Structural and magnetic phase transitions near optimal superconductivity in BaFe2(As1-xPx)2
- Chinese Academy of Sciences (CAS), Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Canadian Neutron Beam Centre, Chalk River, ON (Canada)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Technische Univ. Munchen, Garching (Germany)
- Max-Planck-Institut fur Festkorperforschung, Stuttgart (Germany); Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz, Garching (Germany)
- Renmin Univ. of China, Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Rice Univ., Houston, TX (United States)
In this study, we use nuclear magnetic resonance (NMR), high-resolution x-ray and neutron scattering to study structural and magnetic phase transitions in phosphorus-doped BaFe2(As1-xPx)2. Thus, previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at x = 0.3. However, we show that the tetragonal-to-orthorhombic structural (Ts) and paramagnetic to antiferromagnetic (AF, TN) transitions in BaFe2(As1-xPx)2 are always coupled and approach to TN ≈ Ts ≥ Tc (≈ 29 K) for x = 0.29 before vanishing abruptly for x ≥ 0.3. These results suggest that AF order in BaFe2(As1-xPx)2 disappears in a weakly first order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 2012CB821400; 2011CBA00110; 2015CB921302; 11374011; 91221303; 11222433; 11374364; SPRP-B: XDB07020300; DMR1362219; C-1839; AC02-06CH11357; AC02-07CH11358
- OSTI ID:
- 1227296
- Alternate ID(s):
- OSTI ID: 1180557
- Report Number(s):
- IS-J-8657; PRLTAO
- Journal Information:
- Physical Review Letters, Vol. 114, Issue 15; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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