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Short-range spin freezing in the double trillium lattice spin-liquid candidate KSrFe2⁢(PO4)3 revealed via 31P NMR

Journal Article · · Physical Review. B
DOI:https://doi.org/10.1103/k3lw-2567· OSTI ID:3007648
 [1];  [2];  [3];  [4];  [2]
  1. Ames Lab., and Iowa State Univ., Ames, IA (United States); Indian Institute of Science Education and Research, Thiruvananthapuram (India)
  2. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  3. Univ. of Leipzig (Germany)
  4. Indian Institute of Science Education and Research, Thiruvananthapuram (India)
+ Show Author Affiliations
A comprehensive 31P nuclear magnetic resonance (NMR) study, combined with thermodynamic measurements and first-principles band-structure calculations, has been conducted to explore the ground state of the 𝑆=5/2 double trillium lattice antiferromagnet KSrFe2⁢(PO4)3. Our experimental results indicate that the magnetic ground state is neither a conventional three-dimensional (3D) long-range order (LRO) nor a pure gapless spin-liquid state, as conjectured previously [Boya et al., APL Mater. 10, 101103 (2022)]. Specifically, the observation of a nearly field-independent NMR linewidth below 𝑇* = (3.5 ± 0.4)⁢ K, and a significant enhancement of spin-spin relaxation rate 1/𝑇2 below 2⁢𝑇* (where 𝑇* is the characteristic temperature identified from the magnetic susceptibility), indicate a complex magnetic ground state where spin freezing coexists with persistent dynamics. Furthermore, we argue that the lack of magnetic LRO and the persistence of strong magnetic fluctuations in KSrFe2⁢(PO4)3 are unlikely to originate from intersite K/Sr disorder, rather they arise due to intrinsic magnetic frustration. In conclusion, our findings position KSrFe2⁢(PO4)3 into a broader family of geometrically frustrated magnets characterized by coexisting spin freezing and pronounced antiferromagnetic fluctuations, marking it as a promising platform for investigating exotic phenomena in 3D frustrated magnets.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
Department of Science and Technology, Ministry of Science and Technology, India; Fulbright-Nehru Doctoral Research Fellowship Award; Science and Engineering Research Board (SERB), India; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
3007648
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 112; ISSN 2469-9969; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Data for Short-range Spin Freezing State in the Double Trillium Lattice Spin-Liquid Candidate KSrFe2(PO4)3 Revealed via 31P NMR dataset January 2025

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Related Subjects

Exotic phases of matter
Frustrated magnetism
Magnetic insulators
Nuclear magnetic resonance
Spin liquid