APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017;
New Orleans, Louisiana
Session A22: Nano-scale Perspectives on Phase Transitions in Correlated Oxides
8:00 AM–11:00 AM,
Monday, March 13, 2017
Room: New Orleans Theater A
Sponsoring
Unit:
DCMP
Chair: Dmitri Basov, Columbia University
Abstract ID: BAPS.2017.MAR.A22.2
Abstract: A22.00002 : Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning.*
8:36 AM–9:12 AM
Preview Abstract
Abstract
Author:
Yasutomo Uemura
(Columbia University)
RENiO$_{\mathrm{3}}$ (RE $=$ rare-earth element) and
V$_{\mathrm{2}}$O$_{\mathrm{3}}$ are archetypal Mott insulator systems. When
tuned by chemical substitution (RENiO$_{\mathrm{3}})$ or hydrostatic
pressure (V$_{\mathrm{2}}$O$_{\mathrm{3}})$, they exhibit a quantum phase
transition (QPT) between an antiferromagnetic Mott insulating state and a
paramagnetic metallic state. We demonstrate through muon spin
relaxation/rotation ($\mu $SR) experiments that the QPT in
RENiO$_{\mathrm{3}}$ and V$_{\mathrm{2}}$O$_{\mathrm{3}}$ is ?rst order: the
magnetically ordered volume fraction decreases to zero at the QPT, resulting
in a broad region of intrinsic phase separation, while the ordered magnetic
moment retains its full value until it is suddenly destroyed at the QPT. [1]
These two cases correspond to the band-width tuning of Mott transitions, and
also associated with structural phase transitions,
Volume evolutions of antiferromagnetic transition from $\mu $SR will be
compared to those of structure by x-ray and metallicity by nano optics, in
first-order thermal Mott transition in a V$_{\mathrm{2}}$O$_{\mathrm{3}}$
film at ambient pressure. These results will be compared to the process of
destruction of magnetic order in another Mott transition system
Ba(Co,Ni)S$_{\mathrm{2}}$ in ``filling control'' without structural
transition, and in parent compounds of high-Tc cuprates and Fe-based
superconductors. We will also discuss roles of first-order quantum
transition in generating soft modes relevant to magnetic resonance mode in
unconventional superconductors [2].
Work performed in collaboration with the groups of: J.A. Alonso (Madrid), H.
Kageyama (Kyoto). E. Morenzoni (PSI), G.M. Luke (McMaster), C.Q. Jin (IOP
Beijing), F.L. Ning (Zhejian), S.J.L. Billinge (Columbia), S. Shamoto, W.
Higemoto (JAEA), A. Fujimori (Tokyo), A. Gauzzi (Paris), R. de Renzi
(Parma), G. Kotliar (Rutgers), M. Imada (Tokyo), D. Basov (UCSD), I,
Schuller (UCSD).
[1] B.A. Frandsen et al., Nature Communications 7 (2016) 12519.
[2] Y.J. Uemura, Nature Materials 8 (2009) 253-255.
*supported by NSF DMR-1610633 and DMR-1436095 (DMREF)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2017.MAR.A22.2