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Low-temperature spin Seebeck effect in nonmagnetic vanadium dioxide

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [3];  [2];  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Univ. of California, San Diego, CA (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
+ Show Author Affiliations
The spin Seebeck effect (SSE) is sensitive to thermally driven magnetic excitations in magnetic insulators. Vanadium dioxide in its insulating low-temperature phase is expected to lack magnetic degrees of freedom, as vanadium atoms are thought to form singlets upon dimerization of the vanadium chains. Instead, we find a paramagnetic SSE response in V⁢O2 films that grows as the temperature decreases below 50 K. The field and temperature-dependent SSE voltage is qualitatively consistent with a general model of paramagnetic SSE response and inconsistent with triplet spin transport. Quantitative estimates find a spin Seebeck coefficient comparable in magnitude to that observed in strongly magnetic materials. Finally, the microscopic nature of the magnetic excitations in V⁢O2 requires further examination.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-06CH11357; FG02-06ER46337; FG02-87ER45332
OSTI ID:
2544216
Alternate ID(s):
OSTI ID: 2473791
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 110; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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