You need JavaScript to view this

Nuclear magnetic ordering in copper and silver at nano- and picokelvin temperatures

Conference:

Abstract

In this one page document recent experiments on spontaneous nuclear magnetic ordering in copper and silver are discussed. In copper, below the critical field of 250 microTesla earlier susceptibility measurements had revealed three antiferromagnetic phases at spin temperatures below 60 nanoKelvin. The experimental results for the phase diagram and the ordered spin structures are in excellent agreement with experiment. In silver, the spin-spin interactions are dominated by exchange forces, and therefore this material is an ideal model for a spin one-half Heisenberg system in an fcc lattice. Experimentally, the critical magnetic field is 80 microTesla and anitferromagnetic order was found by susceptibility measurements below 560 picoKelvin. The record lowest temperature produced was 500 picoKelvin. The field versus entropy diagram of silver shows a single ordered phase. By rapid field reversal the silver nuclei have been cooled to negative spin temperatures. The reality of spin temperatures, both positive and negative, have been clearly demonstrated by these experiments. 2 refs.
Authors:
Lounasmaa, O V [1] 
  1. Helsinki Univ. of Technology, Espoo (Finland). Low Temperature Lab.
Publication Date:
Dec 31, 1993
Product Type:
Conference
Report Number:
CONF-9105440-
Reference Number:
SCA: 661210; PA: AIX-26:064240; EDB-95:132227; SN: 95001458284
Resource Relation:
Conference: Kathmandu summer school on current topics in condensed matter and particle physics. Non-perturbative phenomena and strongly correlated systems, Kathmandu (Nepal), 19 May - 1 Jun 1991; Other Information: PBD: 1993; Related Information: Is Part Of Current topics in condensed matter and particle physics. Non-perturbative phenomena and strongly correlated systems. Kathmandu summer school lecture notes. V. 2; Pati, J. [ed.] [Maryland Univ., College Park, MD (United States)]; Shafi, Q. [ed.] [Delaware Univ., Newark, DE (United States)]; Yu Lu [ed.] [International Centre for Theoretical Physics, Trieste (Italy)]; PB: 648 p.
Subject:
66 PHYSICS; COPPER; NUCLEAR MAGNETISM; SILVER; ADIABATIC DEMAGNETIZATION; ANTIFERROMAGNETISM; SPIN; TEMPERATURE RANGE 0000-0013 K
OSTI ID:
101011
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISBN 981-02-1376-X; TRN: XA9539696064240
Submitting Site:
INIS
Size:
pp. 433
Announcement Date:
Jan 16, 2004

Conference:

Citation Formats

Lounasmaa, O V. Nuclear magnetic ordering in copper and silver at nano- and picokelvin temperatures. IAEA: N. p., 1993. Web.
Lounasmaa, O V. Nuclear magnetic ordering in copper and silver at nano- and picokelvin temperatures. IAEA.
Lounasmaa, O V. 1993. "Nuclear magnetic ordering in copper and silver at nano- and picokelvin temperatures." IAEA.
@misc{etde_101011,
title = {Nuclear magnetic ordering in copper and silver at nano- and picokelvin temperatures}
author = {Lounasmaa, O V}
abstractNote = {In this one page document recent experiments on spontaneous nuclear magnetic ordering in copper and silver are discussed. In copper, below the critical field of 250 microTesla earlier susceptibility measurements had revealed three antiferromagnetic phases at spin temperatures below 60 nanoKelvin. The experimental results for the phase diagram and the ordered spin structures are in excellent agreement with experiment. In silver, the spin-spin interactions are dominated by exchange forces, and therefore this material is an ideal model for a spin one-half Heisenberg system in an fcc lattice. Experimentally, the critical magnetic field is 80 microTesla and anitferromagnetic order was found by susceptibility measurements below 560 picoKelvin. The record lowest temperature produced was 500 picoKelvin. The field versus entropy diagram of silver shows a single ordered phase. By rapid field reversal the silver nuclei have been cooled to negative spin temperatures. The reality of spin temperatures, both positive and negative, have been clearly demonstrated by these experiments. 2 refs.}
place = {IAEA}
year = {1993}
month = {Dec}
}