Abstract
Elastic and inelastic neutron scattering (ENS and INS) experiments were performed on a single crystal of (Ni0.4Mn0.6)TiO3 (NMTO) to study the spatial correlations and dynamics of spins in the XY-like spin-glass (SG) state. Magnetization measurements reveal signatures of SG behavior in NMTO with a freezing temperature of TSG∼9.1K. The ENS experiments indicate that the intensity of magnetic diffuse scattering starts to increase around 12 K, which is close to TSG. Also, spin-spin correlation lengths (ξ) at 1.5 K are approximately (21±1) and (73±2)Å in the interlayer and the in-plane directions, respectively, demonstrating that magnetic correlations in NMTO exhibit quasi-two-dimensional antiferromagnetic order. In addition, critical exponent (β) is determined to be 0.37±0.02 from the intensity of magnetic diffuse scattering confirms the XY-like SG state of NMTO. INS results show quasielastic neutron scattering (QENS) profiles below TSG. The lifetime of dynamic correlations τ∼/ΓL, obtained from the half-width at half-maximum of the Lorentzian (ΓL) QENS profiles, are approximately (16±1) and (16±2) ps at 10 K for two positions (0.00, 0.00, 1.52) and (0.01, 0.01, 1.50), respectively. Therefore, our experimental findings demonstrate that short-range-ordered antiferromagnetic clusters with short-lived spin correlations are present in the XY-like SG state of NMTO.
| Original language | English |
|---|---|
| Article number | 024425 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 23 2017 |
| Externally published | Yes |
Funding
The author (W.F.P.) would like to thank the Ministry of Science and Technology (MOST) of the Taiwan for financially supporting this research under Contracts No. NSC 102-2112-M032-007-MY3 and No. NSC 102-2632-M032-001-MY3. W.F.P., R.S.S., and S.H.H. are thankful to the NSRRC, Taiwan for providing financial assistance to visit SIKA, ANSTO, Australia to collect the neutron scattering data under proposals No. N-2014-3-005 and No. N-2015-1-016. W.F.P. also acknowledges the support of SIKA-Neutron Program of MOST, Taiwan and staffs of ANSTO, Australia. H.T. and T.K. were in part supported by JSPS KAKENHI Grant No. 24244058. R.S.S. is thankful to Department of Science and Technology (DST), India for DST INSPIRE Faculty award (DST/INSPIRE/04/2015/002300).