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Growth and characterization of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ crystals

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [6];  [6];  [6];  [7]
  1. Peking Univ., Beijing (China); DOE/OSTI
  2. Peking Univ., Beijing (China); Univ. of Michigan, Ann Arbor, MI (United States)
  3. Peking Univ., Beijing (China); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Peking Univ., Beijing (China)
  5. Peking Univ., Beijing (China); Columbia Univ., New York, NY (United States)
  6. Univ. of Minnesota, Minneapolis, MN (United States)
  7. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
We report the successful growth of sizable crystals of the cuprate superconductors HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ. These compounds are well known for their high optimal superconducting critical temperatures of Tc = 128 K and 134 K at ambient pressure, respectively, and for their challenging synthesis. Using a conventional quartz-tube encapsulation method and a two-layer encapsulation method that utilizes custom-built high-pressure furnaces, we are able to grow single crystals with linear dimensions up to several millimeters parallel to the CuO2 planes. Extended postgrowth annealing is shown to lead to sharp superconducting transitions, indicative of high macroscopic homogeneity. X-ray diffraction and polarized Raman spectroscopy are identified as viable nondestructive methods to help separate the two compounds from synthesis products, as the latter often contain intergrowths of the former. Furthermore, our work helps to remove obstacles toward the study of these model cuprate systems with experimental probes that require sizable high-quality crystals.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0016371
OSTI ID:
1612519
Alternate ID(s):
OSTI ID: 1484966
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 12 Vol. 2; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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