Pressure-temperature phase diagram of the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuRbFe</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
 superconductor

Li, Xiang; Bud’ko, Sergey L.; Bao, Jianguo; Chung, Duck Young; Kanatzidis, Mercouri G.; Canfield, Paul C.

doi:10.1103/physrevb.99.144509

Cited by 14 publications

(13 citation statements)

References 43 publications

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“…Only for the special cases of Eu-containing 1144 compounds, such as CsEuFe 4 As 4 and RbEuFe 4 As 4 , the ferromagnetism, which is associated with the Eu 2+ moments, survives the hcT transitions, as consistently found in calculations [22] and experiments. [224,225] The robustness of these ideas concerning the relation of the half-collapsed tetragonal transition and superconductivity can be seen, for example, when considering the temperature-pressure phase diagram of electron-doped CaKFe 4 As 4 . At ambient pressure, the magnetic ground state, which was observed in the series of CaK(Fe 1−x Ni x ) 4 As 4 and CaK(Fe 1−x Co x ) 4 As 4 , has created enormous interest, since it was shown that the magnetic order is of a new type, the so-called hedgehog spin-vortex order, [60] which is likely stabilized by the reduced symmetry of the 1144 crystal structure.…”

Section: Effect Of Pressure On Cak(fe 1−x Ni X ) 4 As 4 : Occurrence mentioning

confidence: 99%

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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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Section: Effect Of Pressure On Cak(fe 1−x Ni X ) 4 As 4 : Occurrence mentioning

confidence: 99%

“…Only for the special cases of Eu‐containing 1144 compounds, such as CsEuFe 4 As 4 and RbEuFe 4 As 4 , the ferromagnetism, which is associated with the Eu 2 + moments, survives the hcT transitions, as consistently found in calculations [ 22 ] and experiments. [ 224,225 ]…”

Section: Tuning Of the Collapsed‐tetragonal Transition By Hydrostaticmentioning

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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“…39 On the other hand, EuRbFe 4 As 4 undergoes a superconducting transition above the magnetic one (T c > T m ). These findings motivated intensive theoretical [40][41][42][43][44] and experimental 39,[45][46][47][48][49][50][51][52][53][54][55][56][57][58] works in order to understand the interplay between these two antagonistic phenomena.…”

Section: Introductionmentioning

confidence: 97%

Topological magnetic order and superconductivity in EuRbFe$_4$As$_4$

Hemmida,

Winterhalter-Stocker,

Ehlers

et al. 2020

Preprint

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We study single crystals of the magnetic superconductor EuRbFe4As4 by magnetization, electron spin resonance (ESR), angle-resolved photoemission spectroscopy (ARPES) and electrical resistance in pulsed magnetic fields up to 630 kOe. The superconducting state below 36.5 K is almost isotropic and only weakly affected by the development of Eu 2+ magnetic order at 15 K. On the other hand, for the external magnetic field applied along the c-axis the temperature dependence of the ESR linewidth reveals a Berezinskii-Kosterlitz-Thouless topological transition below 15 K. This indicates that Eu 2+ -planes are a good realization of a two-dimensional XY-magnet, which reflects the decoupling of the Eu 2+ magnetic moments from superconducting FeAs-layers.

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“…These materials are characterized by highly-anisotropic easy-axis Eu magnetism [41,44,45]. With increasing pressure the superconducting transition temperature decreases and the magnetic transition temperature increases so that at pressures larger that ∼ 7 GPa superconducting transition already takes place in the magnetically-ordered state [46,47]. Recent resonant X-ray scattering and neutron diffraction measurements demonstrated that the magnetic structure is helical: the Eu moments align ferromagnetically inside the layers and rotate 90 • from layer to layer [48,49].…”

Section: Introductionmentioning

confidence: 99%

Spin waves and high-frequency response in layered superconductors with helical magnetic structure

Koshelev

2021

Preprint

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We evaluate the spin-wave spectrum and dynamic susceptibility in a layered superconductors with helical interlayer magnetic structure. We especially focus on the structure in which the moments rotate 90 • from layer to layer realized in the iron pnictide RbEuFe4As4. The spin-wave spectrum in superconductors is strongly renormalized due to the long-range electromagnetic interactions between the oscillating magnetic moments. This leads to strong enhancement of the frequency of the mode coupled with uniform field and this enhancement exists only within a narrow range of the c-axis wave vectors of the order of the inverse London penetration depth. The key feature of materials like RbEuFe4As4 is that this uniform mode corresponds to the maximum frequency of the spinwave spectrum with respect to c-axis wave vector. As a consequence, the high-frequency surface resistance acquires a very distinct asymmetric feature spreading between the bare and renormalized frequencies. We also consider excitation of spin waves with Josephson effect in a tunneling contact between helical-magnetic and conventional superconductors and study the interplay between the spin-wave features and geometrical cavity resonances in the current-voltage characteristics.

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Pressure-temperature phase diagram of the EuRbFe4As4 superconductor

Cited by 14 publications

References 43 publications

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

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

Topological magnetic order and superconductivity in EuRbFe$_4$As$_4$

Spin waves and high-frequency response in layered superconductors with helical magnetic structure

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