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Slow spin dynamics and quantum tunneling of magnetization in the dipolar antiferromagnet DyScO3

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4]
  1. Technische Univ. Dresden (Germany)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Technologies Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Here, we present a comprehensive study of static and dynamic magnetic properties in the Ising-like dipolar antiferromagnet (AFM) DyScO3 by means of DC and AC magnetization measurements supported by classical Monte Carlo calculations. Our AC-susceptibility data show that the magnetic dynamics exhibit a clear crossover from an Arrhenius-like regime to quantum tunneling of magnetization (QTM) at T*=10K. Below TN=3.2K, DyScO3 orders in an antiferromagnetic GxAy-type magnetic structure and the magnetization dynamics slow down to the minute timescale. The low-temperature magnetization curves exhibit complex hysteretic behavior, which depends strongly on the magnetic field sweep rate. We demonstrate that the low-field anomalies on the magnetization curve are related to the metamagnetic transition, while the hysteresis at higher fields is induced by a strong magnetocaloric effect. Our theoretical calculations, which take into account dipolar interaction between Dy3+ moments, reproduce essential features of the magnetic behavior of DyScO3. We demonstrate that DyScO3 represents a rare example of an inorganic compound, which exhibits QTM at a single-ion level and magnetic order due to classical dipolar interaction.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
European Union (EU); German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1890276
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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