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Title: Nematic Fluctuations in the Non-Superconducting Iron Pnictide BaFe1.9-xNi0.1CrxAs2

Journal Article · · Frontiers in Physics
 [1];  [2];  [3];  [1];  [1];  [4];  [4];  [3];  [5];  [6];  [6];  [7];  [8];  [8];  [9];  [9];  [10];  [11];  [12]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); University of Chinese Academy of Sciences, Beijing (China)
  2. Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
  3. Sun Yat-Sen Univ., Guangzhou (China)
  4. Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia). Australian Centre for Neutron Scattering
  5. Technische Univ. Munchen, Garching (Germany). Dept. Physik
  6. Comprehensive Research Organization for Science and Society, Tokai (Japan)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  9. Rice Univ., Houston, TX (United States)
  10. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  11. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
  12. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Laboratory, Guangdong (China)
+ Show Author Affiliations

The main driven force of the electronic nematic phase in iron-based superconductors is still under debate. Here, we report a comprehensive study on the nematic fluctuations in a non-superconducting iron pnictide system BaFe1.9-xNi0.1CrxAs2 by electronic transport, angle-resolved photoemission spectroscopy (ARPES), and inelastic neutron scattering (INS) measurements. Previous neutron diffraction and transport measurements suggested that the collinear antiferromagnetism persists to x = 0.8, with similar Néel temperature TN and structural transition temperature Ts around 32 K, but the charge carriers change from electron type to hole type around x = 0.5. In this study, we have found that the in-plane resistivity anisotropy also highly depends on the Cr dopings and the type of charge carriers. While ARPES measurements suggest possibly weak orbital anisotropy onset near Ts for both x = 0.05 and x = 0.5 compounds, INS experiments reveal clearly different onset temperatures of low-energy spin excitation anisotropy, which is likely related to the energy scale of spin nematicity. These results suggest that the interplay between the local spins on Fe atoms and the itinerant electrons on Fermi surfaces is crucial to the nematic fluctuations of iron pnictides, where the orbital degree of freedom may behave differently from the spin degree of freedom, and the transport properties are intimately related to the spin dynamics.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research and Development Program of China; National Natural Science Foundation of China; Chinese Academy of Sciences KC Wong Education Foundation; Beijing Natural Science Foundation; Guangdong Basic and Applied Basic Research Foundation; National Key Research and Development Program of China; Robert A. Welch Foundation
Grant/Contract Number:
AC02-05CH11231; SC0012311
OSTI ID:
1877045
Journal Information:
Frontiers in Physics, Journal Name: Frontiers in Physics Vol. 10; ISSN 2296-424X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

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iron-based superconductors
electronic nematic phase
nematic fluctuations
resistivity
spin excitations
orbital ordering
neutron scattering