Superconducting and magnetic phase diagram of and at high pressure
Journal Article
·
· Physical Review B
- Univ. of Florida, Gainesville, FL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Zhejiang Univ., Hangzhou (China)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Alabama at Birmingham, Birmingham, AL (United States)
The recently discovered (Rb,Cs)EuFe4As4 compounds exhibit an unusual combination of superconductivity (Tc~35K) and ferromagnetism (Tm~15K). We have performed a series of x-ray diffraction, ac magnetic susceptibility, dc magnetization, and electrical resistivity measurements on both RbEuFe4As4 and CsEuFe4As4 to pressures as high as ~30GPa. We find that the superconductivity onset is suppressed monotonically by pressure while the magnetic transition is enhanced at initial rates of dTm/dP~1.7K/GPa and 1.5K/GPa for RbEuFe4As4 and CsEuFe4As4, respectively. Near 7 GPa, Tc onset and Tm become comparable. At higher pressures, signatures of bulk superconductivity gradually disappear. Room-temperature x-ray diffraction measurements suggest the onset of a transition from tetragonal (T) to a half-collapsed-tetragonal (hcT) phase at ~10GPa (RbEuFe4As4) and ~12GPa (CsEuFe4As4). In conclusion, the ability to tune Tc and Tm into coincidence with relatively modest pressures highlights (Rb,Cs)EuFe4As4 compounds as ideal systems to study the interplay of superconductivity and ferromagnetism.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- German Research Foundation (DFG); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357; AC52-07NA27344; NA0002928
- OSTI ID:
- 1471592
- Alternate ID(s):
- OSTI ID: 1525747
OSTI ID: 1461595
- Report Number(s):
- LLNL-JRNL--755663; 146039
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 1 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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