TY - JOUR
T1 - Incommensurate mgnetism in FeAs srips
T2 - Neutron sattering from CaFe 4As3
AU - Nambu, Yusuke
AU - Zhao, Liang L.
AU - Morosan, Emilia
AU - Kim, Kyoo
AU - Kotliar, Gabriel
AU - Zajdel, Pawel
AU - Green, Mark A.
AU - Ratcliff, William
AU - Rodriguez-Rivera, Jose A.
AU - Broholm, Collin
PY - 2011/1/18
Y1 - 2011/1/18
N2 - Magnetism in the orthorhombic metal CaFe4As3 was examined through neutron diffraction for powder and single crystalline samples. Incommensurate [qm≈(0.37-0.39)×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 β=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) μB for Fe2+ and from 1.3(3) to 2.4(4)μB for Fe+. The ab initio Fermi surface is consistent with a nesting instability in cross-linked FeAs strips.
AB - Magnetism in the orthorhombic metal CaFe4As3 was examined through neutron diffraction for powder and single crystalline samples. Incommensurate [qm≈(0.37-0.39)×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 β=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) μB for Fe2+ and from 1.3(3) to 2.4(4)μB for Fe+. The ab initio Fermi surface is consistent with a nesting instability in cross-linked FeAs strips.
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U2 - 10.1103/PhysRevLett.106.037201
DO - 10.1103/PhysRevLett.106.037201
M3 - Article
AN - SCOPUS:78751472187
SN - 0031-9007
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 037201
ER -