Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction

J. M. Allred; K. M. Taddei; D. E. Bugaris; S. Avci; D. Y. Chung; H. Claus; C. Dela Cruz; M. G. Kanatzidis; S. Rosenkranz; R. Osborn; O. Chmaissem

doi:10.1103/PhysRevB.90.104513

Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction

J. M. Allred, K. M. Taddei, D. E. Bugaris, S. Avci, D. Y. Chung, H. Claus, C. Dela Cruz, M. G. Kanatzidis, S. Rosenkranz, R. Osborn, O. Chmaissem

Northwestern University

Research output: Contribution to journal › Article

28 Citations (Scopus)

Abstract

We present neutron diffraction analysis of BaFe2(As1-xPx)2 over a wide temperature (10 to 300 K) and compositional (0.11≤x≤0.79) range, including the normal state, the magnetically ordered state, and the superconducting state. The paramagnetic to spin-density wave and orthorhombic to tetragonal transitions are first order and coincident within the sensitivity of our measurements (∼0.5 K). Extrapolation of the orthorhombic order parameter down to zero suggests that structural quantum criticality cannot exist at compositions higher than x=0.28, which is much lower than values determined using other methods, but in good agreement with our observations of the actual phase stability range. The onset of spin-density wave order shows a stronger structural anomaly than the charge-doped system in the form of an enhancement of the c/a ratio below the transition.

Original language	English
Article number	104513
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.90.104513
Publication status	Published - Sep 19 2014

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Allred, J. M., Taddei, K. M., Bugaris, D. E., Avci, S., Chung, D. Y., Claus, H., Dela Cruz, C., Kanatzidis, M. G., Rosenkranz, S., Osborn, R., & Chmaissem, O. (2014). Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction. Physical Review B - Condensed Matter and Materials Physics, 90(10), [104513]. https://doi.org/10.1103/PhysRevB.90.104513

Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction. / Allred, J. M.; Taddei, K. M.; Bugaris, D. E.; Avci, S.; Chung, D. Y.; Claus, H.; Dela Cruz, C.; Kanatzidis, M. G.; Rosenkranz, S.; Osborn, R.; Chmaissem, O.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 10, 104513, 19.09.2014.

Research output: Contribution to journal › Article

Allred, JM, Taddei, KM, Bugaris, DE, Avci, S, Chung, DY, Claus, H, Dela Cruz, C, Kanatzidis, MG, Rosenkranz, S, Osborn, R & Chmaissem, O 2014, 'Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction', Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 10, 104513. https://doi.org/10.1103/PhysRevB.90.104513

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abstract = "We present neutron diffraction analysis of BaFe2(As1-xPx)2 over a wide temperature (10 to 300 K) and compositional (0.11≤x≤0.79) range, including the normal state, the magnetically ordered state, and the superconducting state. The paramagnetic to spin-density wave and orthorhombic to tetragonal transitions are first order and coincident within the sensitivity of our measurements (∼0.5 K). Extrapolation of the orthorhombic order parameter down to zero suggests that structural quantum criticality cannot exist at compositions higher than x=0.28, which is much lower than values determined using other methods, but in good agreement with our observations of the actual phase stability range. The onset of spin-density wave order shows a stronger structural anomaly than the charge-doped system in the form of an enhancement of the c/a ratio below the transition.",

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