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Title: Microscopic phase diagram of LaFeAsO single crystals under pressure

Journal Article · · Physical Review B
 [1];  [2];  [1];  [1];  [3];  [3];  [4];  [3];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Geology; Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Dresden Univ. of Technology (Germany). Inst. of Solid State and Materials Physics
  4. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)

We investigated a LaFeAsO single crystal by means of synchrotron Mössbauer spectroscopy under pressure up to 7.5 GPa and down to 13 K and provide a microscopic phase diagram. We found a continuous suppression of the magnetic hyperfine field with increasing pressure and it completely vanishes at ~7.5 GPa which is in contrast to the behavior in polycrystalline samples where the magnetic order vanishes at ~ 20 GPa. The different behavior of the polycrystalline samples might be due to As-vacancies. Our results are in qualitative agreement with density functional theory calculations where a reduction of the magnetic moment with increasing pressure was found. Here, we found that among different samples the magnetic phase transition temperature as well as the low-temperature magnetic hyperfine field decrease with increasing unit cell volume.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
German Research Foundation (DFG); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1493702
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 17 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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