Pressure effects on the electronic properties of the undoped superconductor ThFeAsN

Barbero, Nicolò; Holenstein, Stefan; Shang, T.; Shermadini, Z.; Lochner, Felix; Eremin, I.; Wang, Cao; Cao, Guang‐Han; Khasanov, R.; Ott, H. R.; Mesot, J.; Shiroka, T.

doi:10.1103/physrevb.97.140506

Cited by 10 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study of stoichiometric iron pnictide superconductors has been of particular interest, due to the advantage of having reduced disorder, which can be useful for the development of realistic theoretical models for understanding the unconventional superconductivity in the Febased materials. Recently, Wang et al 144,145 . Electronic structure calculations show the presence of nested hole and electron Fermi surfaces 140,141 , and as a result this material presents the scenario of a stoichiometric material near optimal T c , which has an electronic structure much like most other FeSCs.…”

Section: Multiband Superconductivity In Thfeasnmentioning

confidence: 99%

A brief review on μSR studies of unconventional Fe- and Cr-based superconductors

Bhattacharyya

Adroja

Smidman

et al. 2018

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

Muon spin relaxation/rotation (µSR) is a very useful technique for probing the superconducting gap structure, pairing symmetry and time reversal symmetry breaking, enabling an understanding of the mechanisms behind the unconventional superconductivity of cuprates and Fe-based hightemperature superconductors, which remain a puzzle. Very recently double layered Fe-based superconductors having quasi-2D crystal structures and Cr-based superconductors with a quasi-1D structure have drawn considerable attention. Here we present a brief review of the characteristics of a few selected Fe-and Cr-based superconducting materials and highlight some of the major unsolved problems, with an emphasis on the superconducting pairing symmetries of these materials. We focus on µSR studies of the newly discovered superconductors ACa2Fe4As4F2 (A = K, Rb, and Cs), ThFeAsN, and A2Cr3As3 (A = K, Cs), which were used to determine the superconducting gap structures, the presence of spin fluctuations, and to search for time reversal symmetry breaking in the superconducting states. We also briefly discuss the results of µSR investigations of the superconductivity in hole and electron doped BaFe2As2.

show abstract

Section: Multiband Superconductivity In Thfeasnmentioning

confidence: 99%

A brief review on μSR studies of unconventional Fe- and Cr-based superconductors

Bhattacharyya

Adroja

Smidman

et al. 2018

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

show abstract

“…Pressure is an important control parameter that can effectively shrink the lattice, thus change the corresponding electronic states and transport properties. For this new superconductor containing an actinide element, Barbero et al [31] studied the pressure effect up to 3 GPa, finding that pressure induces a slight decrease of T C (−1.1 K/GPa). It is of interest to know how the T C of ThFeAsN changes at higher pressures and whether it follows the rule of As-Fe-As angle vs. T C or anion height vs. T C , which is an interesting topic on FeAs-based superconductors.…”

mentioning

confidence: 99%

Pressure effects on superconductivity and structural parameters of ThFeAsN

Wang

Guo

Shao

et al. 2018

EPL

View full text Add to dashboard Cite

Here we report effects of pressure on the recently discovered iron-based superconductor ThFeAsN, the first FeAs-based superconductor containing an actinide element, by in situ high-pressure resistance and synchrotron X-ray diffraction measurements. Our results show that the superconducting transition temperature (TC) decreases monotonously with increasing pressure and then vanishes at 25.4 GPa. The analysis of the As anion height above the Fe layer (), as well as the bond angle of As-Fe-As (α), for the pressurized ThFeAsN sample found that its TC vs. or α follows the same universal curve describing most of the iron-based superconductors. The results indicate that the lattice parameters also control the superconductivity of the ThFeAsN superconductor, similar to other FeAs-based superconductors, as long as the “superconducting gene” is a FeAs layer. Furthermore, we demonstrate that the ambient-pressure ThFeAsN is an “intrinsic” superconductor, while its lattice structure is not in the optimal state of the FeAs-based superconductors.

show abstract

“…ThFeAsN takes an unusual role in this respect, since the ground state has been reported to already be non-magnetic and superconducting, without the need of external parameter tuning [1,6,7]. Additionally, it has been shown that applying pressure to this system decreases T c [8], which is in contrast to other Fe-based superconductors, such as bulk FeSe [9].…”

Section: Introductionmentioning

confidence: 99%

“…The signchange of the superconducting gap between electron and hole pockets is commonly associated with antiferromagnetic spin fluctuations as driving force for the Cooper pair formation [13,14]. As for ThFeAsN, Barbero et al have found a pressure independent s ± -wave symmetry of the order parameter by performing Knight shift and muon-spin rotation measurements [8]. Similarly, Wang et al classified this compound as comparable to other Fe-based superconductors with respect to outcomes from magnetic susceptibility measurements, attributing an important role to antiferromagnetic spin fluctuations [1].…”

Section: Introductionmentioning

confidence: 99%

Exploring multichannel superconductivity in ThFeAsN

Schrodi,

Kabeer,

Aperis

et al. 2021

Preprint

View full text Add to dashboard Cite

We investigate theoretically the superconducting state of the undoped Fe-based superconductor ThFeAsN. Using input from ab initio calculations, we solve the Fermi-surface based, multichannel Eliashberg equations for Cooper-pair formation mediated by spin and charge fluctuations, and by the electron-phonon interaction (EPI). Our results reveal that spin fluctuations alone, when coupling only hole-like with electron-like energy bands, can account for a critical temperature Tc up to ∼ 7.5 K with an s±-wave superconducting gap symmetry, which is a comparatively low Tc with respect to the experimental value T exp c = 30 K. Other combinations of interaction kernels (spin, charge, electronphonon) lead to a suppression of Tc due to phase frustration of the superconducting gap. We qualitatively argue that the missing ingredient to explain the gap magnitude and Tc in this material is the first-order correction to the EPI vertex. In the noninteracting state this correction adopts a form supporting the s± gap symmetry, in contrast to EPI within Migdal's approximation, i.e., EPI without vertex correction, and therefore it enhances tendencies arising from spin fluctuations.

show abstract

Pressure effects on the electronic properties of the undoped superconductor ThFeAsN

Cited by 10 publications

References 49 publications

A brief review on μSR studies of unconventional Fe- and Cr-based superconductors

A brief review on μSR studies of unconventional Fe- and Cr-based superconductors

Pressure effects on superconductivity and structural parameters of ThFeAsN

Exploring multichannel superconductivity in ThFeAsN

Contact Info

Product

Resources

About