Effect of pressure on the Cu and Pr magnetism in Nd<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Pr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></

Maisuradze, A.; Graneli, B.; Guguchia, Zurab; Shengelaya, А.; Pomjakushina, E.; Conder, K.; Keller, H.

doi:10.1103/physrevb.87.054401

Cited by 7 publications

(13 citation statements)

References 54 publications

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“…Pressures up to 2.4 GPa were generated in a double-wall piston-cylinder type of cell made of MP35N material, especially designed to perform μSR experiments under pressure5152. As a pressure-transmitting medium Daphne oil was used.…”

Section: Methodsmentioning

confidence: 99%

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor

et al. 2015

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The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. In contrast to other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central interest. Here we report high-pressure muon spin rotation experiments on the temperature-dependent magnetic penetration depth in the optimally doped nodeless s-wave Fe-HTS Ba0.65Rb0.35Fe2As2. Upon pressure, a strong decrease of the penetration depth in the zero-temperature limit is observed, while the superconducting transition temperature remains nearly constant. More importantly, the low-temperature behaviour of the inverse-squared magnetic penetration depth, which is a direct measure of the superfluid density, changes qualitatively from an exponential saturation at zero pressure to a linear-in-temperature behaviour at higher pressures, indicating that hydrostatic pressure promotes the appearance of nodes in the superconducting gap.

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Section: Methodsmentioning

confidence: 99%

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor

et al. 2015

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“…µSR experiments under various applied pressures were performed at the µE1 beamline of PSI, using the dedicated GPD spectrometer. Pressures up to 2.3 GPa were generated in a double wall piston-cylinder type of cell made out of MP35N material, especially designed to perform µSR experiments under pressure 50 . As a pressure transmitting medium Daphne oil was used.…”

Section: Methodsmentioning

confidence: 99%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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Probing the pairing symmetry in the over-doped Fe- We report muon spin rotation experiments on the magnetic penetration depth λ and the temperature dependence of λ −2 in the over-doped Fe-based high-temperature superconductor (Fe-HTS) Ba1−xRbxFe2As2 (x = 0.65) studied at ambient and under hydrostatic pressures up to p = 2.3 GPa. We find that in this system λ −2 (T ) is best described by d-wave scenario. This is in contrast to the case of the optimally doped x = 0.35 system which is known to be a nodeless s +− -wave superconductor. This suggests that the doping induces the change of the pairing symmetry from s +− to d-wave in Ba1−xRbxFe2As2. In addition, we find that the d-wave order parameter is robust against pressure, suggesting that d is the common and dominant pairing symmetry in over-doped Ba1−xRbxFe2As2. Application of pressure of p = 2.3 GPa causes a decrease of λ(0) by less than 5 %, while at optimal doping x = 0.35 a significant decrease of λ(0) was reported. The superconducting transition temperature Tc as well as the gap to Tc ratio 2∆/kBTc show only a modest decrease with pressure. By combining the present data with those previously obtained for optimally doped system x = 0.35 and for the end member x = 1 we conclude that the SC gap symmetry as well as the pressure effects on the SC quantities strongly depend on the Rb doping level. These results are discussed in the light of the putative Lifshitz transition, i.e., a disappearance of the electron pockets in the Fermi surface of Ba1−xRbxFe2As2 upon hole doping.

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“…where A S and A P C are the initial asymmetries and P S (t) and P P C (t) are the muon-spin polarizations belonging to the sample and the pressure cell, respectively. The pressure cell signal was modeled with a damped Kubo-Toyabe function [27]. The response of the sample consists [12,13]).…”

Section: Methodsmentioning

confidence: 99%

Probing the quantum phase transition in Mott insulator BaCoS2 tuned by pressure and Ni substitution

Guguchia

Frandsen

Santos-Cottin

et al. 2019

Phys. Rev. Materials

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We present a muon spin relaxation study of the Mott transition in BaCoS2 using two independent control parameters: (i) pressure p to tune the electronic bandwidth and (ii) Ni-substitution x on the Co site to tune the band filling. For both tuning parameters, the antiferromagnetic insulating state first transitions to an antiferromagnetic metal and finally to a paramagnetic metal without undergoing any structural phase transition. BaCoS2 under pressure displays minimal change in the ordered magnetic moment S ord until it collapses abruptly upon entering the antiferromagnetic metallic state at pcr ∼1.3 GPa. In contrast, S ord in the Ni-doped system Ba(Co1−xNix)S2 steadily decreases with increasing x until the antiferromagnetic metallic region is reached at xcr ∼ 0.22. In both cases, significant phase separation between magnetic and nonmagnetic regions develops when approaching pcr or xcr, and the antiferromagnetic metallic state is characterized by weak, random, static magnetism in a small volume fraction. No dynamical critical behavior is observed near the transition for either tuning parameter. These results demonstrate that the quantum evolution of both the bandwidth-and filling-controlled metal-insulator transition at zero temperature proceeds as a first-order transition. This behavior is common to magnetic Mott transitions in RENiO3 and V2O3, which are accompanied by structural transitions without the formation of an antiferromagnetic metal phase.PACS numbers:

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Effect of pressure on the Cu and Pr magnetism in Nd1−xPrxBa2

Cited by 7 publications

References 54 publications

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

Probing the quantum phase transition in Mott insulator BaCoS2 tuned by pressure and Ni substitution

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