Electronic and magnetic structures that hinder the superconducting state in the collapsed phase of $$\mathrm{SrCr_2}$$ $$\mathrm{As_2}$$
[1];
[2];
[3];
[4];
[5];
[6]
- Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS)
- Universidade Federal de Lavras, Minas Gerais (Brazil)
- Federal Univ. of Jataí, Goiás (Brazil)
- Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); European XFEL, Schenefeld (Germany)
- Ames Lab., and Iowa State Univ., Ames, IA (United States); Ruhr Univ., Bochum (Germany)
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
The lack of superconductivity in the family of materials $$AB_2$$ $$\mathrm{As_2}$$ ($$A$$ = $$\mathrm{Sr, Ba}$$ and $$B$$ = $$\mathrm{Cr, Mn}$$) under doping or pressure is an intriguing issue, considering the resemblance of these materials to their cousin materials and superconductors $$\mathrm{(Ba, Sr) Fe_2}$$ $$\mathrm{As_2}$$. In this context, the suppression of magnetism together with the presence of electron and hole pockets in the Brillouin zone seem to be fundamental ingredients to explain superconductivity. In this paper, we report a tetragonal to collapsed-tetragonal phase transition in $$\mathrm{SrCr_2}$$ $$\mathrm{As_2}$$ under high pressure with the appearance of hole and electron pockets in the Brillouin zone. In this collapsed-tetragonal phase, a residual local magnetic moment in the Cr-ion site and a finite global magnetic energy are derived. Importantly, this scenario would suggest why superconductivity is prevented in this compound. Our observations were obtained from the analysis of synchrotron x-ray diffraction measurements of polycrystalline samples of $$\mathrm{SrCr_2}$$ $$\mathrm{As_2}$$, and using first-principles simulations, under pressures $$P$$ in the range $$\mathrm{1.4}$$ $$\mathrm{GPa}$$ < $$P$$ < $$\mathrm{20 GPa}$$ at room temperature.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 2216914
- Alternate ID(s):
- OSTI ID: 2205110
- Report Number(s):
- IS-J--11180
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 19 Vol. 108; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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