TY - JOUR
T1 - ESR study of the opening and closing of the field-induced gap in NH4CuCl3
AU - Kurniawan, B.
AU - Tanaka, H.
AU - Takatsu, K.
AU - Shiramura, W.
AU - Fukuda, T.
AU - Nojiri, H.
AU - Motokawa, M.
PY - 1999
Y1 - 1999
N2 - ESR measurements in the double-chain compound NH4CuCl3which has magnetization plateaus at one-quarter and three-quarters of the saturation magnetization, have been performed in magnetic fields up to 30 T in the frequency range ˜95–762GHz. It is found that the frequency versus field diagrams for H|a and H|b coincide when normalized by the g factors. In each plateau region, a pair of excitations expressed as ω=γ(H-Hlc) and ω=γ(Hhc-H) are observed, where Hlc and Hhc are the lower and higher edge fields of the plateau, respectively. These two modes correspond to the quantum gap in the lower- and higher-field halves in the plateau region.
AB - ESR measurements in the double-chain compound NH4CuCl3which has magnetization plateaus at one-quarter and three-quarters of the saturation magnetization, have been performed in magnetic fields up to 30 T in the frequency range ˜95–762GHz. It is found that the frequency versus field diagrams for H|a and H|b coincide when normalized by the g factors. In each plateau region, a pair of excitations expressed as ω=γ(H-Hlc) and ω=γ(Hhc-H) are observed, where Hlc and Hhc are the lower and higher edge fields of the plateau, respectively. These two modes correspond to the quantum gap in the lower- and higher-field halves in the plateau region.
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U2 - 10.1103/PhysRevLett.82.1281
DO - 10.1103/PhysRevLett.82.1281
M3 - Article
AN - SCOPUS:0001296082
VL - 82
SP - 1281
EP - 1284
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 6
ER -