期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.185701
关键词
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资金
- KAKENHI, MEXT of Japan
- Japan Society for the Promotion of Science (JSPS)
- Hungarian Research Funds OTKA [PD75615, CNK80991, K73361, K101244]
- Bolyai program [TAMOP-4.2.2.B-10/1-2010-0009]
- NSF [DMR-0906566]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906566] Funding Source: National Science Foundation
The subtle interplay of randomness and quantum fluctuations at low temperatures gives rise to a plethora of unconventional phenomena in systems ranging from quantum magnets and correlated electron materials to ultracold atomic gases. Particularly strong disorder effects have been predicted to occur at zero-temperature quantum phase transitions. Here, we demonstrate that the composition-driven ferromagnetic-to-paramagnetic quantum phase transition in Sr1-xCaxRuO3 is completely destroyed by the disorder introduced via the different ionic radii of the randomly distributed Sr and Ca ions. Using a magneto-optical technique, we map the magnetic phase diagram in the composition-temperature space. We find that the ferromagnetic phase is significantly extended by the disorder and develops a pronounced tail over a broad range of the composition x. These findings are explained by a microscopic model of smeared quantum phase transitions in itinerant magnets. Moreover, our theoretical study implies that correlated disorder is even more powerful in promoting ferromagnetism than random disorder.
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