TY - JOUR
T1 - Impurity effects on a 2-leg spin ladder compound SrCu2O3
AU - Takano, M.
AU - Azuma, M.
AU - Fujishiro, Y.
AU - Nohara, M.
AU - Takagi, H.
AU - Fujiwara, M.
AU - Yasuoka, H.
AU - Ohsugi, S.
AU - Kitaoka, Y.
AU - Eccleston, R. S.
N1 - Funding Information:
This work was partly supported by a Grant-in Aid for Scientific Research on Priority Areas, "Anomalous metallic state near the Mott transition", of Ministry of Education, Science and Culture, Japan and CREST (Core Research for Evolutional Science and Technology) of Japan Science and Technology Corporation (JST).
PY - 1997/8
Y1 - 1997/8
N2 - Measurements of magnetic susceptibility, specific heat and inelastic neutron scattering were performed on a Zn-substituted spin-1/2 Heisenberg 2-leg ladder compound Sr(Cu1-xZnx)2O3 (x ≤ 0.08) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about ∼ 400 K. A clear anomaly attributed to the onset of antiferromagnetic ordering was observed both in the magnetic susceptibility and specific heat data even at only 1 % of Zn. The Néel temperature showed a systematic Zn-concentration dependence with a broad maximum at around 4 % substitution (TNmax ∼ 8K). A finite amount of T-linear term with a coefficient of γ ∼ 3.5 mJ/K2 was observed in the specific heat above TN for x = 0.02 and 0.04, suggesting the existence of a finite density of states at E = 0 in the spin excitation spectrum as supported by the inelastic neutron scattering measurement.
AB - Measurements of magnetic susceptibility, specific heat and inelastic neutron scattering were performed on a Zn-substituted spin-1/2 Heisenberg 2-leg ladder compound Sr(Cu1-xZnx)2O3 (x ≤ 0.08) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about ∼ 400 K. A clear anomaly attributed to the onset of antiferromagnetic ordering was observed both in the magnetic susceptibility and specific heat data even at only 1 % of Zn. The Néel temperature showed a systematic Zn-concentration dependence with a broad maximum at around 4 % substitution (TNmax ∼ 8K). A finite amount of T-linear term with a coefficient of γ ∼ 3.5 mJ/K2 was observed in the specific heat above TN for x = 0.02 and 0.04, suggesting the existence of a finite density of states at E = 0 in the spin excitation spectrum as supported by the inelastic neutron scattering measurement.
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U2 - 10.1016/S0921-4534(97)00245-1
DO - 10.1016/S0921-4534(97)00245-1
M3 - Article
AN - SCOPUS:17544398324
SN - 0921-4534
VL - 282-287
SP - 149
EP - 152
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 1
ER -