Magnon excitations and quantum critical behavior of the ferromagnet U4Ru7Ge6
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10385390" target="_blank" >RIV/00216208:11320/18:10385390 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevB.98.174431" target="_blank" >https://doi.org/10.1103/PhysRevB.98.174431</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.98.174431" target="_blank" >10.1103/PhysRevB.98.174431</a>
Alternative languages
Result language
angličtina
Original language name
Magnon excitations and quantum critical behavior of the ferromagnet U4Ru7Ge6
Original language description
We present an extensive study of the ferromagnetic heavy-fermion compound U4Ru7Ge6. Measurements of electrical resistivity, specific heat, and magnetic properties show that U4Ru7Ge6 orders ferromagnetically at ambient pressure with a Curie temperature T-C = 6.8 +/- 0.3 K. The low-temperature magnetic behavior of this soft ferromagnet is dominated by the excitation of gapless spin-wave modes. Our results on the transport properties of U(4)Ru(7)Ge(6 )under pressures up to 2.49 GPa suggest that U4Ru7Ge6 has a putative ferromagnetic quantum critical point (QCP) at P-c approximate to 1.7 +/- 0.02 GPa. In the ordered phase, ferromagnetic magnons scatter the conduction electrons and give rise to a well-defined power law temperature dependence in the resistivity. The coefficient of this term is related to the spin-wave stiffness, and measurements of the very low temperature resistivity show the behavior of this quantity as the ferromagnetic QCP is approached. We find that the spin-wave stiffness decreases with increasing pressure, implying that the transition to the nonmagnetic Fermi liquid state is driven by the softening of the magnons. The observed quantum critical behavior of the magnetic stiffness is consistent with the influence of disorder in our system. At quantum criticality (P = P-c approximate to 1.7 +/- 0.02 GPa), the resistivity shows the behavior expected for an itinerant metallic system near a ferromagnetic QCP.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
<a href="/en/project/LM2011025" target="_blank" >LM2011025: MLTL - Magnetism and Low Temperature Laboratories - operation and development of national research infrastructure</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review B
ISSN
2469-9950
e-ISSN
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Volume of the periodical
98
Issue of the periodical within the volume
17
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
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UT code for WoS article
000451330200005
EID of the result in the Scopus database
2-s2.0-85057357205