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Multiferroic quantum criticality in a (Eu,Ba,Sr)TiO3 solid solution
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DOI：10.1103/PhysRevB.109.214109.png)
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Abstract
En 中文
Based on the earlier published theory [A. Narayan, Nat. Mater. 18, 223 (2019)], a comprehensive experimental investigation of multiferroic quantum critical behavior of (Eu,Ba,Sr)TiO3 polycrystalline and single-crystal samples was performed. The presence of the displacive ferroelectric quantum criticality is revealed through nonclassical (T-2) temperature scaling of inverse dielectric susceptibility up to 60 K. With increasing hydrostatic pressure, this ferroelectric quantum criticality is gradually suppressed. Inverse magnetic susceptibility follows classical Curie-Weiss law down to 4 K, but quantum fluctuations belonging to an antiferromagnetic phase transition (T-N < 0.8 K) change its scaling below 3 K to T( (1.7 +/- 0.1) )and T ((2.1 +/- 0.2)) for samples containing 29% and 25% of Eu2+ ions, respectively. Experimental indications of the coexisting ferroelectric and antiferromagnetic, i.e., multiferroic, quantum fluctuations and qualitative explanation of why they could be seen only in the immediate proximity of T-N is given.
Keywords:
CRITICAL-BEHAVIOR
PHASE-TRANSITION
DIELECTRIC-PROPERTIES
SINGLE-CRYSTAL
SRTIO3
SUPERCONDUCTIVITY
Journal
IF:
3.7
Papers:
15.4W
Citations:
41.0W