Strong sensitivity to magnetic field of the low-temperature heat capacity of (TMTSF)2PF6

2002 ◽  
Vol 12 (9) ◽  
pp. 27-29
Author(s):  
J. C. Lasjaunias ◽  
S. Sahling ◽  
K. Biljakovic ◽  
P. Monceau
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Ground State ◽  
Crystal Orientation ◽  
Density Wave ◽  
Spin Density Wave ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity ◽  
Low Temperature Specific Heat ◽  
Low Magnetic Field

We have observed a very large sensitivity to low magnetic field (i.e. below 0.5 Tesla) of the low-temperature specific heat Cp of the quasi-1D compound (TMTSF)2PF6 in its spin-density wave (SDW) ground state. This effect is independent on the field direction compared to that of the crystal orientation (with H || either to $\bf a$ or $\bf b'$ axis), and hence does not seem to be related in a direct way to the electronic SDW itself. In addition, we did not detect any feature in Cp at the spin-flop transition (at $H=0.45$ T, || $\bf b'$ axis).

scholarly journals MAGNETIC FIELD TUNING OF CHARGE AND SPIN ORDER IN THE CUPRATE SUPERCONDUCTORS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3156-3163 ◽  
Author(s):  
A. POLKOVNIKOV ◽  
S. SACHDEV ◽  
M. VOJTA ◽  
E. DEMLER
Keyword(s):  
Magnetic Field ◽  
Ground State ◽  
Charge Density Wave ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Spin Density Wave ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Spin Order ◽  
New Information

Recent neutron scattering, nuclear magnetic resonance, and scanning tunneling microscopy experiments have yielded valuable new information on the interplay between charge and spin density wave order and superconductivity in the cuprate superconductors, by using a perpendicular magnetic field to tune the ground state properties. We compare the results of these experiments with the predictions of a theory which assumed that the ordinary superconductor was proximate to a quantum transition to a superconductor with co-existing spin/charge density wave order.

scholarly journals Linear magnetoresistance in the low-field limit in density-wave materials

2019 ◽  
Vol 116 (23) ◽  
pp. 11201-11206 ◽  
Author(s):  
Yejun Feng ◽  
Yishu Wang ◽  
D. M. Silevitch ◽  
J.-Q. Yan ◽  
Riki Kobayashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Applied Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Field Limit ◽  
Fermi Surfaces ◽  
Low Field ◽  
Metallic Charge ◽  
Linear Magnetoresistance

The magnetoresistance (MR) of a material is typically insensitive to reversing the applied field direction and varies quadratically with magnetic field in the low-field limit. Quantum effects, unusual topological band structures, and inhomogeneities that lead to wandering current paths can induce a cross-over from quadratic to linear MR with increasing magnetic field. Here we explore a series of metallic charge- and spin-density-wave systems that exhibit extremely large positive linear MR. By contrast to other linear MR mechanisms, this effect remains robust down to miniscule magnetic fields of tens of Oersted at low temperature. We frame an explanation of this phenomenon in a semiclassical narrative for a broad category of materials with partially gapped Fermi surfaces due to density waves.

Low Temperature Magnetotransport Properties of Polycrystalline Ca3Co4O9

MRS Advances ◽  
2017 ◽  
Vol 2 (23) ◽  
pp. 1237-1242
Author(s):  
David J. Magginetti ◽  
Shrikant Saini ◽  
Ashutosh Tiwari
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Band Structure ◽  
Density Wave ◽  
Spin Density Wave ◽  
Significant Component ◽  
Resistivity Measurements ◽  
Metal To Insulator Transition ◽  
Conventional Behavior ◽  
Physical Features

ABSTRACTCa3Co4O9 (CCO) is a promising material for thermoelectric applications; however, this layered oxide shows a large number of physical features that complicate understanding and systematically improving its properties. A significant component of CCO’s behavior is its magnetotransport properties, particularly in the low temperature region where an incommensurate spin density wave affects its band structure. In order to improve understanding in this area, we perform low temperature magnetoresistance (MR) measurements on a bulk CCO sample. Field-less resistivity measurements confirm the conventional behavior of our sample, with a metal-to-insulator transition at approximately 70 K, and a shoulder indicating ferrimagnetism at 14 K. Resistivity vs. temperature under applied magnetic field show significant MR below around 35 K.

NOVEL VORTEX STRIPE PHASE UNDER STRONG MAGNETIC FIELD IN HIGH TEMPERATURE SUPERCONDUCTORS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 9-12 ◽  
Author(s):  
YAN CHEN ◽  
Z. D. WANG ◽  
C. S. TING
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Low Temperature ◽  
Vortex Structure ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Spin Density Wave ◽  
Upper Critical Field ◽  
Stripe Phase ◽  
Stripe Phases

The nature of vortex structure in the mixed state of high-temperature superconductors (HTS) is investigated by solving the Bogoliubov-de Gennes equations with consideration of competition between antiferromagnetic (AF) and d-wave superconductivity (DSC) orders. By varying the applied magnetic field and temperature, the geometry of vortex structure can take two different forms: conventional vortex lattice (triangular or square), or vortex stripe phases where all the order parameters including spin density wave, charge density wave and superconducting order exhibit stripe-like behavior. This novel vortex stripe phases may show up at low temperature and adjacent to upper critical field H c2 Phase diagram of temperature dependence of H c2 will be presented. Our results may shed light on the understanding of the low-temperature H c2 anomalies in some HTS. New experiments are proposed to test our predictions.

Magnetic field influence on the low-temperature heat capacity of the CDW compound blue bronze

2005 ◽  
Vol 290-291 ◽  
pp. 989-992 ◽  
Author(s):  
J.C. Lasjaunias ◽  
S. Sahling ◽  
K. Biljakovic ◽  
P. Monceau ◽  
J. Marcus
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Low Temperature ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity ◽  
Blue Bronze ◽  
Field Influence
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