Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe<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>Co<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>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:

Ran, Sheng; Bud’ko, S.L.; Straszheim, Warren E.; Soh, Jing-Han; Kim, M. G.; Kreyßig, A.; Goldman, A. I.; Canfield, Paul C.

doi:10.1103/physrevb.85.224528

Cited by 66 publications

(160 citation statements)

References 56 publications

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“…Resistance measurements suffered from cracking of the samples on going through the structural transition for x 0.022 and had no discernible features for 0.028 x 0.059. 19 Temperature-dependent c-axis dilation data of as-grown Ca(Fe 1−x Co x ) 2 As 2 (x 0.059) are shown in Fig. 1(a).…”

Section: Methodsmentioning

confidence: 99%

“…These values as well as the temperature dependences of the lattice parameters are consistent with the single crystal x-ray diffraction data. 19 The second set of samples chosen for the c-axis thermal expansion measurements is the Ca(Fe 0.977 Co 0.023 ) 2 As 2 that is annealed for 7 days at different temperatures, from 350 • C to 960 • C and then quenched (note, that 960 • C annealing refers to as grown sample, see Refs. 18 and 19).…”

Section: Methodsmentioning

confidence: 99%

“…The characteristic temperatures of these features are consistent with the published phase diagram. 19 A change in the, otherwise smooth, temperature-dependent c-axis dilation and thermal For selected samples, with Co concentration of x = 0.027, 0.029, and 0.058, annealed at 400 • C for 7 days, anisotropic thermal expansion measurements were performed. The results are shown in Figs.…”

Section: Methodsmentioning

confidence: 99%

“…23 In this work, we report thermal expansion measurements on a number of Ca(Fe 1−x Co x ) 2 As 2 samples that cover all salient parts of the three-dimensional T − x − T anneal/quench phase diagram from Ref. 19 with different low temperature states. Generally speaking, thermal expansion measurements in this system reveal the evolution of the phase transitions with doping and thermal treatment and allow for the evaluation of (inferred through the Ehrenfest and Clausius-Clapeyron relations for the second-and first-order phase transitions, respectively) anisotropic, uniaxial pressure derivatives of different phase transitions observed in this system.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20] It was suggested that the annealing and quenching process, via the precipitates, controls the amount of strain built up in the samples and this way acts similarly to a moderate applied external pressure. It was shown 19 that by careful choice of Co concentration and annealing and quenching parameters, the Ca(Fe 1−x Co x ) 2 As 2 system can by systematically and reproducibly tuned to have one of four different ground states: orthorhombic and antiferromagnetic, tetragonal and superconducting, tetragonal and nonsuperconducting, and collapsed tetragonal without magnetic order or superconductivity. The equivalence between annealing and quenching and pressure was explored further in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Thermal expansion of CaFe2As2: Effect of cobalt doping and postgrowth thermal treatment

2013

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We report thermal expansion measurements on Ca(Fe1−xCox)2As2 single crystals with different thermal treatment, with samples chosen to represent four different ground states observed in this family. For all samples, thermal expansion is anisotropic with different signs of the in-plane and c-axis thermal expansion coefficients in the high temperature, tetragonal phase. The features in thermal expansion associated with the phase transitions are of opposite signs as well, pointing to a different response of transition temperatures to the in-plane and the c-axis stress. These features, and consequently the inferred pressure derivatives, are very large, clearly and substantially exceeding those in the Ba(Fe1−xCox)2As2 family. For all transitions the c-axis response is dominant. Keywords Physics and Astronomy Disciplines Condensed Matter Physics CommentsThis article is from Physical Review B 88 (2013) We report thermal expansion measurements on Ca(Fe 1−x Co x ) 2 As 2 single crystals with different thermal treatment, with samples chosen to represent four different ground states observed in this family. For all samples, thermal expansion is anisotropic with different signs of the in-plane and c-axis thermal expansion coefficients in the high temperature, tetragonal phase. The features in thermal expansion associated with the phase transitions are of opposite signs as well, pointing to a different response of transition temperatures to the in-plane and the c-axis stress. These features, and consequently the inferred pressure derivatives, are very large, clearly and substantially exceeding those in the Ba(Fe 1−x Co x ) 2 As 2 family. For all transitions the c-axis response is dominant.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal expansion of CaFe2As2: Effect of cobalt doping and postgrowth thermal treatment

2013

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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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Ab initio perspective on structural and electronic properties of iron‐based superconductors

Guterding

Backes

Tomić

et al. 2016

Physica Status Solidi (b)

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The discovery of iron pnictides and iron chalcogenides as a new class of unconventional superconductors in 2008 has generated an enormous amount of experimental and theoretical work that identifies these materials as correlated metals with multi‐orbital physics, where magnetism, nematicity, and superconductivity are competing phases that appear as a function of pressure and doping. A microscopic understanding of the appearance of these phases is crucial in order to determine the nature of superconductivity in these systems. Here, we review our recent theoretical efforts to describe and understand from first principles the properties of iron pnictides and chalcogenides with special focus on (i) pressure dependence, (ii) effects of electronic correlation, and (iii) origin of magnetism and superconductivity.

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Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1−xCox)

Cited by 66 publications

References 56 publications

Thermal expansion of CaFe2As2: Effect of cobalt doping and postgrowth thermal treatment

Thermal expansion of CaFe2As2: Effect of cobalt doping and postgrowth thermal treatment

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

Ab initio perspective on structural and electronic properties of iron‐based superconductors

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