TY - JOUR
T1 - 1/8 problems in the La-, Bi- and Y-based cuprates and new anomalies in the overdoped region of the La-based cuprate
AU - Koike, Y.
AU - Akoshima, M.
AU - Adachi, T.
AU - Kakinuma, N.
AU - Noji, T.
AU - Ono, Y.
AU - Nishizaki, T.
AU - Kobayashi, N.
AU - Watanabe, I.
AU - Nagamine, K.
PY - 1999
Y1 - 1999
N2 - Recent experimental work on the 1/8 problem by our group is reviewed not only in the La-based cuprate but also in the Bi- and Y-based ones. In the partially Zn-substituted Bi2Sr2Ca1-xYx(Cu 1-yZny)2O8+δ, we have found anomalous suppression of superconductivity at x = 0.30 = 0.35, where the hole concentration per Cu p ∼ 1/8. Moreover, it has been revealed from the μSR measurements that the Cu-spin fluctuations exhibit slowing-down behavior at low temperatures in these samples. These results are suggestive of the stripe correlations of holes and spins tending to be pinned by Zn at p ∼ 1/8 in the Bi-based cuprate as well as in the La-based cuprate. In Y1-xCaxBa2Cu3O7-δ, the 60 K plateau of Tc has been found not to be correlated with the oxygen content but to be interpreted as being due to the suppression of superconductivity at p ∼ 1/8. Accordingly, we conclude that the 1/8 problem is common to all high-Tc cuprates with the CuO2 plane. Moreover, we have found transport and Tc anomalies around x = 0.22 in La2-xSrxCu1-yMyO4 (M = Zn, Ga), suggesting a possibility that an order of holes and/or spins is formed or fluctuates in these samples in the overdoped region.
AB - Recent experimental work on the 1/8 problem by our group is reviewed not only in the La-based cuprate but also in the Bi- and Y-based ones. In the partially Zn-substituted Bi2Sr2Ca1-xYx(Cu 1-yZny)2O8+δ, we have found anomalous suppression of superconductivity at x = 0.30 = 0.35, where the hole concentration per Cu p ∼ 1/8. Moreover, it has been revealed from the μSR measurements that the Cu-spin fluctuations exhibit slowing-down behavior at low temperatures in these samples. These results are suggestive of the stripe correlations of holes and spins tending to be pinned by Zn at p ∼ 1/8 in the Bi-based cuprate as well as in the La-based cuprate. In Y1-xCaxBa2Cu3O7-δ, the 60 K plateau of Tc has been found not to be correlated with the oxygen content but to be interpreted as being due to the suppression of superconductivity at p ∼ 1/8. Accordingly, we conclude that the 1/8 problem is common to all high-Tc cuprates with the CuO2 plane. Moreover, we have found transport and Tc anomalies around x = 0.22 in La2-xSrxCu1-yMyO4 (M = Zn, Ga), suggesting a possibility that an order of holes and/or spins is formed or fluctuates in these samples in the overdoped region.
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U2 - 10.1142/s0217979299003398
DO - 10.1142/s0217979299003398
M3 - Article
AN - SCOPUS:27844559299
VL - 13
SP - 3546
EP - 3551
JO - International Journal of Modern Physics B
JF - International Journal of Modern Physics B
SN - 0217-9792
IS - 29-31
ER -