Simultaneous measurement of shear modulus and torsional resonance of polycrystalline solid helium-4 = 다결정성 고체 헬륨의 층밀리기 탄성률과 공명 주파수 동시 측정에 관한 연구

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To understand the relation between the resonant period drop of the torsional oscillator (TO) containing the solid helium and its elastic modulus change, we simultaneously measure both phenomena using a TO by inserting concentric piezoelectric (PZT) transducer. Even we observe the similarities of the temperature, 3He concentration and frequency, remarkable discrepancy in the amplitude responses are observed. To investigate this result, we construct the perpendicularly stacked PZT transducers to measure the shear modulus in parallel to and perpendicular to the driving displacement direction. We find that our samples are composed of a few of highly oriented gains or a sufficiently small number of domains connected with a certain preferential orientation. Therefore, the discrepancies in the drive dependence of simultaneous measurement is originated from a change of an elastic property of solid helium.
Advisors
Kim, Eunseongresearcher김은성researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2016.8 ,[viii, 79 p. :]

Keywords

Solid helium; Torsional oscillator; Shear modulus; Supersolid; supfluid; 고체 헬륨; 비틀림 단진자; 층밀리기 탄성률; 초고체; 초유체

URI
http://hdl.handle.net/10203/221119
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663080&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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