Publication
Article Metrics
Citations
Online attention
Magnetically induced metal-insulator transition in Pb2CaOsO6
DOI:
10.1103/PhysRevB.102.214409
Authors:
Henrik
Jacobsen
(University of Oxford; Paul Scherrer Institute)
,
Hai L.
Feng
(National Institute for Materials Science; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
,
Andrew J.
Princep
(University of Oxford; ISIS Pulsed Neutron and Muon Source)
,
Marein C.
Rahn
(University of Oxford)
,
Yanfeng
Guo
(ShanghaiTech University)
,
Jie
Chen
(National Institute for Materials Science, Japan)
,
Yoshitaka
Matsushita
(National Institute for Materials Science, Japan)
,
Yoshihiro
Tsujimoto
(National Institute for Materials Science, Japan)
,
Masahiro
Nagao
(Nagoya University)
,
Dmitry
Khalyavin
(ISIS Pulsed Neutron and Muon Source)
,
Pascal
Manuel
(ISIS Pulsed Neutron and Muon Source)
,
Claire A.
Murray
(Diamond Light Source)
,
Christian
Donnerer
(University College London)
,
James G.
Vale
(University College London)
,
Marco
Moretti Sala
(European Synchrotron Radiation Facility)
,
Kazunari
Yamaura
(National Institute for Materials Science, Japan)
,
Andrew T.
Boothroyd
(University of Oxford)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review B
, VOL 102
State:
Published (Approved)
Published:
December 2020
Diamond Proposal Number(s):
9839
Abstract: We report on the structural, magnetic, and electronic properties of two new double-perovskites synthesized under high pressure, Pb 2 CaOsO 6 and Pb 2 ZnOsO 6 . Upon cooling below 80 K, Pb 2 CaOsO 6 simultaneously undergoes a metal-to-insulator transition and develops antiferromagnetic order. Pb 2 ZnOsO 6 , on the other hand, remains a paramagnetic metal down to 2 K. The key difference between the two compounds lies in their crystal structures. The Os atoms in Pb 2 ZnOsO 6 are arranged on an approximately face-centered cubic lattice with strong antiferromagnetic nearest-neighbor exchange couplings. The geometrical frustration inherent to this lattice prevents magnetic order from forming down to the lowest temperatures. In contrast, the unit cell of Pb 2 CaOsO 6 is heavily distorted up to at least 500 K including antiferroelectriclike displacements of the Pb and O atoms despite metallic conductivity above 80 K. This distortion relieves the magnetic frustration, facilitating magnetic order which, in turn, drives the metal-insulator transition. Our results suggest that the phase transition in Pb 2 CaOsO 6 is spin driven and could be a rare example of a Slater transition.
Journal Keywords: Antiferroelectricity; Antiferromagnetism; Crystal structure; Magnetic phase transitions; Metal-insulator transition
Subject Areas:
Materials,
Physics
Instruments:
I11-High Resolution Powder Diffraction
Other Facilities: ID20 at ESRF; ISIS