Itinerant Antiferromagnetism in RuO$_{2}$

Berlijn, T

Snijders, PC

Delaire, O

Zhou, H-D

Maier, TA

Cao, H-B

Chi, S-X

Matsuda, M

Wang, Y

Koehler, MR

Kent, PRC

Weitering, HH

2017-02-23T22:01:16Z

2017-02-23T22:01:16Z

2017-02-23

Bulk rutile RuO$_2$ has long been considered a Pauli paramagnet. Here we report that RuO$_2$ exhibits a hitherto undetected lattice distortion below approximately 900 K. The distortion is accompanied by antiferromagnetic order up to at least 300 K with a small room temperature magnetic moment of approximately 0.05 $\mu_B$ as evidenced by polarized neutron diffraction. Density functional theory plus $U$ (DFT+$U$) calculations indicate that antiferromagnetism is favored even for small values of the Hubbard $U$ of the order of 1 eV. The antiferromagnetism may be traced to a Fermi surface instability, lifting the band degeneracy imposed by the rutile crystal field. The combination of high N'eel temperature and small itinerant moments make RuO$_2$ unique among ruthenate compounds and among oxide materials in general.

http://arxiv.org/abs/1612.09589v1

https://hdl.handle.net/10161/13673

American Physical Society (APS)

PRL

10.1103/PhysRevLett.118.077201

cond-mat.str-el

cond-mat.str-el

Itinerant Antiferromagnetism in RuO$_{2}$

Journal article

Delaire, O|0000-0003-1230-2834

http://arxiv.org/abs/1612.09589v1

077201

accepted in Physical Review Letters

Duke

Mechanical Engineering and Materials Science

Physics

Pratt School of Engineering

Trinity College of Arts & Sciences

http://dx.doi.org/10.1103/PhysRevLett.118.077201

118