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Title: Iridium valence variation and carrier sign tuning in ( Ca , Ba ) x La 2 x CuIrO 6 double perovskites

Journal Article · · Physical Review Materials
 [1];  [1];  [2];  [2];  [3];  [4]; ORCiD logo [4]; ORCiD logo [1]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Univ. of California, Santa Cruz, CA (United States)

Here, we report the structure and properties of ( Ca , Ba ) x La 2 x CuIrO 6 . The rock-salt double perovskite structure goes through a P 1 ¯ to P 2 1 / n phase transition with increasing Ba content but not with Ca content. In both cases, the Ir ion is oxidized from 4 + to 5 + with increasing substitution. Transport and magnetic properties measurements reveal that all compositions are insulating with hysteretic spin-freezing magnetic behavior. Seebeck coefficient measurements reveal a large thermopower change from + 176 μ V /K in La 2 CuIrO 6 to 223 μ V /K with increasing Ba content in Ba x La 2 x CuIrO 6 . This behavior is modeled well by the Heikes formula for correlated hopping conduction. ( Ca , Ba ) x La 2 x CuIrO 6 provides a model system for investigations of other systems with similar carrier sign tuning, with applications toward semiconductors and thermoelectric materials.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; SC0017862; DMR-1508527
OSTI ID:
1798204
Journal Information:
Physical Review Materials, Vol. 5, Issue 5; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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