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HIGH PRESSURE STUDY ON SOME UNUSUAL ...

WU, MAW-KUEN.

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HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS.

Record Type:	Electronic resources : Monograph/item
Title/Author:	HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS./
Author:	WU, MAW-KUEN.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1982,
Description:	161 p.
Notes:	Source: Dissertations Abstracts International, Volume: 43-07, Section: B.
Contained By:	Dissertations Abstracts International43-07B.
Subject:	Condensation. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8300740
ISBN:	9798661836878

HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS.
WU, MAW-KUEN.

HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS. - Ann Arbor : ProQuest Dissertations & Theses, 1982 - 161 p.

Source: Dissertations Abstracts International, Volume: 43-07, Section: B.

Thesis (Ph.D.)--University of Houston, 1982.

This item must not be sold to any third party vendors.

A series of high pressure studies on several different and yet related materials with unusual magnetic and superconducting properties are made. The results suggest that (1) the competition among different interactions in a single system dictates the observed physical phenomena, and (2) novel superconducting mechanism may exist in some unusual superconducting materials. These are exemplified by the following compound or alloy systems: (1) From the study on the random magnetic alloys, we propose that the paramagnetic (--->) ferromagnetic (--->) spin-glass transition observed in several alloys on cooling is due to the delicate balance among the ferromagnetic, antiferromagnetic and a third unknown freezing mechanism present in the systems. And in a two stage process, the balance between the ferromagnetic interaction and the antiferromagnetic interaction determines the appearance or the disappearance of the ferromagnetic order, while the freezing mechanism causes the spins to freeze randomly and the formation of spin-glass state. (2) The Chevrel phase ternary Ce(,1.2)Mo(,6)S(,8) is found to behave like a dilute Kondo system, in spite of the large concentration of the Ce-atom locate periodically in the lattice. The results also show that the magnetic behavior in this compound is determined by the competition between an antiferromagnetic state and a Kondo state and the system can be treated as a Kondo lattice system. (3) The high pressure effects on the itinerant ferromagnets TiBe(,2-x)Cu(,x) and ZrZn(,2) compounds are found to be in agreement with the idea proposed by Enz and Matthias that the magnetism in these compounds originate from the electron-phonon interaction, which is also responsible for the superconductivity observed in the constituent elements. However, the predicted appearance of the p-pairing superconductivity after the complete suppression of magnetism is not found in the study. (4) The pressure-induced superconductivity observed in the Chevrel ternaries Eu(,1.2)Mo(,6)S(,8) and BaMo(,6)S(,8) is rather intriguing. The non-monotonic variations of the superconducting signal and the superconducting transition temperature with pressure, and the non-bulk superconductivity suggest that the superconductivity observed may be due to some non-conventional superconducting mechanism. Based on the experimental data, the interface superconductivity is proposed as a plausible candidate. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI.

ISBN: 9798661836878Subjects--Topical Terms:

942542
Condensation.

HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS.
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245 1 0 $a HIGH PRESSURE STUDY ON SOME UNUSUAL MAGNETIC AND SUPERCONDUCTING MATERIALS.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1982
300 $a 161 p.
500 $a Source: Dissertations Abstracts International, Volume: 43-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--University of Houston, 1982.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a A series of high pressure studies on several different and yet related materials with unusual magnetic and superconducting properties are made. The results suggest that (1) the competition among different interactions in a single system dictates the observed physical phenomena, and (2) novel superconducting mechanism may exist in some unusual superconducting materials. These are exemplified by the following compound or alloy systems: (1) From the study on the random magnetic alloys, we propose that the paramagnetic (--->) ferromagnetic (--->) spin-glass transition observed in several alloys on cooling is due to the delicate balance among the ferromagnetic, antiferromagnetic and a third unknown freezing mechanism present in the systems. And in a two stage process, the balance between the ferromagnetic interaction and the antiferromagnetic interaction determines the appearance or the disappearance of the ferromagnetic order, while the freezing mechanism causes the spins to freeze randomly and the formation of spin-glass state. (2) The Chevrel phase ternary Ce(,1.2)Mo(,6)S(,8) is found to behave like a dilute Kondo system, in spite of the large concentration of the Ce-atom locate periodically in the lattice. The results also show that the magnetic behavior in this compound is determined by the competition between an antiferromagnetic state and a Kondo state and the system can be treated as a Kondo lattice system. (3) The high pressure effects on the itinerant ferromagnets TiBe(,2-x)Cu(,x) and ZrZn(,2) compounds are found to be in agreement with the idea proposed by Enz and Matthias that the magnetism in these compounds originate from the electron-phonon interaction, which is also responsible for the superconductivity observed in the constituent elements. However, the predicted appearance of the p-pairing superconductivity after the complete suppression of magnetism is not found in the study. (4) The pressure-induced superconductivity observed in the Chevrel ternaries Eu(,1.2)Mo(,6)S(,8) and BaMo(,6)S(,8) is rather intriguing. The non-monotonic variations of the superconducting signal and the superconducting transition temperature with pressure, and the non-bulk superconductivity suggest that the superconductivity observed may be due to some non-conventional superconducting mechanism. Based on the experimental data, the interface superconductivity is proposed as a plausible candidate. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI.
590 $a School code: 0087.
650 4 $a Condensation. $3 942542
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710 2 $a University of Houston. $3 1019266
773 0 $t Dissertations Abstracts International $g 43-07B.
790 $a 0087
791 $a Ph.D.
792 $a 1982
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8300740