Observation of Pr and Gd ordering in the 2212-type compounds (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2RCu2O8 (R=Pr,Gd)

C. L. Yang; J. H. Shieh; Y. Y. Hsu; H. C. Ku; J. C. Ho

doi:10.1103/PhysRevB.52.10452

Observation of Pr and Gd ordering in the 2212-type compounds (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2RCu2O8 (R=Pr,Gd)

C. L. Yang^*, J. H. Shieh, Y. Y. Hsu, H. C. Ku, J. C. Ho

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Magnetic and calorimetric measurements have been made to reveal a Pr ordering in the (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound which has the (Pb,Cu)-2212-type tetragonal structure with lattice parameters a=3.878(3) and c=27.594(9). The transition occurs at a relatively high TN(Pr) of 9 K. In comparison, isostructural (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2GdCu2O8 exhibits a TN(Gd) of only 2.2 K. The magnetic entropy associated with the Pr ordering has a lower limit value equivalent to about 20% of Rln3 expected for Pr3+ with a quasitriplet ground state, suggesting a more three-dimensional-like process. These results represent the observation of anomalous Pr ordering in the 2212-type cuprate and a complete demonstration of such effects in all two-CuO2-layer m212 (m=1,2,3) systems.

Original language	English
Pages (from-to)	10452-10456
Number of pages	5
Journal	Physical Review B
Volume	52
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.52.10452
Publication status	Published - 1995
Externally published	Yes

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Condensed Matter Physics

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title = "Observation of Pr and Gd ordering in the 2212-type compounds (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2RCu2O8 (R=Pr,Gd)",

abstract = "Magnetic and calorimetric measurements have been made to reveal a Pr ordering in the (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound which has the (Pb,Cu)-2212-type tetragonal structure with lattice parameters a=3.878(3) and c=27.594(9). The transition occurs at a relatively high TN(Pr) of 9 K. In comparison, isostructural (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2GdCu2O8 exhibits a TN(Gd) of only 2.2 K. The magnetic entropy associated with the Pr ordering has a lower limit value equivalent to about 20% of Rln3 expected for Pr3+ with a quasitriplet ground state, suggesting a more three-dimensional-like process. These results represent the observation of anomalous Pr ordering in the 2212-type cuprate and a complete demonstration of such effects in all two-CuO2-layer m212 (m=1,2,3) systems.",

author = "Yang, {C. L.} and Shieh, {J. H.} and Hsu, {Y. Y.} and Ku, {H. C.} and Ho, {J. C.}",

year = "1995",

doi = "10.1103/PhysRevB.52.10452",

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pages = "10452--10456",

journal = "Physical Review B",

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T1 - Observation of Pr and Gd ordering in the 2212-type compounds (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2RCu2O8 (R=Pr,Gd)

AU - Yang, C. L.

AU - Shieh, J. H.

AU - Hsu, Y. Y.

AU - Ku, H. C.

AU - Ho, J. C.

PY - 1995

Y1 - 1995

N2 - Magnetic and calorimetric measurements have been made to reveal a Pr ordering in the (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound which has the (Pb,Cu)-2212-type tetragonal structure with lattice parameters a=3.878(3) and c=27.594(9). The transition occurs at a relatively high TN(Pr) of 9 K. In comparison, isostructural (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2GdCu2O8 exhibits a TN(Gd) of only 2.2 K. The magnetic entropy associated with the Pr ordering has a lower limit value equivalent to about 20% of Rln3 expected for Pr3+ with a quasitriplet ground state, suggesting a more three-dimensional-like process. These results represent the observation of anomalous Pr ordering in the 2212-type cuprate and a complete demonstration of such effects in all two-CuO2-layer m212 (m=1,2,3) systems.

AB - Magnetic and calorimetric measurements have been made to reveal a Pr ordering in the (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound which has the (Pb,Cu)-2212-type tetragonal structure with lattice parameters a=3.878(3) and c=27.594(9). The transition occurs at a relatively high TN(Pr) of 9 K. In comparison, isostructural (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2GdCu2O8 exhibits a TN(Gd) of only 2.2 K. The magnetic entropy associated with the Pr ordering has a lower limit value equivalent to about 20% of Rln3 expected for Pr3+ with a quasitriplet ground state, suggesting a more three-dimensional-like process. These results represent the observation of anomalous Pr ordering in the 2212-type cuprate and a complete demonstration of such effects in all two-CuO2-layer m212 (m=1,2,3) systems.

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Observation of Pr and Gd ordering in the 2212-type compounds (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2RCu2O8 (R=Pr,Gd)

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