Revisiting the phase diagram of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LaFe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>AsO</mml:mi></mml:math>
 in single crystals by thermodynamic methods

Scaravaggi, Francesco; Sauerland, S.; Wang, L.; Kappenberger, Rhea; Lepucki, Piotr; Dioguardi, A. P.; Hong, X. C.; Caglieris, Federico; Wuttke, Christoph; Heß, Christian; Grafe, H.-J.; Aswartham, Saicharan; Wurmehl, S.; Klingeler, R.; Wolter, A. U. B.; Büchner, B.

doi:10.1103/physrevb.103.174506

Cited by 9 publications

(7 citation statements)

References 52 publications

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“…The maximum of (T 1 T ) −1 has been taken as T N , and the temperature where (T 1 T ) −1 increases more rapidly than the Curie-Weiss fit defines T S . These temperatures agree well with bulk measurements [15,34].…”

supporting

confidence: 89%

“…1 and 3(a)) as well as short-range magnetic order below T SRO ≈ 23 K. This is also the first doping that exhibits superconductivity, albeit with a strongly reduced volume fraction. Finally, x = 0.06 is the only doping with bulk superconductivity and absence of static nematicity and magnetism [34]. Nevertheless, compared to F-doping, the superconducting transition temperature is greatly reduced, and the weaker slope of T −1 1 below T c indicates scattering at impurities, which are most likely the in-plane Co-dopants.…”

mentioning

confidence: 95%

“…The reason for this is possibly the stronger coupling of nematicity and mag- [28]. Closed symbols are from NMR, open symbols are from SQUID and dilatometry [34]. T nem is determined by elastoresistivity [15].…”

mentioning

confidence: 99%

“…(Color online) Phase diagram resulting from NMRand SQUID susceptibility on Co-doped LaFeAsO single crystals compared to F-doped polycrystals[28]. Closed symbols are from NMR, open symbols are from SQUID and dilatometry[34]. T nem is determined by elastoresistivity[15].…”

mentioning

confidence: 99%

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Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR

Lepucki,

Havemann,

Dioguardi

et al. 2020

Preprint

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We determine the phase diagram of LaFe1−xCoxAsO single crystals by using nuclear magnetic resonance (NMR). Up to a nominal doping of x = 0.03, it follows the phase diagram for F-doped polycrystals. Above x = 0.03, the F-doped samples become superconducting, whereas for Co-doping the structural and magnetic transitions can be observed up to x = 0.042, and superconductivity occurs only for higher doping levels and with reduced transition temperatures. For dopings up to x = 0.056, we find evidence for short-range magnetic order. By means of relaxation-rate measurements, we map out the magnetic fluctuations that reveal the interplay of nematicity and magnetism. Above the nematic ordering, the spin fluctuations in LaFe1−xCoxAsO are identical to those in Ba(Fe1−xCox)2As2, suggesting that nematicity in LaFeAsO is a result of the fluctuating spin density wave as well.

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supporting

confidence: 89%

mentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR

Lepucki,

Havemann,

Dioguardi

et al. 2020

Preprint

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“…In contrast to BaFe 2 As 2 , LaFeAsO is showing separated magnetic and structural transitions. Both are gradually suppressed as a function of Co content x and vanish in a region x ≈ 4.5 % -5 %, a superconducting dome develops above x ≈ 5 % with an optimal doping level of x = 6 % [25,[28][29][30].…”

mentioning

confidence: 99%

Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

Wuttke¹,

Caglieris²,

Sykora³

et al. 2022

Preprint

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The role of nematic fluctuations for unconventional superconductivity has been subject of intense discussions for many years. In iron-based superconductors, the most established probe for electronic-nematic fluctuations, i.e. the elastoresistivity seems to imply that superconductivity is reinforced by electronic-nematic fluctuations, since the elastoresistivity amplitude peaks at or close to optimal T c . However, on the over-doped side of the superconducting dome, the diminishing elastoresistivity suggests a negligible importance in the mechanism of superconductivity. Here we introduce the Nernst coefficient

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Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

et al. 2022

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The role of nematic fluctuations for unconventional superconductivity has been the subject of intense discussions for many years. In iron-based superconductors, the most established probe for electronic-nematic fluctuations, i.e. the elastoresistivity seems to imply that superconductivity is reinforced by electronic-nematic fluctuations, since the elastoresistivity amplitude peaks at or close to optimal Tc. However, on the over-doped side of the superconducting dome, the diminishing elastoresistivity suggests a negligible importance in the mechanism of superconductivity. Here we introduce the Nernst coefficient as a genuine probe for electronic nematic fluctuations, and we show that the amplitude of the Nernst coefficient tracks the superconducting dome of two prototype families of iron-based superconductors, namely Rh-doped BaFe2As2 and Co-doped LaFeAsO. Our data thus provide fresh evidence that in these systems, nematic fluctuations foster the superconductivity throughout the phase diagram.

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Revisiting the phase diagram of LaFe1−xCoxAsO in single crystals by thermodynamic methods

Cited by 9 publications

References 52 publications

Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR

Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR

Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

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