Cubic Laves ferromagnetTbNi2Mninvestigated through ambient-pressure magnetization and specific heat and high pressure ac magnetic susceptibility

2007 ◽  
Vol 75 (22) ◽  
Author(s):  
D. D. Jackson ◽  
S. K. McCall ◽  
S. T. Weir ◽  
A. B. Karki ◽  
D. P. Young ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Specific Heat ◽  
Ambient Pressure ◽  
Ac Magnetic Susceptibility

Low-temperature Properties of U2Co2InH1.9

2007 ◽  
Vol 62 (7) ◽  
pp. 977-981 ◽  
Author(s):  
Ladislav Havela ◽  
Khrystyna Miliyanchuk ◽  
Laura C. J. Pereira ◽  
Eva Šantavá
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Specific Heat ◽  
Low Temperatures ◽  
Magnetic Order ◽  
Parent Compound ◽  
Spin Fluctuations ◽  
High Magnetic Fields ◽  
Electronic Specific Heat ◽  
Metamagnetic Transition

Abstract U2Co2InH1.9, synthesized by high-pressure hydrogenation of U2Co2In, crystallizes in the tetragonal structure similar to the parent compound, expanded by 8.4 %. Although U2Co2In is a weak paramagnet, its hydride shows properties suggesting a proximity to the magnetic order. Its magnetic susceptibility exhibits a maximum at T = 2.4 K, ascribed to spin fluctuations. Magnetization at low temperatures goes through a metamagnetic transition between 2 - 3 T. The specific heat characteristics, with a pronounced upturn of Cp/T vs. T at low temperatures which can be fitted using an additional −T 1/2 term, resemble the behaviour of U2Co2Sn. The γ coefficient of the electronic specific heat, reaching 244 mJ mol−1 K−2, is gradually suppressed by high magnetic fields.

Specific heat and AC magnetic susceptibility of the alkali-metal iron antimonides (Na,K)Fe4Sb12 and BaFe4Sb12

2004 ◽  
Vol 272-276 ◽  
pp. 835-836 ◽  
Author(s):  
N. Senthilkumaran ◽  
M. Baenitz ◽  
A. Leithe-Jasper ◽  
W. Schnelle ◽  
A. Rabis ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Alkali Metal ◽  
Specific Heat ◽  
Ac Magnetic Susceptibility

DC Magnetic Susceptibility of CeCoGe2.36Si0.64 under High Pressure

2012 ◽  
Vol 190 ◽  
pp. 405-408
Author(s):  
J.J. Larrea ◽  
J. Teyssier ◽  
H. Ronnow ◽  
M. Müller ◽  
A. Sidorenko ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Heavy Fermion ◽  
Pressure Range ◽  
Magnetic Phase ◽  
Ambient Pressure ◽  
Quantum Critical Point ◽  
Magnetic Phase Diagram ◽  
Antiferromagnetic Order

We report an investigation of the magnetic phase diagram of the heavy fermion com-pound CeCoGe2.36Si0.64 using DC magnetic susceptibility measurements under high pressure upto 10 kbar. The antiferromagnetic order that develops at ambient pressure below about 5.5 Kremains essentially unaffected by pressure in the investigated pressure range up to 10 kbar. Onthe other hand, moderate magnetic fields appear to induce a quantum critical point in a sam-ple subject to a pressure of 2 kbar. We discuss the role of disorder in the series of compoundsCeCoGe3−xSix.

scholarly journals Incompatibility of Published ac Magnetic Susceptibility of a Room Temperature Superconductor with Measured Raw Data

2021 ◽  
Author(s):  
J. E. Hirsch
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Superconducting Transition ◽  
Ac Magnetic Susceptibility ◽  
Raw Data ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Room Temperature Superconductivity

Room temperature superconductivity has recently been reported for a carbonaceous sulfur hydride (CSH) under high pressure by Snider et al [1]. The paper reports sharp drops in magnetic susceptibility as a function of temperature for five different pressures, that are interpreted as signaling a superconducting transition. Here I question the validity and faithfulness of the magnetic susceptibility data presented in the paper by comparison with the measured raw data reported by two of the authors of ref. [2]. This invalidates the assertion of the paper [1] that the susceptibility measurements support the case for superconductivity in this compound.

PRESSURE EFFECT ON CONDUCTIVITY IN Au(dmit)2 LANGMUIR–BLODGETT FILMS

2002 ◽  
Vol 01 (05n06) ◽  
pp. 627-630 ◽  
Author(s):  
YASUHIRO F. MIURA ◽  
SHIN-ICHI MORITA ◽  
SHIN-HACHIRO SAITO ◽  
MICHIO SUGI ◽  
MASATO HEDO ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Pressure Effect ◽  
Ambient Pressure ◽  
Superconducting Phase ◽  
Ac Magnetic Susceptibility ◽  
Temperature Resistance ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Resistance Decrease

The resistance of the Langmuir–Blodgett films of ditetradecyldimethylammonium- Au(dmit) 2( 2C 14- Au(dmit) 2) salt has been measured under hydrostatic pressure up to 0.7 GPa. The room-temperature resistance decreases with increasing pressure, reaching a 0.6-times smaller value compared to that at ambient pressure. The film under the pressure shows a clear resistance decrease below 1.4 K on cooling, while that under ambient pressure shows a blunt decrease below 0.85 K and it turns to increase below 0.65 K. These results suggest the existence of the pressure-induced superconducting phase together with the earlier results of the ac magnetic susceptibility measurement.

scholarly journals Incompatibility of Published ac Magnetic Susceptibility of a Room Temperature Superconductor with Measured Raw Data

2021 ◽  
Author(s):  
Jorge Hirsch
Keyword(s):  
High Pressure ◽  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Superconducting Transition ◽  
Ac Magnetic Susceptibility ◽  
Raw Data ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Room Temperature Superconductivity

Room temperature superconductivity has recently been reported for a carbonaceous sulfur hydride (CSH) under high pressure by Snider et al [1]. The paper reports sharp drops in magnetic susceptibility as a function of temperature for five different pressures, that are interpreted as signaling a superconducting transition. Here I question the validity and faithfulness of the magnetic susceptibility data presented in the paper by comparison with the measured raw data reported by two of the authors of ref. [2]. This casts doubt on the assertion of the paper [1] that the susceptibility measurements support the case for superconductivity in this compound.

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