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Deformed spin- 12 square lattice in antiferromagnetic NaZnVOPO4 ( HPO4 )

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [2];  [4];  [1]
  1. Indian Inst. of Science Education and Research, Thiruvananthapuram (India)
  2. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  3. Helmholtz-Zentrum Dresden-Rossendorf, (Germany). Dresden High Magnetic Field Lab. (HLD-EMFL)
  4. Univ. of Leipzig (Germany)
+ Show Author Affiliations
In this work, we report the structural and magnetic properties of a new spin-$$\frac{1}{2}$$ antiferromagnet NaZnVOPO4(HPO4) studied via x-ray diffraction, magnetic susceptibility, high-field magnetization, specific heat, and 31P nuclear magnetic resonance (NMR) measurements, as well as density-functional band-structure calculations. While thermodynamic properties of this compound are well described by the J1 – J2 square-lattice model, ab initio calculations suggest a significant deformation of the spin lattice. From fits to the magnetic susceptibility we determine the averaged nearest-neighbor and second-neighbor exchange couplings of $$\bar{J}$$1 ≃ – 1.3 K and $$\bar{J}$$2 ≃ 5.6 K , respectively, resulting in the effective frustration ratio α = $$\bar{J}$$2 – $$\bar{J}$$1 ≃ – 4.3 that implies columnar antiferromagnetic order as the ground state. Experimental saturation field of 15.3 T is consistent with these estimates if 20% spatial anisotropy in J1 is taken into account. Specific heat data signal the onset of a magnetic long-range order at TN ≃ 2.1 K , which is further supported by a sharp peak in the NMR spin-lattice relaxation rate. The NMR spectra mark the superposition of two P lines due to two nonequivalent P sites where the broad line with the strong hyperfine coupling and short T1 is identified as the P(1) site located within the magnetic planes, while the narrow line with the weak hyperfine coupling and long T1 is designated as the P(2) site located between the planes.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
Science and Engineering Research Board (SERB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1886215
Report Number(s):
IS-J 10,877; CRG/2019/000960
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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