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Abstract:
Magnetism in the orthorhombic metal CaFe4As3 was examined through neutron diffraction for powder and single crystalline samples. Incommensurate (qm approx. equal to (0.37-0.39) x b*) and predominantly longitudinally (|| b) modulated order develops through a 2nd order phase transition at TN = 89.63(6) K with a 3D Heisenberg-like critical exponent Beta = 0.365(6). A 1st order transition at T2 = 25.6(9) K is associated with the development of a transverse component, locking qm to 0.375(2)b*, and increasing the moments from 2.1(1) to 2.2(3) micro-B for Fe2+ and from 1.3(3) to 2.4(4) micro-B for Fe+. The ab-initio Fermi surface is consistent with a nesting instability in cross-linked FeAs strips.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Electronic preprint |
| Pages: |
6 |
| Report Date: |
21 DEC 2010 |
| Report Number: |
A417435 |
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