Effects of Two Energy Scales in Weakly Dimerized Antiferromagnetic Quantum Spin Chains

A. Brühl, B. Wolf, V. Pashchenko +9

By means of thermal expansion and specific heat measurements on the high-pressure phase of (VO)${}_2$P${}_2$O${}_7$, the effects of two energy scales of the weakly dimerized antiferromag…