1. Quantum criticality and entropy transfer in spin chains and planes—Pyridine oxide copper salts
- Author
-
Jennifer Trinh, Kevin Schlenker, Daniel Schaller, P. G. LaBarre, Joel S. Miller, and Arthur P. Ramirez
- Subjects
010302 applied physics ,Quantum phase transition ,Materials science ,Oxide ,General Physics and Astronomy ,New materials ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,lcsh:QC1-999 ,Crystallography ,chemistry.chemical_compound ,chemistry ,Criticality ,0103 physical sciences ,Pyridine ,0210 nano-technology ,Quantum ,Critical field ,lcsh:Physics - Abstract
We present magnetic field-dependent specific heat (C) data for [Cu(pyO)6](NO3)2 (pyO = pyridine oxide) (CPN), a molecular salt shown to be quasi-1D, and for a quasi-2D analogue, [Cu(pyO)6](BF4)2 (CPB). For CPN, a sharp feature indicating 3D ordering is observed at 0.16K in zero-field. As the field, H, is increased, the ordering temperature first increases, as expected for quasi-1D antiferromagnets, before decreasing rapidly for H above 3T. The field also transfers the entropy of short-range ordering (SRO) in the spin chains into the 3D ordering peak. At our lowest accessible temperature, T ∼ 0.096K, C/T exhibits an enhanced peak at the critical field. Qualitatively similar behavior is found in CPB. These results demonstrate a potentially powerful new materials route to study quantum phase transitions.
- Published
- 2019
- Full Text
- View/download PDF