TY - JOUR
T1 - Complex magnetic structures of a Shastry-Sutherland lattice TmB 4 studied by powder neutron diffraction analysis
AU - Michimura, Shinji
AU - Shigekawa, Akira
AU - Iga, Fumitoshi
AU - Takabatake, Toshiro
AU - Ohoyama, Kenji
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2009/2
Y1 - 2009/2
N2 - Powder neutron diffraction analysis was performed on Tm 11B 4, which undergoes successive transitions at T N1 = 11.7 K, T* = 11 K, and T N2 = 10 K. An incommensurate structure with two propagation vectors, k 2 = [1 ± k′ ± k″, ±k″; 0] and k 2′ = [1 ± k′ ± 3k″, ±k″; 0] (k′ = 0.1226 and k″ ≃ 0.012), is suggested for phase II (T* ≤ T ≤ T N1). Phase III (T N2 ≤ T ≤ T*) is described by one propagation vector, k 3 = [1 ± k′, 0, 0]. The propagation vector for phase IV (T ≤ T N2) further changes to a commensurate one characterized by k 4 = [100]. Four Tm moments in the c-plane order in a (+-+--) type, where + and -- mean the directions of the moments parallel and antiparallel to the c-direction, respectively. The diffuse scattering intensity around the (100) magnetic reflection remains above T N2 up to 20 K.
AB - Powder neutron diffraction analysis was performed on Tm 11B 4, which undergoes successive transitions at T N1 = 11.7 K, T* = 11 K, and T N2 = 10 K. An incommensurate structure with two propagation vectors, k 2 = [1 ± k′ ± k″, ±k″; 0] and k 2′ = [1 ± k′ ± 3k″, ±k″; 0] (k′ = 0.1226 and k″ ≃ 0.012), is suggested for phase II (T* ≤ T ≤ T N1). Phase III (T N2 ≤ T ≤ T*) is described by one propagation vector, k 3 = [1 ± k′, 0, 0]. The propagation vector for phase IV (T ≤ T N2) further changes to a commensurate one characterized by k 4 = [100]. Four Tm moments in the c-plane order in a (+-+--) type, where + and -- mean the directions of the moments parallel and antiparallel to the c-direction, respectively. The diffuse scattering intensity around the (100) magnetic reflection remains above T N2 up to 20 K.
KW - Frustration
KW - Magnetic structure
KW - Neutron powder diffraction
KW - Shastry-Sutherland lattice
KW - TmB
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U2 - 10.1143/JPSJ.78.024707
DO - 10.1143/JPSJ.78.024707
M3 - Article
AN - SCOPUS:60249089870
VL - 78
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 2
M1 - 024707
ER -