Structural, magnetic, and crystalline electric-field effects in single crystals of Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
- Department of Physics, Indian Institute of Technology, Madras 600036 (India)
- Department of Physics, University of Oxford, Clarendon Laboratory, Oxford, 0X13PU (England)
We report here structural and directional magnetic susceptibility measurements on single crystals of Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({ital x}=1.0, {delta}=1, 0.11; {ital x}=0.7, {delta}=0; and {ital x}=0.42, {delta}=0.22). The space group of PrBa{sub 2}Cu{sub 3}O{sub 6} (Pr-O6) and Y{sub 0.58}Pr{sub 0.42}Ba{sub 2}Cu{sub 3}O{sub 6.78} (Pr 0.42-O7) were found to be {ital P}4/{ital mmm} and that of PrBa{sub 2}Cu{sub 3}O{sub 6.89} (Pr-O7) was found to be {ital Pmmm}. Also, Pr-O7 was found to be weakly orthorhombic. Directional, magnetic susceptibility measurements in the temperature range 2{endash}300 K revealed a clear peaking in the paramagnetic anisotropy of Pr-O7 around 17 K, and {chi}{sub {ital c}}{approx_gt}{chi}{sub {ital a},{ital b}} at all temperatures. However for Y{sub 0.3}Pr{sub 0.7}Ba{sub 2}Cu{sub 3}O{sub 7} (Pr0.7-O7) and Pr0.42-O7, {chi}{sub {ital c}}{approx_gt}{chi}{sub {ital a},{ital b}} at room temperature and {chi}{sub {ital c}}{lt}{chi}{sub {ital a},{ital b}} for temperatures below 110 and 60 K, respectively. The magnetic susceptibilities have been analyzed in the light of crystalline electric-field effects considering {ital J} mixing of all the thirteen multiplets. Intermediate coupled wave functions have also been used in the calculations. Crystal-field interaction is found to be stronger in the case of Pr-O7 compared to Pr-O6 which is also evident from a shorter Pr-O bond length in the case of Pr-O7 than in Pr-O6. A best set of eigenvalues and eigenfunctions has been determined and these are discussed and compared with inelastic neutron scattering data. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 282041
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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