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Johannsen, N.*; Vasiliev, A.*; Osawa, Akira; Tanaka, Hidekazu*; Lorenz, T.*
Physical Review Letters, 95(1), p.017205_1 - 017205_4, 2005/07
Times Cited Count：23 Percentile：71.28(Physics, Multidisciplinary)We present high-resolution measurements of the thermal expansion and the magnetostriction of TlCuCl
which shows field-induced antiferromagnetic order. We find pronounced anomalies in the field and temperature dependence of different directions of the lattice signaling a large magnetoelastic coupling. The phase boundary is extremely sensitive to pressure, e.g. the transition field would change by about 
185%/GPa under uniaxial pressure applied along certain directions. This drastic effect can unambiguously be traced back to changes of the intradimer coupling under uniaxial pressure. The interdimer couplings remain essentially unchanged under pressure, but strongly change when Tl is replaced by K.
Kolezhuk, A. K.*; Glazkov, V. N.*; Tanaka, Hidekazu*; Osawa, Akira
Physical Review B, 70(2), p.020403_1 - 020403_4, 2004/07
Times Cited Count：44 Percentile：83.54(Materials Science, Multidisciplinary)Recently measured high-field ESR spectra of the spin dimer material TlCuCl are described within the framework of an effective field theory. A good agreement between the theory and experiment is achieved, for all geometries and in a wide field range, under the assumption of a weak anisotropy of the interdimer as well as intradimer exchange interaction.
