Muon spin rotation and infrared spectroscopy study of Ba$_{1-x}$Na$_{x}$Fe$_{2}$As$_{2}$

Sheveleva, Evgeniia; Xu, Bing; Marsik, Premysl; Lyzwa, Fryderyk; Mallett, Benjamin P. P.; Willa, K.; Meingast, C.; Wolf, Th.; Shevtsova, T.; Pashkevich, Yu. G.; Bernhard, Christian

doi:10.1103/PhysRevB.101.224515

Back

Journal article

Muon spin rotation and infrared spectroscopy study of Ba$_{1-x}$Na$_{x}$Fe$_{2}$As$_{2}$

Sheveleva, Evgeniia University of Fribourg
Xu, Bing University of Fribourg
Marsik, Premysl University of Fribourg
Lyzwa, Fryderyk University of Fribourg
Mallett, Benjamin P. P. The MacDiarmid Institute for Advanced Materials and Nanotechnology and The Dodd-Walls Centre for Photonic and Quantum Technologies, The University of Auckland, NZ-1010 Auckland, New Zealand
Willa, K. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
Meingast, C. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
Wolf, Th. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
Shevtsova, T. O. O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, UA-03680 Kyiv, Ukraine
Pashkevich, Yu. G. O. O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, UA-03680 Kyiv, Ukraine
Bernhard, Christian University of Fribourg

2020

Published in:

Physical Review B. - 2020, vol. 101, no. 22, p. 224515

High Tc superconductors

English The magnetic and superconducting properties of a series of underdoped Ba 1 − x Na x Fe 2 As 2 (BNFA) single crystals with 0.19 ≤ x ≤ 0.34 have been investigated with the complementary muon-spin-rotation ( μ SR ) and infrared spectroscopy techniques. The focus has been on the different antiferromagnetic states in the underdoped regime and their competition with superconductivity, especially for the ones with a tetragonal crystal structure and a so-called double-Q magnetic order. Besides the collinear state with a spatially inhomogeneous spin-charge-density wave (i-SCDW) order at x = 0.24 and 0.26, that was previously identified in BNFA, we obtained evidence for an orthomagnetic state with a “hedgehog”-type spin vortex crystal (SVC) structure at x = 0.32 and 0.34. Whereas in the former i-SCDW state the infrared spectra show no sign of a superconducting response down to the lowest measured temperature of about 10 K, in the SVC state there is a strong superconducting response similar to the one at optimum doping. The magnetic order is strongly suppressed here in the superconducting state and at x = 0.34 there is even a partial reentrance into a paramagnetic state at T ≪ T c .

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language