TY - JOUR
T1 - Coexistence of gap-less and gapped excitations in NH4CuCl 3
AU - Nojiri, Hiroyuki
AU - Tanaka, Hidekazu
AU - Kurniawan, Buddy
AU - Motokawa, Mitsuhiro
N1 - Funding Information:
This work was partly supported by Grant-in-Aid on Priority Area ‘Field-Induced New Quantum Phenomena in Magnetic Systems’ from the Ministry of Education, Science, Sports and Culture of Japan.
PY - 2003/5
Y1 - 2003/5
N2 - A low-temperature ESR investigation is performed on a low-dimensional compound NH4CuCl3 with magnetization plateaux. In the phase below the 1/4-plateau, a coexistence of gapped two triplets and a gap-less mode is found. Below 1.3 K at which a part of spins show some magnetic ordering, the higher energy triplet mode exhibit no change. In addition to the previously reported gapped modes at 1/4- and 3/4- plateaux, a new low energy mode is found at the half of the saturation field. This mode may be caused by an 'irrelevant instability' of 1/2-plateau.
AB - A low-temperature ESR investigation is performed on a low-dimensional compound NH4CuCl3 with magnetization plateaux. In the phase below the 1/4-plateau, a coexistence of gapped two triplets and a gap-less mode is found. Below 1.3 K at which a part of spins show some magnetic ordering, the higher energy triplet mode exhibit no change. In addition to the previously reported gapped modes at 1/4- and 3/4- plateaux, a new low energy mode is found at the half of the saturation field. This mode may be caused by an 'irrelevant instability' of 1/2-plateau.
KW - Electron spin resonance
KW - High magnetic field
KW - Magnetization plateau
KW - Spin gap
UR - http://www.scopus.com/inward/record.url?scp=23044488081&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(02)02012-4
DO - 10.1016/S0921-4526(02)02012-4
M3 - Article
AN - SCOPUS:23044488081
VL - 329-333
SP - 701
EP - 702
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - II
ER -