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Frustrated magnetism from local moments in FeSe

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Stanford Univ., Stanford, CA (United States); Stanford Univ., Menlo Park, CA (United States)
  2. Stanford Univ., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States); Harvard Univ., Cambridge, MA (United States)
  3. Stanford Univ., Menlo Park, CA (United States); Univ. of North Dakota, Grand Forks, ND (United States)
  4. Walther Meissner Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
  5. Walther Meissner Institut, Garching (Germany)
  6. Stanford Univ., Menlo Park, CA (United States)
We investigate properties of a spin-1 Heisenberg model with extended and biquadratic interactions, which captures crucial aspects of the low energy physics in FeSe. While we show that the model exhibits a rich phase diagram with four different magnetic ordering tendencies, we identify a parameter regime with strong competition between Néel, staggered dimer, and stripelike magnetic fluctuations, accounting for the physical properties of FeSe. We evaluate the spin and Raman responses using exact diagonalization. Through comparison with experiments we find enhanced magnetic frustration between Néel and collinear stripe ordering tendencies, which increases with increasing temperature. As a result, the explanation of these spectral behaviors with this frustrated spin model supports the idea of local spin interactions in FeSe.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1526705
Alternate ID(s):
OSTI ID: 1501698
OSTI ID: 1543136
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 12 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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