Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/5380
Title: Neutron scattering study of underdoped Ba(1-x)KxFe2As2 (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point
Authors: Rotundu, CR
Tian, W
Rule, KC
Forrest, TR
Zhao, J
Zarestky, JL
Birgeneau, RJ
Keywords: Neutrons
Crystals
Superconductivity
Antiferromagnetism
Magnetism
Potassium
Issue Date: 4-Apr-2012
Publisher: American Physical Society
Citation: Rotundu, C. R., Tian, W., Rule, K. C., Forrest, T. R., Zhao, J., Zarestky, J. L., & Birgeneau, R. J. (2012). Neutron scattering study of underdoped Ba(1-x)KxFe2As2 (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point. Physical Review B, 85(14), Article Number 144506. doi:10.1103/PhysRevB.85.144506
Abstract: We present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on underdoped superconducting Ba(1-x)KxFe2As2 (x=0.09 and 0.17), and the same measurements in zero field on a nonsuperconducting crystal with x = 0.09. The data suggest that the underdoped materials may not be electronic phase separated but rather have slightly inhomogeneous potassium doping. The temperature dependence of the magnetic order parameter below the transition of the sample with x = 0.09 is more gradual than that for the case of the undoped BaFe2As2, suggesting that this doping may be in the vicinity of a tricritical point. We advance therefore the hypothesis that the tricritical point is a common feature of all superconducting 122s. For the x = 0.17 sample, while T-c is suppressed from approximate to 17 to approximate to 8 K by a magnetic field of 14 T, the intensity of the magnetic Bragg peaks (1 0 3) at 1.2 K is enhanced by 10%, showing competition of superconductivity and antiferromagnetism. The intensity of the magnetic Bragg peaks (1 0 3) in the (T-c, T-N) temperature interval remain practically unchanged in 14.5 T within a 10% statistical error. The present results are discussed in the context of the existing literature. © 2012, American Physical Society.
Gov't Doc #: 4624
URI: http://dx.doi.org/10.1103/PhysRevB.85.144506
http://apo.ansto.gov.au/dspace/handle/10238/5380
ISSN: 1098-0121
Appears in Collections:Journal Articles

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