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Magnetic order in the CaFe 1 − x Co x AsF ( x = 0.00 , 0.06 , 0.12 ) superconducting compounds

Magnetic order in the CaFe 1 − x Co x AsF ( x = 0.00 , 0.06 , 0.12 ) superconducting compounds A neutron powder-diffraction experiment has been performed to investigate the structural phase transition and magnetic order in CaFe 1 − x Co x AsF superconductor compounds ( x = 0.00 , 0.06 , 0.12 ) . The parent compound CaFeAsF undergoes a tetragonal to orthorhombic phase transition at 134(3) K, while the magnetic order in the form of a spin-density wave (SDW) sets in at 114(3) K. The antiferromagnetic structure of the parent compound has been determined with a unique propagation vector k = ( 1 , 0 , 1 ) and the Fe saturation moment of 0.49 ( 5 ) μ B , aligned along the long a axis. With increasing Co doping, the long-range antiferromagnetic order has been observed to coexist with superconductivity in the orthorhombic phase of the underdoped CaFe 0.94 Co 0.06 AsF with a reduced Fe moment ∼ 0.15 ( 5 ) μ B . Magnetic order is completely suppressed in optimally doped CaFe 0.88 Co 0.12 AsF . We argue that the coexistence of SDW and superconductivity might be related to mesoscopic phase separation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Magnetic order in the CaFe 1 − x Co x AsF ( x = 0.00 , 0.06 , 0.12 ) superconducting compounds

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2009 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.79.060504
Publisher site
See Article on Publisher Site

Abstract

A neutron powder-diffraction experiment has been performed to investigate the structural phase transition and magnetic order in CaFe 1 − x Co x AsF superconductor compounds ( x = 0.00 , 0.06 , 0.12 ) . The parent compound CaFeAsF undergoes a tetragonal to orthorhombic phase transition at 134(3) K, while the magnetic order in the form of a spin-density wave (SDW) sets in at 114(3) K. The antiferromagnetic structure of the parent compound has been determined with a unique propagation vector k = ( 1 , 0 , 1 ) and the Fe saturation moment of 0.49 ( 5 ) μ B , aligned along the long a axis. With increasing Co doping, the long-range antiferromagnetic order has been observed to coexist with superconductivity in the orthorhombic phase of the underdoped CaFe 0.94 Co 0.06 AsF with a reduced Fe moment ∼ 0.15 ( 5 ) μ B . Magnetic order is completely suppressed in optimally doped CaFe 0.88 Co 0.12 AsF . We argue that the coexistence of SDW and superconductivity might be related to mesoscopic phase separation.

Journal

Physical Review B – American Physical Society (APS)

Published: Feb 1, 2009

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