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Title: Quantum criticality and entropy transfer in spin chains and planes—Pyridine oxide copper salts

Journal Article · · AIP Advances
DOI: https://doi.org/10.1063/1.5130403 · OSTI ID:1803172
 [1];  [2]; ORCiD logo [2];  [3];  [3]; ORCiD logo [2]
  1. Univ. of California, Santa Cruz, CA (United States). Physics Dept.; OSTI
  2. Univ. of California, Santa Cruz, CA (United States). Physics Dept.
  3. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemistry
+ Show Author Affiliations

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.

Research Organization:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0017862
OSTI ID:
1803172
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 12 Vol. 9; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (17)

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36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Entropy
Jahn-Teller distortion
Magnetic fields
Phase transitions
Quantum coherence
Thermodynamic properties