Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1-xPx)2

Pelliciari, Jonathan; Ishii, Kenji; Huang, Yaobo; Dantz, Marcus; Lu, Xingye; Olalde-Velasco, Paul; Strocov, Vladimir N.; Kasahara, Shigeru; Xing, Lingyi; Wang, Xiancheng; Jin, Changqing; Matsuda, Yuji; Shibauchi, Takasada; Das, Tanmoy; Schmitt, Thorsten

doi:10.1038/s42005-019-0236-3

Title: Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe₂(As_1-xP_x)₂

Journal Article · Thu Nov 07 00:00:00 EST 2019 · Communications Physics

DOI:https://doi.org/10.1038/s42005-019-0236-3· OSTI ID:1825727

Pelliciari, Jonathan ^[1];

^[2];

^[3]; Dantz, Marcus ^[4];

^[4]; Olalde-Velasco, Paul ^[5]; Strocov, Vladimir N. ^[4];

^[6]; Xing, Lingyi ^[7]; Wang, Xiancheng ^[7]; Jin, Changqing ^[8];

^[6];

^[9]; Das, Tanmoy ^[10]; Schmitt, Thorsten ^[4]

Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
National Institutes for Quantum and Radiological Science and Technology, Sayo, Hyogo (Japan)
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source; Chinese Academy of Sciences (CAS), Beijing (China)
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source; Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Kyoto Univ. (Japan)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center for Quantum Matters, Beijing (China)
Univ. of Tokyo (Japan)
Indian Institute of Science, Bangalore, Karnataka (India)

Unconventional superconductivity arises at the border between the strong coupling regime with local magnetic moments and the weak coupling regime with itinerant electrons, and stems from the physics of criticality that dissects the two. Unveiling the nature of the quasiparticles close to quantum criticality is fundamental to understand the phase diagram of quantum materials. Here, using resonant inelastic x-ray scattering (RIXS) and Fe-K_β emission spectroscopy (XES), we visualize the coexistence and evolution of local magnetic moments and collective spin excitations across the superconducting dome in isovalently-doped BaFe₂(As_1-xP_x)₂ (0.00 ≤ x ≤0.52). Collective magnetic excitations resolved by RIXS are gradually hardened, whereas XES reveals a strong suppression of the local magnetic moment upon doping. This relationship is captured by an intermediate coupling theory, explicitly accounting for the partially localized and itinerant nature of the electrons in Fe pnictides. Finally, our work identifies a local-itinerant spin fluctuations channel through which the local moments transfer spin excitations to the particle-hole (paramagnons) continuum across the superconducting dome.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Paul Scherrer Institut; Swiss National Science Foundation (SNSF); Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan

Grant/Contract Number:: SC0012704; CRSII2_141962; CRSII2_160765; 200021L_141325; 290605

OSTI ID:: 1825727

Report Number(s):: BNL-222232-2021-JAAM

Journal Information:: Communications Physics, Vol. 2, Issue 1; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1-xPx)2

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Title: Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe₂(As_1-xP_x)₂