Pressure-induced structural changes in superconducting HgBa{sub 2}Ca{sub n-1}Cu{sub n}O{sub 2n+2delta} (n=1,2,3) compounds.
Journal Article
·
· Physica C
OSTI ID:937694
The crystal structures of superconducting HgBa{sub 2}CuO{sub 4+{delta}} and HgBa{sub 2}CaCu{sub 2}O{sub 6+{delta}} have been investigated with a pressure up to 0.6 GPa and HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} to 9.2 GPa by neutron powder diffraction. The compressibility along the c-axis is nearly the same for the three compounds and up to two times larger than the compressibility along the a-axis. The one-layer compound, HgBa{sub 2}CuO{sub 4+{delta}}, shows the largest a-axis compressibility, while HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 4+{delta}} shows the smallest compressibility. The bond compressibilities of HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 4+{delta}} and HgBa{sub 2}CaCu{sub 2}O{sub 6+{delta}} are significantly different from HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} bond compressibilities. In the one- and two-layer compounds the largest bond compressibility was the Cu-O{sub 2} (apical) bond distance, while for the three-layer compound it was the Hg-O{sub 2} bond distance.
- Research Organization:
- Argonne National Laboratory (ANL)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937694
- Report Number(s):
- ANL/MSD/JA-12115
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: 1-2 ; 1995 Vol. 221; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
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