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2008/04/07(Mon) 21:56

In-Plane Electrical Resistivity in High Magnetic Fields and Stripe Order in La2-xBaxCuO4 around x = 1/8: Implication for the Field-Induced Stripe Order
La2-xBaxCuO4x ~ 1/8における強磁場中面内電気抵抗率とストライプ秩序:磁場誘起ストライプ秩序の可能性


Magnetic-field effects on the so-called charge-spin stripe order in La2-xBaxCuO4 around x = 1/8 have been investigated from the in-plane electrical-resistivity, ρab, measurements. For x = 0.10, the superconducting transition curve changes from a broadening in low fields to a parallel shift in high fields above 9 T. Moreover, the normal-state value of ρab at low temperatures markedly increases with increasing field up to 27 T. It is possible that these pronounced features of x = 0.10 are understood in terms of the magnetic-field-induced stabilization of the stripe order.

Dept. of Appl. Phys., Tohoku University: T. Adachi, T. Kawamata, T. Manabe, Y. Koike
IMR, Tohoku University: K. Kudo, T. Sasaki, N. Kobayashi

Reference: T. Adachi, N. Kitajima, T. Manabe, Y. Koike, K. Kudo, T. Sasaki, N. Kobayashi,
"Magnetic-field effects on the in-plane electrical resistivity in single-crystal La2-xBaxCuO4 and La1.6-xNd0.4SrxCuO4 around x = 1/8: Implication for the field-induced stripe order", Phys. Rev. B 71 (2004) 104516.

La2-xBaxCuO4x ~ 1/8において,いわゆる電荷とスピンのストライプ秩序に対する磁場効果を面内電気抵抗率測定から調べた.その結果,x = 0.10において,磁場の増加とともに抵抗転移カーブがブロードニングからパラレルシフトに変わり,さらに常伝導抵抗率が27 Tまで増加することを見出した.これらの振る舞いは,磁場によるストライプ秩序の安定化で理解できると結論した.

東北大学大学院工学研究科:足立 匡,川股隆行,眞鍋 武,小池洋二