however, we also find that the temperature dependence for compositions close to the critical value cannot be described by a single power law.

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Section: Discussionmentioning

confidence: 99%

Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

et al. 2022

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“…We also measured the B 2g -symmetry spontaneous orthorhombicity ɛ S , which is a proxy of the nematic order (see Materials and Methods and fig. S2) ( 31 ). Under applied tension, the magnitude of ɛ S is suppressed by up to 30%, coinciding with a dramatic decrease in the resistivity (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A piezo-actuator uniaxial stress device (Razorbill Instruments, CS-100) was used to provide in situ stress. The built-in capacitance strain gauge was used to determine the nominal strain εxxnom as in ( 31 ). Sample chamber constraints prevented the measurement of εxxnom for data presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

Strain-switchable field-induced superconductivity

Sanchez,

Fabbris,

Choi

et al. 2023

Sci. Adv.

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Field-induced superconductivity is a rare phenomenon where an applied magnetic field enhances or induces superconductivity. Here, we use applied stress as a control switch between a field-tunable superconducting state and a robust non–field-tunable state. This marks the first demonstration of a strain-tunable superconducting spin valve with infinite magnetoresistance. We combine tunable uniaxial stress and applied magnetic field on the ferromagnetic superconductor Eu(Fe 0.88 Co 0.12 ) 2 As 2 to shift the field-induced zero-resistance temperature between 4 K and a record-high value of 10 K. We use x-ray diffraction and spectroscopy measurements under stress and field to reveal that strain tuning of the nematic order and field tuning of the ferromagnetism act as independent control parameters of the superconductivity. Combining comprehensive measurements with DFT calculations, we propose that field-induced superconductivity arises from a novel mechanism, namely, the uniquely dominant effect of the Eu dipolar field when the exchange field splitting is nearly zero.

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“…It should motivate a refinement of its real space structure and spectroscopic studies under uniaxial stress. Another promising avenue is the recently developed in-situ combination of strain-dependent x-ray diffraction and electrical transport measurements 49 . Further elastoresistance studies in CDW systems, where a Curie-Weiss dependence is generally not observed 39,50 , are also highly desirable to investigate the different mechanisms at play.…”

Section: Discussionmentioning

confidence: 99%

Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2

et al. 2022

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Electronic nematicity, the breaking of the crystal lattice rotational symmetry by the electronic fluid, is a fascinating quantum state of matter. In this work, using electronic transport under strain we investigate the electronic nematicity of BaNi2(As1−xPx)2, a candidate system for charge-induced nematicity. We report a large B1g elastoresistance coefficient that is maximized at the tetragonal-to-orthorhombic transition temperature, that slightly precedes the first-order triclinic transition. An hysteretic behavior is observed in the resistance versus strain sweeps and interpreted as the pinning of orthorhombic domains. Remarkably, the elastoresistance only onsets together with a strong enhancement of the incommensurate charge density wave of the material, strongly suggesting that this electronic instability is uniaxial in nature and drive the orthorhombic transition. The absence of sizeable elastoresistance above this electronic phase clearly contrasts dynamic and static electronic nematicity. Finally, the elastoresistance temperature dependence that strongly differs from the Curie-Weiss form of iron-based superconductors reveals major differences for the respective coupling of electronic nematicity to the lattice. Our results uncover an extremely strain-sensitive platform to study electronic anisotropy induced by a charge-density-wave instability.

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The transport–structural correspondence across the nematic phase transition probed by elasto X-ray diffraction

Cited by 23 publications

References 49 publications

Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

Strain-switchable field-induced superconductivity

Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2

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