Quantum Hall Effect and Rapid Oscillations in (Tmtsf)2Pf6 under Pressure

1989 ◽  
Vol 173 ◽  
Author(s):  
S. T. Hannahs ◽  
J. S. Brooks ◽  
W. Kang ◽  
P. M. Chaikin ◽  
L. Y. Chiang ◽  
...  
Keyword(s):  
Spin Density ◽  
Quantum Hall Effect ◽  
Density Wave ◽  
Quantum Hall ◽  
Spin Density Wave ◽  
Zero Field ◽  
Conducting Plane ◽  
The Standard Model ◽  
Longitudinal Resistivity ◽  
Good Agreement

ABSTRACTWe present magnetotransport data and the phase diagram derived from them for (TMTSF)2PF6 under sufficient pressure that the zero field Spin Density Wave (SDW) is suppressed and the material is superconducting. Application of a large magnetic field perpendicular to the conducting plane then leads to the cascade of Field Induced Spin Density Wave (FISDW) transitions. The transitions are in good agreement with the Standard model for these transitions and in contrast to the more complicated behavior seen in the ClO4 salt. In addition Hall and longitudinal resistivity indicates a behavior much closer to that observed in conventional Quantum Hall devices than in the ClO4 salt or previous studies of PF6. We do observe the “rapid” Schubnikov de Haas like oscillations in magnetoresistance at high field similar to those seen in ClO4, even though in the present case there is no evidence for anion ordering as some theories would require.

Field-induced spin density wave and quantum Hall effect in (TMTSF)2X

1994 ◽  
Vol 201 ◽  
pp. 487-489
Author(s):  
K. Machida ◽  
Y. Hasegawa ◽  
M. Kohmoto ◽  
Y. Hori ◽  
K. Kishigi
Keyword(s):  
Hall Effect ◽  
Spin Density ◽  
Quantum Hall Effect ◽  
Density Wave ◽  
Quantum Hall ◽  
Spin Density Wave

Quantum Hall effect in the field-induced spin density wave states

1994 ◽  
Vol 7 (4) ◽  
pp. 757-762 ◽  
Author(s):  
Yasumasa Hasegawa ◽  
Kazushige Machida ◽  
Mahito Kohmoto ◽  
Victor M. Yakovenko
Keyword(s):  
Hall Effect ◽  
Spin Density ◽  
Quantum Hall Effect ◽  
Density Wave ◽  
Quantum Hall ◽  
Spin Density Wave ◽  
Wave States

Coexistence of superconductivity and spin density wave orderings in Bechgaard and Fabre salts

2002 ◽  
Vol 12 (9) ◽  
pp. 197-200
Author(s):  
C. Pasquier ◽  
P. Auban-Senzier ◽  
T. Vuletic ◽  
S. Tomic ◽  
M. Heritier ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Density ◽  
Critical Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Upper Critical Field ◽  
Small Range ◽  
Zero Field ◽  
Pressure Independent ◽  
Two Phases

In a small range of pressure, superconductivity (SC) and Spin Density Wave (SDW) states are shown to coexist in the Bechgaard salt (TMTSF)2PF6 and the Fabre salt (TMTTF)2BF4. In (TMTSF)2PF6, a precise investigation of the (P,T) phase diagram has led us to demonstrate the coexistence of the two phases with a superconducting critical temperature which is pressure independent while the critical current at zero field is strongly depressed as the pressure is decreased. In (TMTTF)2BF4, using non-linear transport measurements, we present the signature of the presence of 1D superconducting filaments in a small range of pressure. We also investigate the compound under a magnetic field applied along the c*-axis: the upper critical field is more or less pressure independent and is about 2 Tesla (at zero temperature). We suggest that such a high critical field is compatible with the penetration of the magnetic field in the insulating regions of the compound in a similar way of Josephson vortices in layered superconductors.

scholarly journals Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5

2017 ◽  
Vol 114 (21) ◽  
pp. 5384-5388 ◽  
Author(s):  
P. F. S. Rosa ◽  
J. Kang ◽  
Yongkang Luo ◽  
N. Wakeham ◽  
E. D. Bauer ◽  
...  
Keyword(s):  
Spin Density ◽  
Superconducting State ◽  
Heavy Fermion ◽  
Magnetic State ◽  
Applied Pressure ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Zero Field ◽  
Model Calculations

Applied pressure drives the heavy-fermion antiferromagnet CeRhIn5 toward a quantum critical point that becomes hidden by a dome of unconventional superconductivity. Magnetic fields suppress this superconducting dome, unveiling the quantum phase transition of local character. Here, we show that 5% magnetic substitution at the Ce site in CeRhIn5, either by Nd or Gd, induces a zero-field magnetic instability inside the superconducting state. This magnetic state not only should have a different ordering vector than the high-field local-moment magnetic state, but it also competes with the latter, suggesting that a spin-density-wave phase is stabilized in zero field by Nd and Gd impurities, similarly to the case of Ce0.95Nd0.05CoIn5. Supported by model calculations, we attribute this spin-density wave instability to a magnetic-impurity-driven condensation of the spin excitons that form inside the unconventional superconducting state.

Sign in / Sign up

Export Citation Format

Share Document