Signatures of spin-liquid state in a 3D frustrated lattice compound KSrFe2(PO4)3 with S = 5/2

Author:

Boya K.1,Nam K.2,Kargeti K.3,Jain A.45ORCID,Kumar R.6,Panda S. K.3,Yusuf S. M.45ORCID,Paulose P. L.6,Voma U. K.1,Kermarrec E.7,Kim Kee Hoon2ORCID,Koteswararao B.1ORCID

Affiliation:

1. Department of Physics, Indian Institute of Technology Tirupati, Tirupati 517 506, India

2. Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul 151-747, Republic of Korea

3. Department of Physics, Bennett University, Greater Noida 201310, Uttar Pradesh, India

4. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

5. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India

6. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India

7. Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France

Abstract

A quantum spin-liquid is a spin disordered state of matter in which spins are strongly correlated and highly entangled with low-energy excitations. It has been often found in two-dimensional S = ½, highly frustrated spin networks but rarely observed in three-dimensional (3D) frustrated quantum magnets. Here, KSrFe2(PO4)3, forming a complicated 3D frustrated lattice with a spin moment S = 5/2, is investigated by thermodynamic, neutron diffraction measurements and electronic structure calculations. Despite the relatively sizable Curie–Weiss temperature θCW = −70 K, a conventional magnetic long-range order is confirmed to be absent down to 0.19 K. The magnetic heat capacity data follow the power-law behavior at the lowest temperature region, supporting gapless excitations in a 3D spin-liquid state. Strong geometrical spin frustration responsible for the spin-liquid feature is understood as originating from the almost comparable five competing nearest-neighbor antiferromagnetic exchange interactions, which form the complicated 3D frustrated spin network. All these results suggest that the compound KSrFe2(PO4)3, representing a unique 3D spin frustrated network, could be a rare example of forming a gapless spin-liquid state even with a large spin moment of S = 5/2.

Funder

National Research Foundation of Korea

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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