Chinese Journal of Physics[V35-No.6]

VOLUME 35, NUMBER 6, PART II

DECEMBER 1997

Anisotropic Magnetic and Calorimetric Properties of the Incommensurate Modulated Single Crystal
H. C. Ku¹, T. I. Hsu¹, Y. Y. Hsu¹, T. J. Lee¹, K. W. Yeh², Y. Huang², J. Y. Lin³, S. J. Chen³, H. D. Yang³, Y. Y. Chen⁴, J. C. Ho⁵, and X.-G. Li⁶ ¹ Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300, R.O.C. ² Materials Research Center, NTHU, Hsinchu, Taiwan 300, R.O.C. ³ Department of Physics, National Sun Yat-Sen University, Kaohsiung 840, R.O.C. ⁴ Institute of Physics, Academia Sinica, Nankang, Taiwan 115, R.O.C. ⁵ Department of Physics, Wichita State University, Wichita, Kansas 67260, U.S.A. ⁶ Structural Research Laboratory, University of Science and Technology of China, Anhui 230026, China (Received October 9, 1997)
Anisotropic magnetic and calorimetric properties of the incommensurate modulated single crystals have been reported. No Pr magnetic ordering was observed down to 0.5 K in specific heat data and in anisotropic magnetic susceptibility measurements for magnetic field applied along the single crystal orthorhombic ab-plane or c-axis. In comparison, isostructural Gd polycrystalline sample exhibits an antiferromagnetic order with Neel temperature T_N(Gd) of 1.7 K. The compound represents the first example of no Pr anomaly observed for all two-CuO₂-layers Pr cuprates M_mA₂PrCu₂O_y (M = Hg, Pb, Tl, Bi, Nb, Cu; A = Ba, Sr; m = 1, 2, 3). The lack of Pr ordering is believed to be due to a very weak quasi-2D Pr-O-Pr superexchange interaction caused by the strong structural modulation.

Anisotropic Magnetic and Calorimetric Properties of the Incommensurate Modulated

Single Crystal

H. C. Ku¹, T. I. Hsu¹, Y. Y. Hsu¹, T. J. Lee¹, K. W. Yeh²,
Y. Huang², J. Y. Lin³, S. J. Chen³, H. D. Yang³, Y. Y. Chen⁴, J. C. Ho⁵, and X.-G. Li⁶

¹ Department of Physics, National Tsing Hua University,
Hsinchu, Taiwan 300, R.O.C.
² Materials Research Center, NTHU, Hsinchu, Taiwan 300, R.O.C.
³ Department of Physics, National Sun Yat-Sen University, Kaohsiung 840, R.O.C.
⁴ Institute of Physics, Academia Sinica, Nankang, Taiwan 115, R.O.C.
⁵ Department of Physics, Wichita State University, Wichita, Kansas 67260, U.S.A.
⁶ Structural Research Laboratory, University of Science and Technology of China,
Anhui 230026, China

(Received October 9, 1997)

Anisotropic magnetic and calorimetric properties of the incommensurate modulated

single crystals have been reported. No Pr magnetic ordering was observed down to 0.5 K in specific heat data and in anisotropic magnetic susceptibility measurements for magnetic field applied along the single crystal orthorhombic ab-plane or c-axis. In comparison, isostructural Gd polycrystalline sample

exhibits an antiferromagnetic order with Neel temperature T_N(Gd) of 1.7 K. The

compound represents the first example of no Pr anomaly observed for all two-CuO₂-layers Pr cuprates M_mA₂PrCu₂O_y (M = Hg, Pb, Tl, Bi, Nb, Cu; A = Ba, Sr; m = 1, 2, 3). The lack of Pr ordering is believed to be due to a very weak quasi-2D Pr-O-Pr superexchange interaction caused by the strong structural modulation.

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