Long-range order and spin-liquid states of polycrystalline Tb2+xTi2-xO7+y

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.87.060408· OSTI ID:1096338

Taniguchi, T ^[1]; Kadowaki, Hiroaki ^[2]; Takatsu, Hiroshi ^[2]; Fak, B ^[3]; Ollivier, J ^[4]; Yamazaki, Teruo ^[5]; Saito, Tomonori ^[2]; Yoshizawa, H. ^[5]; Shimura, Y ^[5]; Sakakibara, T ^[5]; Hong, T ^[6]; Goto, K ^[1]; Yaraskavitch, L ^[7]; Kycia, J ^[7]

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1. Tokyo Metropolitan University, Hachioji-shi TOKYO
2. ORNL
3. SPSMS, UMR-E CEA/UJF-Grenoble-1, INAC, F-38054 Grenoble Cedex 9 FRANCE
4. Institute Laue Langevin, Boite Postale 156, Grenoble, FRANCE
5. University of Tokyo, Japan
6. Oak Ridge National Laboratory (ORNL)
7. University of Waterloo, Canada

Low-temperature states of polycrystalline samples of a frustrated pyrochlore oxide Tb2+xTi2 xO7+y have been investigated by specific heat, magnetic susceptibility, and neutron scattering experiments. We have found that this system can be tuned by a minute change of x from a spin-liquid state (x < xc) to a partly ordered state with a small antiferromagnetic ordering of the order of 0.1 B. Specific heat shows a sharp peak at a phase transition at Tc = 0.5 K for x = 0.005. Magnetic excitation spectra for this sample change from a quasielastic to a gapped type through Tc. The possibility of a Jahn-Teller transition is discussed.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1096338
• Journal Information: Physical Review B, Vol. 87, Issue 6; ISSN 1098--0121
• Country of Publication: United States
• Language: English