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Observation of long-range magnetic ordering in pyrohafnateNd2Hf2O7: A neutron diffraction study
- Source :
- Physical Review B. 92
- Publication Year :
- 2015
- Publisher :
- American Physical Society (APS), 2015.
-
Abstract
- We have investigated the physical properties of a pyrochlore hafnate Nd2Hf2O7 using ac magnetic susceptibility \chi_ac(T), dc magnetic susceptibility \chi(T), isothermal magnetization M(H) and heat capacity C_p(T) measurements, and determined the magnetic ground state by neutron powder diffraction study. An upturn is observed below 6 K in C_p(T)/T, however both C_p(T) and \chi(T) do not show any clear anomaly down to 2 K. The \chi_ac(T) shows a well pronounced anomaly indicating an antiferromagnetic transition at T_N = 0.55 K. The long range antiferromagnetic ordering is confirmed by neutron diffraction. The refinement of neutron diffraction pattern reveals an all-in/all-out antiferromagnetic structure, where for successive tetrahedra, the four Nd3+ magnetic moments point alternatively all-into or all-out-of the tetrahedron, with an ordering wavevector k = (0, 0, 0) and an ordered state magnetic moment of m = 0.62(1) \mu_B/Nd at 0.1 K. The ordered moment is strongly reduced reflecting strong quantum fluctuations in ordered state.
- Subjects :
- Physics
Magnetic moment
Condensed matter physics
Neutron diffraction
Pyrochlore
engineering.material
Condensed Matter Physics
Heat capacity
Magnetic susceptibility
Electronic, Optical and Magnetic Materials
engineering
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
Anomaly (physics)
Ground state
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 92
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........4d8e0a41529e2da3145b3d2e5d15756a