SCIENTIFIC ABSTRACT PONOMAREV, YA. G. - POPCHENKOV, I. N.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R002202510016-2
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: August 9, 2001
• Sequence Number: 16
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

T' 7 6 3 1
-0 Ncvembur
ABSTRACTS OF REPORTS PRESENTED AT THE. FIRST ALL-UNIO.'!
CONFERENCE. ON METAL-DIELEECTRIC PiViz-c- TRANSITIONS
Excerpts from Russian-languagc: book, Sbcrn", Krat~lkh
r1okladov lre~31~%Ien ykh N. I Vse,,.,uznUvu
Ferethc a 'g~ -
-A~ T-:;'M~nccs U
To F-fri 15 2. .5,~Z
Mry ol Higher and Sec~;nar; cialized Education
Moskovskogo Universiteta, Mfoscow, pp 8-10, 10-1Z, 15-17, 18-23.
CONTENTS PACE
7.
Metal- Die We tric Phase Transitions of BISb Alloys in Strong Magnetic
Fields
71~-
(H.B. Brandt, Ye. A. Svi rtova),. .........
1.M. Lif.hitsl Metal-DialectrIc llha3e Tr4nsitioms In Alloys
Under the Influence of Prowsurn
(N.B. Brandt, et al. )................... ......... .......... 3
On Instability of Two-Zono Modol of Metal Ralati%-a to A--nibilation
ScattorLn$
(Do chan Kat, Yu V. Kopayev) .................................
Light Absorption in V,03
(G. 0. AndriaRov, et al.) ............... .................... 7

TPRS 57631~
3 C?
METAL-ME.WICTRIC PHASE TrUNNSITICYNS Oil BiSb ALL40YS IN ST11ONr, FIEV)s
(Article by N. H. Brandt, Vt. A. Svistoyaj Moscow State Uz1--*vCrf4xY, Physics
nepartment,
Presented In this paper are the results of, a study of' thr rna"~,ti-z
rcsistan~v of sperlmt~ns with sz-all-cantrolled Trrarlapplitg ef =Cne,; -1.nd
c0ntVollcd G1Vrej1':il.-t, i-0-, of metallic and s"jconductor all01-s of
bismuth anJ antimony in which the antimony concentrations vary up to 221.,
in pulsed magnetic fields up to 700 ke in the Z-77'r tcmperatvra range,
the purpose nf which was to discover effects Telatnd to q=li-.n%Ivo thanges
In the energy sp"ttultz of the specimens In the ult-raquantum: of
magnetic fields.
Quantizarkiln ~f carrier exier;y
and tile spin distribution of the
energy levels in the cagnetic fiVW
me of
lead to displace nt . ilic V,6 7darie,
u
of the energy zor=-(~'Igurc 1).
In the UItT,*kqU=tU3z reZio.1
the displacement of --cne boundaries.
(4) reaches a ma;nitu,:+ comparuzI-c
to or greater then the Fer;%L enerV
in the 6-oncs of the =etais or the
slit in semiconjuc_
energy 'Drs. Here
electron transitions.may occur, depending on the ratio of the spin and
orbital massas of the carriers.
A

concentration of current carricrs
increase. When 11 > 11 the c1larzerer
of Jisplacoment of zone houndaric!;
changes qualitativoly: the extrct":-
---------- T continues to descc-nd, but -zliom
the extremum ~, begin5 to risu.
Consequently overlapping of zuncs
L and T vanishes when It ~ if ;Lid
an energy slit is formed when
11 > Ilk' , whereup, on the metal bocom,2s
Figure 5. a semiconductor.
The exponential increase of =agaetlc resistance for it ', 1`111
a pearanco of of electrical resistance on
P
temperature when H > H k" dependence of' field iij on the composition of tlh~?
alloy (magnitude of zone overlapping when Ii - 0) indicate that =ono over-
, slit
lapping in the energy spectrum vanishcs,in field I
tind an anjvy~
appears when H >11 Then metallic BiY'J alloys &o into the
k,
state.
Also observed in tho work,lz the transition of 4 semiconductor into
the slitless stdta. This ty-oo of transition is a consequence of convorgence
and subsequent divergence of the is and I a axtrona, located at the- s=o
point of the phase space. If the substzact Is a seniccnductor -hen It - 0,
then because of convergence of the oxtreu the semiconductor goes into a
unique slitless state, rharacteriz" by an anomalously-small energy slit
between the zones and by increased conductivity.
More conplex transitions, related to the,motion of seAral different
extrema. were also observed in the work.
1. H. LIFSHITS' METAL-DILLECTRIC PIMEE TWSITIQNS IN III "Ipx ALLOYS U%,DLA
THE INVIXENCE OF PRESSURE
(Article by N 8 Randt,
S.
- H, Chudin-o N. Y*stie-bava' M03 tate University, Physics DIpArt-
ment. pp
I,.17h,'!,sccond and fifth o7der phase transitions predicted by
co 1. ". 1.1 hi ,, which occur in 111 1-1 Sox alloys under the infNance of
pressure, are analyted. The Shubnik oscillations of longitudinal and
transverse mapTictic resistances in fields 0 < H < 70 ke and th~r galvano-
c ma patic tensor component (for the case urt