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Pressure dependence of the magnetic ground state in CePtSi 2

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [2];  [3];  [3];  [3];  [4];  [5];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Rochester, NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Niigata Univ. (Japan)
  4. Kyushu Univ., Fukuoka (Japan)
  5. Univ. of Tokyo (Japan)
+ Show Author Affiliations

CePtSi2 was reported to exhibit an antiferromagnetic order below T*=1.8 K at ambient pressure, a valence state change at ~1.2 GPa, and superconductivity in the range between 1.4 and 2.1 GPa with a maximum transition temperature of 0.14 K [T. Nakano et al., Phys. Rev. B 79, 172507 (2009)]. We have performed polycrystalline and single-crystal neutron diffraction experiments to determine the magnetic structure under ambient and high pressures. We found incommensurate magnetic peaks with a magnetic propagation vector of (0.32,0,0.11) at ambient pressure below TSDW ~ 1.25 K. Those magnetic peaks originate from a spin-density-wave order with the easy axis along the c axis and an averaged ordered moment of 0.45(5)μB, suggesting that there may be an intermediate phase between T* and TSDW. Applying pressures, the magnetic propagation vector shows no change and the magnetic order disappears around 1.0 GPa, which is much lower than the critical pressure for the superconducting phase. The results suggest that other than magnetic fluctuations may play a primary role in the superconducting pairing mechanism.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S.-Japan Cooperative Program; Ministry of Education, Culture, Sports, Science and Technology (MEXT)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1872866
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
antiferromagnetism
heavy-fermion systems
magnetic order
magnetism
neutron diffraction
neutron techniques
order parameters
phase transitions
pressure techniques
strongly correlated systems
superconductivity