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Title: Low-temperature domain-wall freezing and nonequilibrium dynamics in the transverse-field Ising model material CoNb 2 O 6

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2];  [2];  [3];  [4]; ORCiD logo [5];  [6]
  1. Colorado State Univ., Fort Collins, CO (United States); OSTI
  2. Colorado State Univ., Fort Collins, CO (United States)
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  4. Johns Hopkins Univ., Baltimore, MD (United States)
  5. Univ. of Texas at El Paso, TX (United States)
  6. Colorado State Univ., Fort Collins, CO (United States); Canadian Institute for Advanced Research (CIFAR), Toronto, ON (Canada)

CoNb2O6 is a rare realization of the transverse-field Ising model, making it a useful tool for studying both equilibrium and nonequilibrium many-body quantum physics. Despite a large body of work dedicated to characterizing this material, details of the ordered states in the presence of relatively weak transverse fields have not been discussed in detail. Here, we present a detailed study of CoNb2O6 via ac susceptibility measurements in order to further characterize its low-temperature behavior in the presence of a transverse field. Specifically, we call attention to an unconventional freezing transition in zero field below TF = 1.2 K, occurring within the well-known commensurate antiferromagnetic (CAFM) state that onsets at TN2 = 1.9 K. We performed a series of transverse-field quenches into this frozen state, which resulted in a slowly relaxing susceptibility, χ' (t), that followed a logarithmic decay within the time range measured. Additionally, we discuss the frozen state in the context of the freezing of previously discussed “free” chains arising from domain walls between the four degenerate sublattices of the CAFM state. We also attempted to observe Kibble-Zurek scaling by quenching the transverse field into the frozen state at different rates. This produced a null result; the behavior can be fully explained by coarsening of domains over the time scale of the quenches. The absence of a clear Kibble-Zurek scaling is itself surprising, given the proposed ubiquity of the phenomenon for general second-order phase transitions.

Research Organization:
Colorado State Univ., Fort Collins, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018972
OSTI ID:
1979683
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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