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Kondo-Induced Giant Isotropic Negative Thermal Expansion

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [9];  [10];  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II) and Condensed Matter Physics and Materials Science Dept.
  2. Kent State Univ., Kent, OH (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  4. RIKEN SPring-8 Center, Sayo, Hyogo (Japan)
  5. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  6. Synchrotron SOLEIL, Gif-sur-Yvette (France); Sorbonne Univ., Paris (France)
  7. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  8. Nagoya Univ. (Japan)
  9. National Inst. for Materials Science (NIMS), Tsukuba (Japan); Univ. of Tokyo (Japan)
  10. Univ. of Connecticut, Storrs, CT (United States)
+ Show Author Affiliations

Negative thermal expansion is an unusual phenomenon appearing in only a handful of materials, but pursuit and mastery of the phenomenon holds great promise for applications across disciplines and industries. Here we report use of x-ray spectroscopy and diffraction to investigate the 4$$f$$-electronic properties in Y-doped SmS and employ the Kondo volume collapse model to interpret the results. Our measurements reveal an unparalleled decrease of the bulk Sm valence by over 20% at low temperatures in the mixed-valent golden phase, which we show is caused by a strong coupling between an emergent Kondo lattice state and a large isotropic volume change. We note the amplitude and temperature range of the negative thermal expansion appear strongly dependent on the Y concentration and the associated chemical disorder, providing control over the observed effect. This finding opens avenues for the design of Kondo lattice materials with tunable, giant, and isotropic negative thermal expansion.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Swiss National Science Foundation (SNF); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; SC0016481
OSTI ID:
1603286
Alternate ID(s):
OSTI ID: 1606583
OSTI ID: 1607709
Report Number(s):
BNL--213670-2020-JAAM; BNL--213770-2020-JAAM
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 124; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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