TY - JOUR
T1 - μSR and NMR study on quantum critical point in quantum spin ladder (CH3)2CHNH3Cu(ClxBr 1-x)3
AU - Nakajima, S.
AU - Goto, T.
AU - Suzuki, T.
AU - Watanabe, I.
AU - Manaka, H.
AU - Amato, A.
PY - 2010
Y1 - 2010
N2 - (CH3)2CHNH3Cu(ClxBr 1-x)3 abbreviated IPACu(ClxBr 1-x)3 is a mixed system of spin-gap compounds IPACuCl 3 and IPACuBr3. This mixed system is reported by macroscopic measurements to show a magnetic order when the value of x is between the quantum critical points (QCPs) 0.44 and 0.87. We have investigated microscopically the ground state of the samples x = 0.40, 0.45 and 0.50 which are located near the QCP of xc = 0.44, by Muon Spin Relaxation (μSR) and NMR measurements. For x = 0.40, μSR measurements in zero and longitudinal fields have shown that the spin fluctuation shows a significant slowing down with decreasing temperature, although the magnetic order does not appear down to T = 15 mK, indicating that the ground state is an exotic one rather than a gapped one. For x = 0.45 and 0.50, μSR and NMR measurements do not show any magnetic order at low temperatures, indicating that the QCP is larger than the reported value of xc = 0.44.
AB - (CH3)2CHNH3Cu(ClxBr 1-x)3 abbreviated IPACu(ClxBr 1-x)3 is a mixed system of spin-gap compounds IPACuCl 3 and IPACuBr3. This mixed system is reported by macroscopic measurements to show a magnetic order when the value of x is between the quantum critical points (QCPs) 0.44 and 0.87. We have investigated microscopically the ground state of the samples x = 0.40, 0.45 and 0.50 which are located near the QCP of xc = 0.44, by Muon Spin Relaxation (μSR) and NMR measurements. For x = 0.40, μSR measurements in zero and longitudinal fields have shown that the spin fluctuation shows a significant slowing down with decreasing temperature, although the magnetic order does not appear down to T = 15 mK, indicating that the ground state is an exotic one rather than a gapped one. For x = 0.45 and 0.50, μSR and NMR measurements do not show any magnetic order at low temperatures, indicating that the QCP is larger than the reported value of xc = 0.44.
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U2 - 10.1088/1742-6596/200/2/022036
DO - 10.1088/1742-6596/200/2/022036
M3 - Conference article
AN - SCOPUS:77957166828
SN - 1742-6588
VL - 200
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - SECTION 2
M1 - 022036
ER -