TY - JOUR
T1 - Heat capacity reveals the physics of a frustrated spin tube
AU - Ivanov, Nedko B.
AU - Schnack, Jürgen
AU - Schnalle, Roman
AU - Richter, Johannes
AU - Kögerler, Paul
AU - Newton, Graham N.
AU - Cronin, Leroy
AU - Oshima, Yugo
AU - Nojiri, Hiroyuki
PY - 2010/7/16
Y1 - 2010/7/16
N2 - We report on theoretical and experimental results concerning the low-temperature specific heat of the frustrated spin-tube material [(CuCl2tachH)3Cl]Cl2 (tach denotes 1,3,5-triaminocyclohexane). This substance turns out to be an unusually perfect spin-tube system which allows to study the physics of quasi-one-dimensional antiferromagnetic structures in rather general terms. An analysis of the specific-heat data demonstrates that at low enough temperatures the system exhibits a Tomonaga-Luttinger liquid behavior corresponding to an effective spin-3/2 antiferromagnetic Heisenberg chain with short-range exchange interactions. On the other hand, around 2 K the composite spin structure of the chain is revealed through a Schottky-type peak in the specific heat. We argue that the dominating contribution to the peak originates from gapped magnon-type excitations related to the internal degrees of freedom of the rung spins.
AB - We report on theoretical and experimental results concerning the low-temperature specific heat of the frustrated spin-tube material [(CuCl2tachH)3Cl]Cl2 (tach denotes 1,3,5-triaminocyclohexane). This substance turns out to be an unusually perfect spin-tube system which allows to study the physics of quasi-one-dimensional antiferromagnetic structures in rather general terms. An analysis of the specific-heat data demonstrates that at low enough temperatures the system exhibits a Tomonaga-Luttinger liquid behavior corresponding to an effective spin-3/2 antiferromagnetic Heisenberg chain with short-range exchange interactions. On the other hand, around 2 K the composite spin structure of the chain is revealed through a Schottky-type peak in the specific heat. We argue that the dominating contribution to the peak originates from gapped magnon-type excitations related to the internal degrees of freedom of the rung spins.
UR - http://www.scopus.com/inward/record.url?scp=77954823881&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954823881&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.105.037206
DO - 10.1103/PhysRevLett.105.037206
M3 - Article
AN - SCOPUS:77954823881
SN - 0031-9007
VL - 105
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 037206
ER -