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Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [3];  [2]
  1. Technische Univ. Wien (Austria)
  2. Univ. of Texas at El Paso, TX (United States)
  3. Texas A & M Univ., College Station, TX (United States)
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  5. Univ. of Zagreb (Croatia)
  6. New Mexico State Univ., Las Cruces, NM (United States)
In this work, the hyperkagome lattice of Gd spins in a garnet compound, Gd3CrGa4O12, is studied using bulk measurements and density functional computations, and the observation of large magnetocaloric effect corresponding to an entropy change, ΔSm = 45 Jkg-1K-1 (≈ 45 J mol-1K-1) at 2 K, 8 T is reported. Though the compound defies long-range magnetic order down to 0.4 K, a broad feature below 10 K is observed in the specific heat with two low temperature anomalies at T* ≈ 0.7 K and TS ≈ 2.45 K. The anomaly at T* is reminiscent of one in Gd3Ga5O12, where it is related to the development of a complex magnetic phase, whereas the TS-peak is accounted for by a multilevel Schottky-like model. The spin-lattice relaxation times studied by nuclear magnetic resonance experiments show that the relaxation is dominated by the magnetic fluctuations in Cr which has a longer relaxation time compared to that of the garnet, Lu3CrGa4O12 containing a nonmagnetic rare earth. Our first-principles density functional theory calculations agree well with the experimental results and support short-range magnetic order in the Gd-sublattice and antiferromagnetism in the Cr-sublattice. The importance of spin fluctuations and short-range order in the rare earth and transition metal lattices in garnets resulting in large magnetocaloric effect is brought out through this work.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
Croatian Science Foundation; European Regional Development Fund; Extreme Science and Engineering Discovery Environment (XSEDE); Robert A. Welch Foundation; Swiss National Science Foundation (SNSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1687369
Alternate ID(s):
OSTI ID: 1759037
Report Number(s):
INL/JOU--19-56395-Rev000
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 20 Vol. 59; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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