Elastic Stress-Cooling Effect on the Electrical Resistivity of Chromium

Matsumoto, Takehiko; Mitui, Tadayasu

doi:10.1143/jpsj.25.634

Cited by 5 publications

(2 citation statements)

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“…The cubic symmetry leads to a threefold degenerate domain structure, and it is well known that Q points with equal probability along any of the three cubic axes in an unbiased crystal, resulting in an equal volumetric distribution of spatially distinct Q-domains. The degeneracy between the three domain configurations is easily lifted by a uniaxial stress 29,30 or even residual surface stress from sample preparation. 31 It is well documented 29,30 that at ambient conditions, a uniaxial stress at the level of 0.7-0.9 kg/ mm 2 ͑equivalently 0.007-0.009 GPa͒ will induce a single Q-domain state.…”

Section: Experimental Choice Of Pressure Mediamentioning

confidence: 99%

“…The degeneracy between the three domain configurations is easily lifted by a uniaxial stress 29,30 or even residual surface stress from sample preparation. 31 It is well documented 29,30 that at ambient conditions, a uniaxial stress at the level of 0.7-0.9 kg/ mm 2 ͑equivalently 0.007-0.009 GPa͒ will induce a single Q-domain state. For our high-pressure experiment on chromium, it is therefore important to observe the sample in a multiple Q-domain configuration 26,27 to rule out a uniaxially compressed sample condition.…”

Section: Experimental Choice Of Pressure Mediamentioning

confidence: 99%

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Invited Article: High-pressure techniques for condensed matter physics at low temperature

Feng

Jaramillo

Wang

et al. 2010

Review of Scientific Instruments

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Determination of the variation of the fluorescence line positions of ruby, strontium tetraborate, alexandrite, and samarium-doped yttrium aluminum garnet with pressure and temperature J. Appl. Phys. 110, 023521 (2011) Condensed matter experiments at high pressure accentuate the need for accurate pressure scales over a broad range of temperatures, as well as placing a premium on a homogeneous pressure environment. However, challenges remain in diamond anvil cell technology, including both the quality of various pressure transmitting media and the accuracy of secondary pressure scales at low temperature. We directly calibrate the ruby fluorescence R1 line shift with pressure at T = 4.5 K using high-resolution x-ray powder diffraction measurements of the silver lattice constant and its known equation of state up to P = 16 GPa. Our results reveal a ruby pressure scale at low temperatures that differs by 6% from the best available ruby scale at room T. We also use ruby fluorescence to characterize the pressure inhomogeneity and anisotropy in two representative and commonly used pressure media, helium and methanol:ethanol 4:1, under the same preparation conditions for pressures up to 20 GPa at T = 5 K. Contrary to the accepted wisdom, both media show equal levels of pressure inhomogeneity measured over the same area, with a consistent ⌬P / P per unit area of Ϯ1.8 % / ͑10 4 m 2 ͒ from 0 to 20 GPa. The helium medium shows an essentially constant deviatoric stress of 0.021Ϯ 0.011 GPa up to 16 GPa, while the methanol:ethanol mixture shows a similar level of anisotropy up to 10 GPa, above which the anisotropy increases. The quality of both pressure media is further examined under the more stringent requirements of single crystal x-ray diffraction at cryogenic temperature. For such experiments we conclude that the ratio of sample-to-pressure chamber volume is a critical parameter in maintaining sample quality at high pressure, and may affect the choice of pressure medium.

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