Cheng J-G, Sui Y, Zhou J-S, Goodenough J B, Su W H
Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China.
Phys Rev Lett. 2008 Aug 22;101(8):087205. doi: 10.1103/PhysRevLett.101.087205. Epub 2008 Aug 21.
Following the same strategy used for RVO3, thermal conductivity measurements have been made on a series of single-crystal perovskites RTiO3 (R=La,Nd,...,Yb). Results reveal explicitly a transition from an orbital liquid to an orbitally ordered phase at a magnetic transition temperature, which is common for both the antiferromagnetic and ferromagnetic phases in the phase diagram of RTiO3. This spin/orbital transition is consistent with the mode softening at T_{N} in antiferromagnetic LaTiO3 and is supported by an anomalous critical behavior at T_{c} in ferromagnetic YTiO3.
遵循用于RVO3的相同策略，对一系列单晶钙钛矿RTiO3（R = La、Nd、...、Yb）进行了热导率测量。结果明确显示，在磁转变温度下，从轨道液体到轨道有序相的转变，这在RTiO3相图中的反铁磁相和铁磁相中都是常见的。这种自旋/轨道转变与反铁磁LaTiO3中TN处的模式软化一致，并得到铁磁YTiO3中Tc处异常临界行为的支持。
